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linux/arch/powerpc/kvm/book3s_hv.c
Nicholas Piggin 55d7004299 KVM: PPC: Book3S HV: Reject mflags=2 (LPCR[AIL]=2) ADDR_TRANS_MODE mode 
AIL=2 mode has no known users, so is not well tested or supported.
Disallow guests from selecting this mode because it may become
deprecated in future versions of the architecture.

This policy decision is not left to QEMU because KVM support is
required for AIL=2 (when injecting interrupts).

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2019-10-22 16:29:02 +11:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
* Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
*
* Authors:
* Paul Mackerras <paulus@au1.ibm.com>
* Alexander Graf <agraf@suse.de>
* Kevin Wolf <mail@kevin-wolf.de>
*
* Description: KVM functions specific to running on Book 3S
* processors in hypervisor mode (specifically POWER7 and later).
*
* This file is derived from arch/powerpc/kvm/book3s.c,
* by Alexander Graf <agraf@suse.de>.
*/
#include <linux/kvm_host.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/sched/signal.h>
#include <linux/sched/stat.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/spinlock.h>
#include <linux/page-flags.h>
#include <linux/srcu.h>
#include <linux/miscdevice.h>
#include <linux/debugfs.h>
#include <linux/gfp.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/hugetlb.h>
#include <linux/kvm_irqfd.h>
#include <linux/irqbypass.h>
#include <linux/module.h>
#include <linux/compiler.h>
#include <linux/of.h>
#include <asm/ftrace.h>
#include <asm/reg.h>
#include <asm/ppc-opcode.h>
#include <asm/asm-prototypes.h>
#include <asm/archrandom.h>
#include <asm/debug.h>
#include <asm/disassemble.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <linux/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/lppaca.h>
#include <asm/processor.h>
#include <asm/cputhreads.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <asm/switch_to.h>
#include <asm/smp.h>
#include <asm/dbell.h>
#include <asm/hmi.h>
#include <asm/pnv-pci.h>
#include <asm/mmu.h>
#include <asm/opal.h>
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/hw_breakpoint.h>
#include "book3s.h"
#define CREATE_TRACE_POINTS
#include "trace_hv.h"
/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */
/* Used to indicate that a guest page fault needs to be handled */
#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1)
/* Used to indicate that a guest passthrough interrupt needs to be handled */
#define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2)
/* Used as a "null" value for timebase values */
#define TB_NIL (~(u64)0)
static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);
static int dynamic_mt_modes = 6;
module_param(dynamic_mt_modes, int, 0644);
MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)");
static int target_smt_mode;
module_param(target_smt_mode, int, 0644);
MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)");
static bool indep_threads_mode = true;
module_param(indep_threads_mode, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(indep_threads_mode, "Independent-threads mode (only on POWER9)");
static bool one_vm_per_core;
module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires indep_threads_mode=N)");
#ifdef CONFIG_KVM_XICS
static struct kernel_param_ops module_param_ops = {
.set = param_set_int,
.get = param_get_int,
};
module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644);
MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization");
module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644);
MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core");
#endif
/* If set, guests are allowed to create and control nested guests */
static bool nested = true;
module_param(nested, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)");
static inline bool nesting_enabled(struct kvm *kvm)
{
return kvm->arch.nested_enable && kvm_is_radix(kvm);
}
/* If set, the threads on each CPU core have to be in the same MMU mode */
static bool no_mixing_hpt_and_radix;
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
/*
* RWMR values for POWER8. These control the rate at which PURR
* and SPURR count and should be set according to the number of
* online threads in the vcore being run.
*/
#define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL
#define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL
#define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL
#define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL
static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = {
RWMR_RPA_P8_1THREAD,
RWMR_RPA_P8_1THREAD,
RWMR_RPA_P8_2THREAD,
RWMR_RPA_P8_3THREAD,
RWMR_RPA_P8_4THREAD,
RWMR_RPA_P8_5THREAD,
RWMR_RPA_P8_6THREAD,
RWMR_RPA_P8_7THREAD,
RWMR_RPA_P8_8THREAD,
};
static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc,
int *ip)
{
int i = *ip;
struct kvm_vcpu *vcpu;
while (++i < MAX_SMT_THREADS) {
vcpu = READ_ONCE(vc->runnable_threads[i]);
if (vcpu) {
*ip = i;
return vcpu;
}
}
return NULL;
}
/* Used to traverse the list of runnable threads for a given vcore */
#define for_each_runnable_thread(i, vcpu, vc) \
for (i = -1; (vcpu = next_runnable_thread(vc, &i)); )
static bool kvmppc_ipi_thread(int cpu)
{
unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
/* If we're a nested hypervisor, fall back to ordinary IPIs for now */
if (kvmhv_on_pseries())
return false;
/* On POWER9 we can use msgsnd to IPI any cpu */
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
msg |= get_hard_smp_processor_id(cpu);
smp_mb();
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
return true;
}
/* On POWER8 for IPIs to threads in the same core, use msgsnd */
if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
preempt_disable();
if (cpu_first_thread_sibling(cpu) ==
cpu_first_thread_sibling(smp_processor_id())) {
msg |= cpu_thread_in_core(cpu);
smp_mb();
__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
preempt_enable();
return true;
}
preempt_enable();
}
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
if (cpu >= 0 && cpu < nr_cpu_ids) {
if (paca_ptrs[cpu]->kvm_hstate.xics_phys) {
xics_wake_cpu(cpu);
return true;
}
opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY);
return true;
}
#endif
return false;
}
static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
{
int cpu;
struct swait_queue_head *wqp;
wqp = kvm_arch_vcpu_wq(vcpu);
if (swq_has_sleeper(wqp)) {
swake_up_one(wqp);
++vcpu->stat.halt_wakeup;
}
cpu = READ_ONCE(vcpu->arch.thread_cpu);
if (cpu >= 0 && kvmppc_ipi_thread(cpu))
return;
/* CPU points to the first thread of the core */
cpu = vcpu->cpu;
if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
smp_send_reschedule(cpu);
}
/*
* We use the vcpu_load/put functions to measure stolen time.
* Stolen time is counted as time when either the vcpu is able to
* run as part of a virtual core, but the task running the vcore
* is preempted or sleeping, or when the vcpu needs something done
* in the kernel by the task running the vcpu, but that task is
* preempted or sleeping. Those two things have to be counted
* separately, since one of the vcpu tasks will take on the job
* of running the core, and the other vcpu tasks in the vcore will
* sleep waiting for it to do that, but that sleep shouldn't count
* as stolen time.
*
* Hence we accumulate stolen time when the vcpu can run as part of
* a vcore using vc->stolen_tb, and the stolen time when the vcpu
* needs its task to do other things in the kernel (for example,
* service a page fault) in busy_stolen. We don't accumulate
* stolen time for a vcore when it is inactive, or for a vcpu
* when it is in state RUNNING or NOTREADY. NOTREADY is a bit of
* a misnomer; it means that the vcpu task is not executing in
* the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
* the kernel. We don't have any way of dividing up that time
* between time that the vcpu is genuinely stopped, time that
* the task is actively working on behalf of the vcpu, and time
* that the task is preempted, so we don't count any of it as
* stolen.
*
* Updates to busy_stolen are protected by arch.tbacct_lock;
* updates to vc->stolen_tb are protected by the vcore->stoltb_lock
* lock. The stolen times are measured in units of timebase ticks.
* (Note that the != TB_NIL checks below are purely defensive;
* they should never fail.)
*/
static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc)
{
unsigned long flags;
spin_lock_irqsave(&vc->stoltb_lock, flags);
vc->preempt_tb = mftb();
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
}
static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc)
{
unsigned long flags;
spin_lock_irqsave(&vc->stoltb_lock, flags);
if (vc->preempt_tb != TB_NIL) {
vc->stolen_tb += mftb() - vc->preempt_tb;
vc->preempt_tb = TB_NIL;
}
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
}
static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long flags;
/*
* We can test vc->runner without taking the vcore lock,
* because only this task ever sets vc->runner to this
* vcpu, and once it is set to this vcpu, only this task
* ever sets it to NULL.
*/
if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
kvmppc_core_end_stolen(vc);
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
vcpu->arch.busy_preempt != TB_NIL) {
vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
vcpu->arch.busy_preempt = TB_NIL;
}
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
}
static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long flags;
if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING)
kvmppc_core_start_stolen(vc);
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
vcpu->arch.busy_preempt = mftb();
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
}
static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
{
vcpu->arch.pvr = pvr;
}
/* Dummy value used in computing PCR value below */
#define PCR_ARCH_300 (PCR_ARCH_207 << 1)
static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
{
unsigned long host_pcr_bit = 0, guest_pcr_bit = 0;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
/* We can (emulate) our own architecture version and anything older */
if (cpu_has_feature(CPU_FTR_ARCH_300))
host_pcr_bit = PCR_ARCH_300;
else if (cpu_has_feature(CPU_FTR_ARCH_207S))
host_pcr_bit = PCR_ARCH_207;
else if (cpu_has_feature(CPU_FTR_ARCH_206))
host_pcr_bit = PCR_ARCH_206;
else
host_pcr_bit = PCR_ARCH_205;
/* Determine lowest PCR bit needed to run guest in given PVR level */
guest_pcr_bit = host_pcr_bit;
if (arch_compat) {
switch (arch_compat) {
case PVR_ARCH_205:
guest_pcr_bit = PCR_ARCH_205;
break;
case PVR_ARCH_206:
case PVR_ARCH_206p:
guest_pcr_bit = PCR_ARCH_206;
break;
case PVR_ARCH_207:
guest_pcr_bit = PCR_ARCH_207;
break;
case PVR_ARCH_300:
guest_pcr_bit = PCR_ARCH_300;
break;
default:
return -EINVAL;
}
}
/* Check requested PCR bits don't exceed our capabilities */
if (guest_pcr_bit > host_pcr_bit)
return -EINVAL;
spin_lock(&vc->lock);
vc->arch_compat = arch_compat;
/*
* Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit
* Also set all reserved PCR bits
*/
vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK;
spin_unlock(&vc->lock);
return 0;
}
static void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
{
int r;
pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
pr_err("pc = %.16lx msr = %.16llx trap = %x\n",
vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap);
for (r = 0; r < 16; ++r)
pr_err("r%2d = %.16lx r%d = %.16lx\n",
r, kvmppc_get_gpr(vcpu, r),
r+16, kvmppc_get_gpr(vcpu, r+16));
pr_err("ctr = %.16lx lr = %.16lx\n",
vcpu->arch.regs.ctr, vcpu->arch.regs.link);
pr_err("srr0 = %.16llx srr1 = %.16llx\n",
vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n",
vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr);
pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
pr_err("fault dar = %.16lx dsisr = %.8x\n",
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
for (r = 0; r < vcpu->arch.slb_max; ++r)
pr_err(" ESID = %.16llx VSID = %.16llx\n",
vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
vcpu->arch.last_inst);
}
static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
return kvm_get_vcpu_by_id(kvm, id);
}
static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
vpa->yield_count = cpu_to_be32(1);
}
static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
unsigned long addr, unsigned long len)
{
/* check address is cacheline aligned */
if (addr & (L1_CACHE_BYTES - 1))
return -EINVAL;
spin_lock(&vcpu->arch.vpa_update_lock);
if (v->next_gpa != addr || v->len != len) {
v->next_gpa = addr;
v->len = addr ? len : 0;
v->update_pending = 1;
}
spin_unlock(&vcpu->arch.vpa_update_lock);
return 0;
}
/* Length for a per-processor buffer is passed in at offset 4 in the buffer */
struct reg_vpa {
u32 dummy;
union {
__be16 hword;
__be32 word;
} length;
};
static int vpa_is_registered(struct kvmppc_vpa *vpap)
{
if (vpap->update_pending)
return vpap->next_gpa != 0;
return vpap->pinned_addr != NULL;
}
static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
unsigned long flags,
unsigned long vcpuid, unsigned long vpa)
{
struct kvm *kvm = vcpu->kvm;
unsigned long len, nb;
void *va;
struct kvm_vcpu *tvcpu;
int err;
int subfunc;
struct kvmppc_vpa *vpap;
tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
if (!tvcpu)
return H_PARAMETER;
subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
subfunc == H_VPA_REG_SLB) {
/* Registering new area - address must be cache-line aligned */
if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
return H_PARAMETER;
/* convert logical addr to kernel addr and read length */
va = kvmppc_pin_guest_page(kvm, vpa, &nb);
if (va == NULL)
return H_PARAMETER;
if (subfunc == H_VPA_REG_VPA)
len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
else
len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
kvmppc_unpin_guest_page(kvm, va, vpa, false);
/* Check length */
if (len > nb || len < sizeof(struct reg_vpa))
return H_PARAMETER;
} else {
vpa = 0;
len = 0;
}
err = H_PARAMETER;
vpap = NULL;
spin_lock(&tvcpu->arch.vpa_update_lock);
switch (subfunc) {
case H_VPA_REG_VPA: /* register VPA */
/*
* The size of our lppaca is 1kB because of the way we align
* it for the guest to avoid crossing a 4kB boundary. We only
* use 640 bytes of the structure though, so we should accept
* clients that set a size of 640.
*/
BUILD_BUG_ON(sizeof(struct lppaca) != 640);
if (len < sizeof(struct lppaca))
break;
vpap = &tvcpu->arch.vpa;
err = 0;
break;
case H_VPA_REG_DTL: /* register DTL */
if (len < sizeof(struct dtl_entry))
break;
len -= len % sizeof(struct dtl_entry);
/* Check that they have previously registered a VPA */
err = H_RESOURCE;
if (!vpa_is_registered(&tvcpu->arch.vpa))
break;
vpap = &tvcpu->arch.dtl;
err = 0;
break;
case H_VPA_REG_SLB: /* register SLB shadow buffer */
/* Check that they have previously registered a VPA */
err = H_RESOURCE;
if (!vpa_is_registered(&tvcpu->arch.vpa))
break;
vpap = &tvcpu->arch.slb_shadow;
err = 0;
break;
case H_VPA_DEREG_VPA: /* deregister VPA */
/* Check they don't still have a DTL or SLB buf registered */
err = H_RESOURCE;
if (vpa_is_registered(&tvcpu->arch.dtl) ||
vpa_is_registered(&tvcpu->arch.slb_shadow))
break;
vpap = &tvcpu->arch.vpa;
err = 0;
break;
case H_VPA_DEREG_DTL: /* deregister DTL */
vpap = &tvcpu->arch.dtl;
err = 0;
break;
case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */
vpap = &tvcpu->arch.slb_shadow;
err = 0;
break;
}
if (vpap) {
vpap->next_gpa = vpa;
vpap->len = len;
vpap->update_pending = 1;
}
spin_unlock(&tvcpu->arch.vpa_update_lock);
return err;
}
static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
{
struct kvm *kvm = vcpu->kvm;
void *va;
unsigned long nb;
unsigned long gpa;
/*
* We need to pin the page pointed to by vpap->next_gpa,
* but we can't call kvmppc_pin_guest_page under the lock
* as it does get_user_pages() and down_read(). So we
* have to drop the lock, pin the page, then get the lock
* again and check that a new area didn't get registered
* in the meantime.
*/
for (;;) {
gpa = vpap->next_gpa;
spin_unlock(&vcpu->arch.vpa_update_lock);
va = NULL;
nb = 0;
if (gpa)
va = kvmppc_pin_guest_page(kvm, gpa, &nb);
spin_lock(&vcpu->arch.vpa_update_lock);
if (gpa == vpap->next_gpa)
break;
/* sigh... unpin that one and try again */
if (va)
kvmppc_unpin_guest_page(kvm, va, gpa, false);
}
vpap->update_pending = 0;
if (va && nb < vpap->len) {
/*
* If it's now too short, it must be that userspace
* has changed the mappings underlying guest memory,
* so unregister the region.
*/
kvmppc_unpin_guest_page(kvm, va, gpa, false);
va = NULL;
}
if (vpap->pinned_addr)
kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
vpap->dirty);
vpap->gpa = gpa;
vpap->pinned_addr = va;
vpap->dirty = false;
if (va)
vpap->pinned_end = va + vpap->len;
}
static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.vpa.update_pending ||
vcpu->arch.slb_shadow.update_pending ||
vcpu->arch.dtl.update_pending))
return;
spin_lock(&vcpu->arch.vpa_update_lock);
if (vcpu->arch.vpa.update_pending) {
kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
if (vcpu->arch.vpa.pinned_addr)
init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
}
if (vcpu->arch.dtl.update_pending) {
kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
vcpu->arch.dtl_index = 0;
}
if (vcpu->arch.slb_shadow.update_pending)
kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
/*
* Return the accumulated stolen time for the vcore up until `now'.
* The caller should hold the vcore lock.
*/
static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
{
u64 p;
unsigned long flags;
spin_lock_irqsave(&vc->stoltb_lock, flags);
p = vc->stolen_tb;
if (vc->vcore_state != VCORE_INACTIVE &&
vc->preempt_tb != TB_NIL)
p += now - vc->preempt_tb;
spin_unlock_irqrestore(&vc->stoltb_lock, flags);
return p;
}
static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
struct kvmppc_vcore *vc)
{
struct dtl_entry *dt;
struct lppaca *vpa;
unsigned long stolen;
unsigned long core_stolen;
u64 now;
unsigned long flags;
dt = vcpu->arch.dtl_ptr;
vpa = vcpu->arch.vpa.pinned_addr;
now = mftb();
core_stolen = vcore_stolen_time(vc, now);
stolen = core_stolen - vcpu->arch.stolen_logged;
vcpu->arch.stolen_logged = core_stolen;
spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
stolen += vcpu->arch.busy_stolen;
vcpu->arch.busy_stolen = 0;
spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
if (!dt || !vpa)
return;
memset(dt, 0, sizeof(struct dtl_entry));
dt->dispatch_reason = 7;
dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
dt->timebase = cpu_to_be64(now + vc->tb_offset);
dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
++dt;
if (dt == vcpu->arch.dtl.pinned_end)
dt = vcpu->arch.dtl.pinned_addr;
vcpu->arch.dtl_ptr = dt;
/* order writing *dt vs. writing vpa->dtl_idx */
smp_wmb();
vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
vcpu->arch.dtl.dirty = true;
}
/* See if there is a doorbell interrupt pending for a vcpu */
static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu)
{
int thr;
struct kvmppc_vcore *vc;
if (vcpu->arch.doorbell_request)
return true;
/*
* Ensure that the read of vcore->dpdes comes after the read
* of vcpu->doorbell_request. This barrier matches the
* smp_wmb() in kvmppc_guest_entry_inject().
*/
smp_rmb();
vc = vcpu->arch.vcore;
thr = vcpu->vcpu_id - vc->first_vcpuid;
return !!(vc->dpdes & (1 << thr));
}
static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
return true;
if ((!vcpu->arch.vcore->arch_compat) &&
cpu_has_feature(CPU_FTR_ARCH_207S))
return true;
return false;
}
static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
unsigned long resource, unsigned long value1,
unsigned long value2)
{
switch (resource) {
case H_SET_MODE_RESOURCE_SET_CIABR:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (value2)
return H_P4;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
/* Guests can't breakpoint the hypervisor */
if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
return H_P3;
vcpu->arch.ciabr = value1;
return H_SUCCESS;
case H_SET_MODE_RESOURCE_SET_DAWR:
if (!kvmppc_power8_compatible(vcpu))
return H_P2;
if (!ppc_breakpoint_available())
return H_P2;
if (mflags)
return H_UNSUPPORTED_FLAG_START;
if (value2 & DABRX_HYP)
return H_P4;
vcpu->arch.dawr = value1;
vcpu->arch.dawrx = value2;
return H_SUCCESS;
case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
/* KVM does not support mflags=2 (AIL=2) */
if (mflags != 0 && mflags != 3)
return H_UNSUPPORTED_FLAG_START;
return H_TOO_HARD;
default:
return H_TOO_HARD;
}
}
/* Copy guest memory in place - must reside within a single memslot */
static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from,
unsigned long len)
{
struct kvm_memory_slot *to_memslot = NULL;
struct kvm_memory_slot *from_memslot = NULL;
unsigned long to_addr, from_addr;
int r;
/* Get HPA for from address */
from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT);
if (!from_memslot)
return -EFAULT;
if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages)
<< PAGE_SHIFT))
return -EINVAL;
from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT);
if (kvm_is_error_hva(from_addr))
return -EFAULT;
from_addr |= (from & (PAGE_SIZE - 1));
/* Get HPA for to address */
to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT);
if (!to_memslot)
return -EFAULT;
if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages)
<< PAGE_SHIFT))
return -EINVAL;
to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT);
if (kvm_is_error_hva(to_addr))
return -EFAULT;
to_addr |= (to & (PAGE_SIZE - 1));
/* Perform copy */
r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr,
len);
if (r)
return -EFAULT;
mark_page_dirty(kvm, to >> PAGE_SHIFT);
return 0;
}
static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
unsigned long dest, unsigned long src)
{
u64 pg_sz = SZ_4K; /* 4K page size */
u64 pg_mask = SZ_4K - 1;
int ret;
/* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */
if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE |
H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED))
return H_PARAMETER;
/* dest (and src if copy_page flag set) must be page aligned */
if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask)))
return H_PARAMETER;
/* zero and/or copy the page as determined by the flags */
if (flags & H_COPY_PAGE) {
ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz);
if (ret < 0)
return H_PARAMETER;
} else if (flags & H_ZERO_PAGE) {
ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz);
if (ret < 0)
return H_PARAMETER;
}
/* We can ignore the remaining flags */
return H_SUCCESS;
}
static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
{
struct kvmppc_vcore *vcore = target->arch.vcore;
/*
* We expect to have been called by the real mode handler
* (kvmppc_rm_h_confer()) which would have directly returned
* H_SUCCESS if the source vcore wasn't idle (e.g. if it may
* have useful work to do and should not confer) so we don't
* recheck that here.
*/
spin_lock(&vcore->lock);
if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
vcore->vcore_state != VCORE_INACTIVE &&
vcore->runner)
target = vcore->runner;
spin_unlock(&vcore->lock);
return kvm_vcpu_yield_to(target);
}
static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
{
int yield_count = 0;
struct lppaca *lppaca;
spin_lock(&vcpu->arch.vpa_update_lock);
lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
if (lppaca)
yield_count = be32_to_cpu(lppaca->yield_count);
spin_unlock(&vcpu->arch.vpa_update_lock);
return yield_count;
}
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
unsigned long req = kvmppc_get_gpr(vcpu, 3);
unsigned long target, ret = H_SUCCESS;
int yield_count;
struct kvm_vcpu *tvcpu;
int idx, rc;
if (req <= MAX_HCALL_OPCODE &&
!test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
return RESUME_HOST;
switch (req) {
case H_CEDE:
break;
case H_PROD:
target = kvmppc_get_gpr(vcpu, 4);
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
tvcpu->arch.prodded = 1;
smp_mb();
if (tvcpu->arch.ceded)
kvmppc_fast_vcpu_kick_hv(tvcpu);
break;
case H_CONFER:
target = kvmppc_get_gpr(vcpu, 4);
if (target == -1)
break;
tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
if (!tvcpu) {
ret = H_PARAMETER;
break;
}
yield_count = kvmppc_get_gpr(vcpu, 5);
if (kvmppc_get_yield_count(tvcpu) != yield_count)
break;
kvm_arch_vcpu_yield_to(tvcpu);
break;
case H_REGISTER_VPA:
ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
case H_RTAS:
if (list_empty(&vcpu->kvm->arch.rtas_tokens))
return RESUME_HOST;
idx = srcu_read_lock(&vcpu->kvm->srcu);
rc = kvmppc_rtas_hcall(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (rc == -ENOENT)
return RESUME_HOST;
else if (rc == 0)
break;
/* Send the error out to userspace via KVM_RUN */
return rc;
case H_LOGICAL_CI_LOAD:
ret = kvmppc_h_logical_ci_load(vcpu);
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_LOGICAL_CI_STORE:
ret = kvmppc_h_logical_ci_store(vcpu);
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_SET_MODE:
ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_XIRR:
case H_CPPR:
case H_EOI:
case H_IPI:
case H_IPOLL:
case H_XIRR_X:
if (kvmppc_xics_enabled(vcpu)) {
if (xics_on_xive()) {
ret = H_NOT_AVAILABLE;
return RESUME_GUEST;
}
ret = kvmppc_xics_hcall(vcpu, req);
break;
}
return RESUME_HOST;
case H_SET_DABR:
ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4));
break;
case H_SET_XDABR:
ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
break;
#ifdef CONFIG_SPAPR_TCE_IOMMU
case H_GET_TCE:
ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_PUT_TCE:
ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_PUT_TCE_INDIRECT:
ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
case H_STUFF_TCE:
ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6),
kvmppc_get_gpr(vcpu, 7));
if (ret == H_TOO_HARD)
return RESUME_HOST;
break;
#endif
case H_RANDOM:
if (!powernv_get_random_long(&vcpu->arch.regs.gpr[4]))
ret = H_HARDWARE;
break;
case H_SET_PARTITION_TABLE:
ret = H_FUNCTION;
if (nesting_enabled(vcpu->kvm))
ret = kvmhv_set_partition_table(vcpu);
break;
case H_ENTER_NESTED:
ret = H_FUNCTION;
if (!nesting_enabled(vcpu->kvm))
break;
ret = kvmhv_enter_nested_guest(vcpu);
if (ret == H_INTERRUPT) {
kvmppc_set_gpr(vcpu, 3, 0);
vcpu->arch.hcall_needed = 0;
return -EINTR;
} else if (ret == H_TOO_HARD) {
kvmppc_set_gpr(vcpu, 3, 0);
vcpu->arch.hcall_needed = 0;
return RESUME_HOST;
}
break;
case H_TLB_INVALIDATE:
ret = H_FUNCTION;
if (nesting_enabled(vcpu->kvm))
ret = kvmhv_do_nested_tlbie(vcpu);
break;
case H_COPY_TOFROM_GUEST:
ret = H_FUNCTION;
if (nesting_enabled(vcpu->kvm))
ret = kvmhv_copy_tofrom_guest_nested(vcpu);
break;
case H_PAGE_INIT:
ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4),
kvmppc_get_gpr(vcpu, 5),
kvmppc_get_gpr(vcpu, 6));
break;
default:
return RESUME_HOST;
}
kvmppc_set_gpr(vcpu, 3, ret);
vcpu->arch.hcall_needed = 0;
return RESUME_GUEST;
}
/*
* Handle H_CEDE in the nested virtualization case where we haven't
* called the real-mode hcall handlers in book3s_hv_rmhandlers.S.
* This has to be done early, not in kvmppc_pseries_do_hcall(), so
* that the cede logic in kvmppc_run_single_vcpu() works properly.
*/
static void kvmppc_nested_cede(struct kvm_vcpu *vcpu)
{
vcpu->arch.shregs.msr |= MSR_EE;
vcpu->arch.ceded = 1;
smp_mb();
if (vcpu->arch.prodded) {
vcpu->arch.prodded = 0;
smp_mb();
vcpu->arch.ceded = 0;
}
}
static int kvmppc_hcall_impl_hv(unsigned long cmd)
{
switch (cmd) {
case H_CEDE:
case H_PROD:
case H_CONFER:
case H_REGISTER_VPA:
case H_SET_MODE:
case H_LOGICAL_CI_LOAD:
case H_LOGICAL_CI_STORE:
#ifdef CONFIG_KVM_XICS
case H_XIRR:
case H_CPPR:
case H_EOI:
case H_IPI:
case H_IPOLL:
case H_XIRR_X:
#endif
case H_PAGE_INIT:
return 1;
}
/* See if it's in the real-mode table */
return kvmppc_hcall_impl_hv_realmode(cmd);
}
static int kvmppc_emulate_debug_inst(struct kvm_run *run,
struct kvm_vcpu *vcpu)
{
u32 last_inst;
if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
EMULATE_DONE) {
/*
* Fetch failed, so return to guest and
* try executing it again.
*/
return RESUME_GUEST;
}
if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
run->exit_reason = KVM_EXIT_DEBUG;
run->debug.arch.address = kvmppc_get_pc(vcpu);
return RESUME_HOST;
} else {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
return RESUME_GUEST;
}
}
static void do_nothing(void *x)
{
}
static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu)
{
int thr, cpu, pcpu, nthreads;
struct kvm_vcpu *v;
unsigned long dpdes;
nthreads = vcpu->kvm->arch.emul_smt_mode;
dpdes = 0;
cpu = vcpu->vcpu_id & ~(nthreads - 1);
for (thr = 0; thr < nthreads; ++thr, ++cpu) {
v = kvmppc_find_vcpu(vcpu->kvm, cpu);
if (!v)
continue;
/*
* If the vcpu is currently running on a physical cpu thread,
* interrupt it in order to pull it out of the guest briefly,
* which will update its vcore->dpdes value.
*/
pcpu = READ_ONCE(v->cpu);
if (pcpu >= 0)
smp_call_function_single(pcpu, do_nothing, NULL, 1);
if (kvmppc_doorbell_pending(v))
dpdes |= 1 << thr;
}
return dpdes;
}
/*
* On POWER9, emulate doorbell-related instructions in order to
* give the guest the illusion of running on a multi-threaded core.
* The instructions emulated are msgsndp, msgclrp, mfspr TIR,
* and mfspr DPDES.
*/
static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu)
{
u32 inst, rb, thr;
unsigned long arg;
struct kvm *kvm = vcpu->kvm;
struct kvm_vcpu *tvcpu;
if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &inst) != EMULATE_DONE)
return RESUME_GUEST;
if (get_op(inst) != 31)
return EMULATE_FAIL;
rb = get_rb(inst);
thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1);
switch (get_xop(inst)) {
case OP_31_XOP_MSGSNDP:
arg = kvmppc_get_gpr(vcpu, rb);
if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
break;
arg &= 0x3f;
if (arg >= kvm->arch.emul_smt_mode)
break;
tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg);
if (!tvcpu)
break;
if (!tvcpu->arch.doorbell_request) {
tvcpu->arch.doorbell_request = 1;
kvmppc_fast_vcpu_kick_hv(tvcpu);
}
break;
case OP_31_XOP_MSGCLRP:
arg = kvmppc_get_gpr(vcpu, rb);
if (((arg >> 27) & 0xf) != PPC_DBELL_SERVER)
break;
vcpu->arch.vcore->dpdes = 0;
vcpu->arch.doorbell_request = 0;
break;
case OP_31_XOP_MFSPR:
switch (get_sprn(inst)) {
case SPRN_TIR:
arg = thr;
break;
case SPRN_DPDES:
arg = kvmppc_read_dpdes(vcpu);
break;
default:
return EMULATE_FAIL;
}
kvmppc_set_gpr(vcpu, get_rt(inst), arg);
break;
default:
return EMULATE_FAIL;
}
kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4);
return RESUME_GUEST;
}
static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
struct task_struct *tsk)
{
int r = RESUME_HOST;
vcpu->stat.sum_exits++;
/*
* This can happen if an interrupt occurs in the last stages
* of guest entry or the first stages of guest exit (i.e. after
* setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
* and before setting it to KVM_GUEST_MODE_HOST_HV).
* That can happen due to a bug, or due to a machine check
* occurring at just the wrong time.
*/
if (vcpu->arch.shregs.msr & MSR_HV) {
printk(KERN_EMERG "KVM trap in HV mode!\n");
printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
kvmppc_dump_regs(vcpu);
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
run->hw.hardware_exit_reason = vcpu->arch.trap;
return RESUME_HOST;
}
run->exit_reason = KVM_EXIT_UNKNOWN;
run->ready_for_interrupt_injection = 1;
switch (vcpu->arch.trap) {
/* We're good on these - the host merely wanted to get our attention */
case BOOK3S_INTERRUPT_HV_DECREMENTER:
vcpu->stat.dec_exits++;
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_EXTERNAL:
case BOOK3S_INTERRUPT_H_DOORBELL:
case BOOK3S_INTERRUPT_H_VIRT:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
/* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
case BOOK3S_INTERRUPT_HMI:
case BOOK3S_INTERRUPT_PERFMON:
case BOOK3S_INTERRUPT_SYSTEM_RESET:
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_MACHINE_CHECK:
/* Print the MCE event to host console. */
machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
/*
* If the guest can do FWNMI, exit to userspace so it can
* deliver a FWNMI to the guest.
* Otherwise we synthesize a machine check for the guest
* so that it knows that the machine check occurred.
*/
if (!vcpu->kvm->arch.fwnmi_enabled) {
ulong flags = vcpu->arch.shregs.msr & 0x083c0000;
kvmppc_core_queue_machine_check(vcpu, flags);
r = RESUME_GUEST;
break;
}
/* Exit to guest with KVM_EXIT_NMI as exit reason */
run->exit_reason = KVM_EXIT_NMI;
run->hw.hardware_exit_reason = vcpu->arch.trap;
/* Clear out the old NMI status from run->flags */
run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK;
/* Now set the NMI status */
if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED)
run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV;
else
run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV;
r = RESUME_HOST;
break;
case BOOK3S_INTERRUPT_PROGRAM:
{
ulong flags;
/*
* Normally program interrupts are delivered directly
* to the guest by the hardware, but we can get here
* as a result of a hypervisor emulation interrupt
* (e40) getting turned into a 700 by BML RTAS.
*/
flags = vcpu->arch.shregs.msr & 0x1f0000ull;
kvmppc_core_queue_program(vcpu, flags);
r = RESUME_GUEST;
break;
}
case BOOK3S_INTERRUPT_SYSCALL:
{
/* hcall - punt to userspace */
int i;
/* hypercall with MSR_PR has already been handled in rmode,
* and never reaches here.
*/
run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
for (i = 0; i < 9; ++i)
run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
run->exit_reason = KVM_EXIT_PAPR_HCALL;
vcpu->arch.hcall_needed = 1;
r = RESUME_HOST;
break;
}
/*
* We get these next two if the guest accesses a page which it thinks
* it has mapped but which is not actually present, either because
* it is for an emulated I/O device or because the corresonding
* host page has been paged out. Any other HDSI/HISI interrupts
* have been handled already.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
r = RESUME_PAGE_FAULT;
break;
case BOOK3S_INTERRUPT_H_INST_STORAGE:
vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
vcpu->arch.fault_dsisr = vcpu->arch.shregs.msr &
DSISR_SRR1_MATCH_64S;
if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
r = RESUME_PAGE_FAULT;
break;
/*
* This occurs if the guest executes an illegal instruction.
* If the guest debug is disabled, generate a program interrupt
* to the guest. If guest debug is enabled, we need to check
* whether the instruction is a software breakpoint instruction.
* Accordingly return to Guest or Host.
*/
case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
swab32(vcpu->arch.emul_inst) :
vcpu->arch.emul_inst;
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
r = kvmppc_emulate_debug_inst(run, vcpu);
} else {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
r = RESUME_GUEST;
}
break;
/*
* This occurs if the guest (kernel or userspace), does something that
* is prohibited by HFSCR.
* On POWER9, this could be a doorbell instruction that we need
* to emulate.
* Otherwise, we just generate a program interrupt to the guest.
*/
case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
r = EMULATE_FAIL;
if (((vcpu->arch.hfscr >> 56) == FSCR_MSGP_LG) &&
cpu_has_feature(CPU_FTR_ARCH_300))
r = kvmppc_emulate_doorbell_instr(vcpu);
if (r == EMULATE_FAIL) {
kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
r = RESUME_GUEST;
}
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case BOOK3S_INTERRUPT_HV_SOFTPATCH:
/*
* This occurs for various TM-related instructions that
* we need to emulate on POWER9 DD2.2. We have already
* handled the cases where the guest was in real-suspend
* mode and was transitioning to transactional state.
*/
r = kvmhv_p9_tm_emulation(vcpu);
break;
#endif
case BOOK3S_INTERRUPT_HV_RM_HARD:
r = RESUME_PASSTHROUGH;
break;
default:
kvmppc_dump_regs(vcpu);
printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
run->hw.hardware_exit_reason = vcpu->arch.trap;
r = RESUME_HOST;
break;
}
return r;
}
static int kvmppc_handle_nested_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
int r;
int srcu_idx;
vcpu->stat.sum_exits++;
/*
* This can happen if an interrupt occurs in the last stages
* of guest entry or the first stages of guest exit (i.e. after
* setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV
* and before setting it to KVM_GUEST_MODE_HOST_HV).
* That can happen due to a bug, or due to a machine check
* occurring at just the wrong time.
*/
if (vcpu->arch.shregs.msr & MSR_HV) {
pr_emerg("KVM trap in HV mode while nested!\n");
pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n",
vcpu->arch.trap, kvmppc_get_pc(vcpu),
vcpu->arch.shregs.msr);
kvmppc_dump_regs(vcpu);
return RESUME_HOST;
}
switch (vcpu->arch.trap) {
/* We're good on these - the host merely wanted to get our attention */
case BOOK3S_INTERRUPT_HV_DECREMENTER:
vcpu->stat.dec_exits++;
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_EXTERNAL:
vcpu->stat.ext_intr_exits++;
r = RESUME_HOST;
break;
case BOOK3S_INTERRUPT_H_DOORBELL:
case BOOK3S_INTERRUPT_H_VIRT:
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
/* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/
case BOOK3S_INTERRUPT_HMI:
case BOOK3S_INTERRUPT_PERFMON:
case BOOK3S_INTERRUPT_SYSTEM_RESET:
r = RESUME_GUEST;
break;
case BOOK3S_INTERRUPT_MACHINE_CHECK:
/* Pass the machine check to the L1 guest */
r = RESUME_HOST;
/* Print the MCE event to host console. */
machine_check_print_event_info(&vcpu->arch.mce_evt, false, true);
break;
/*
* We get these next two if the guest accesses a page which it thinks
* it has mapped but which is not actually present, either because
* it is for an emulated I/O device or because the corresonding
* host page has been paged out.
*/
case BOOK3S_INTERRUPT_H_DATA_STORAGE:
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvmhv_nested_page_fault(run, vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
break;
case BOOK3S_INTERRUPT_H_INST_STORAGE:
vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) &
DSISR_SRR1_MATCH_64S;
if (vcpu->arch.shregs.msr & HSRR1_HISI_WRITE)
vcpu->arch.fault_dsisr |= DSISR_ISSTORE;
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = kvmhv_nested_page_fault(run, vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case BOOK3S_INTERRUPT_HV_SOFTPATCH:
/*
* This occurs for various TM-related instructions that
* we need to emulate on POWER9 DD2.2. We have already
* handled the cases where the guest was in real-suspend
* mode and was transitioning to transactional state.
*/
r = kvmhv_p9_tm_emulation(vcpu);
break;
#endif
case BOOK3S_INTERRUPT_HV_RM_HARD:
vcpu->arch.trap = 0;
r = RESUME_GUEST;
if (!xics_on_xive())
kvmppc_xics_rm_complete(vcpu, 0);
break;
default:
r = RESUME_HOST;
break;
}
return r;
}
static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i;
memset(sregs, 0, sizeof(struct kvm_sregs));
sregs->pvr = vcpu->arch.pvr;
for (i = 0; i < vcpu->arch.slb_max; i++) {
sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
}
return 0;
}
static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int i, j;
/* Only accept the same PVR as the host's, since we can't spoof it */
if (sregs->pvr != vcpu->arch.pvr)
return -EINVAL;
j = 0;
for (i = 0; i < vcpu->arch.slb_nr; i++) {
if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
++j;
}
}
vcpu->arch.slb_max = j;
return 0;
}
static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
bool preserve_top32)
{
struct kvm *kvm = vcpu->kvm;
struct kvmppc_vcore *vc = vcpu->arch.vcore;
u64 mask;
spin_lock(&vc->lock);
/*
* If ILE (interrupt little-endian) has changed, update the
* MSR_LE bit in the intr_msr for each vcpu in this vcore.
*/
if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
struct kvm_vcpu *vcpu;
int i;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.vcore != vc)
continue;
if (new_lpcr & LPCR_ILE)
vcpu->arch.intr_msr |= MSR_LE;
else
vcpu->arch.intr_msr &= ~MSR_LE;
}
}
/*
* Userspace can only modify DPFD (default prefetch depth),
* ILE (interrupt little-endian) and TC (translation control).
* On POWER8 and POWER9 userspace can also modify AIL (alt. interrupt loc.).
*/
mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
mask |= LPCR_AIL;
/*
* On POWER9, allow userspace to enable large decrementer for the
* guest, whether or not the host has it enabled.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
mask |= LPCR_LD;
/* Broken 32-bit version of LPCR must not clear top bits */
if (preserve_top32)
mask &= 0xFFFFFFFF;
vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
spin_unlock(&vc->lock);
}
static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
union kvmppc_one_reg *val)
{
int r = 0;
long int i;
switch (id) {
case KVM_REG_PPC_DEBUG_INST:
*val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
break;
case KVM_REG_PPC_HIOR:
*val = get_reg_val(id, 0);
break;
case KVM_REG_PPC_DABR:
*val = get_reg_val(id, vcpu->arch.dabr);
break;
case KVM_REG_PPC_DABRX:
*val = get_reg_val(id, vcpu->arch.dabrx);
break;
case KVM_REG_PPC_DSCR:
*val = get_reg_val(id, vcpu->arch.dscr);
break;
case KVM_REG_PPC_PURR:
*val = get_reg_val(id, vcpu->arch.purr);
break;
case KVM_REG_PPC_SPURR:
*val = get_reg_val(id, vcpu->arch.spurr);
break;
case KVM_REG_PPC_AMR:
*val = get_reg_val(id, vcpu->arch.amr);
break;
case KVM_REG_PPC_UAMOR:
*val = get_reg_val(id, vcpu->arch.uamor);
break;
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
i = id - KVM_REG_PPC_MMCR0;
*val = get_reg_val(id, vcpu->arch.mmcr[i]);
break;
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
i = id - KVM_REG_PPC_PMC1;
*val = get_reg_val(id, vcpu->arch.pmc[i]);
break;
case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
i = id - KVM_REG_PPC_SPMC1;
*val = get_reg_val(id, vcpu->arch.spmc[i]);
break;
case KVM_REG_PPC_SIAR:
*val = get_reg_val(id, vcpu->arch.siar);
break;
case KVM_REG_PPC_SDAR:
*val = get_reg_val(id, vcpu->arch.sdar);
break;
case KVM_REG_PPC_SIER:
*val = get_reg_val(id, vcpu->arch.sier);
break;
case KVM_REG_PPC_IAMR:
*val = get_reg_val(id, vcpu->arch.iamr);
break;
case KVM_REG_PPC_PSPB:
*val = get_reg_val(id, vcpu->arch.pspb);
break;
case KVM_REG_PPC_DPDES:
/*
* On POWER9, where we are emulating msgsndp etc.,
* we return 1 bit for each vcpu, which can come from
* either vcore->dpdes or doorbell_request.
* On POWER8, doorbell_request is 0.
*/
*val = get_reg_val(id, vcpu->arch.vcore->dpdes |
vcpu->arch.doorbell_request);
break;
case KVM_REG_PPC_VTB:
*val = get_reg_val(id, vcpu->arch.vcore->vtb);
break;
case KVM_REG_PPC_DAWR:
*val = get_reg_val(id, vcpu->arch.dawr);
break;
case KVM_REG_PPC_DAWRX:
*val = get_reg_val(id, vcpu->arch.dawrx);
break;
case KVM_REG_PPC_CIABR:
*val = get_reg_val(id, vcpu->arch.ciabr);
break;
case KVM_REG_PPC_CSIGR:
*val = get_reg_val(id, vcpu->arch.csigr);
break;
case KVM_REG_PPC_TACR:
*val = get_reg_val(id, vcpu->arch.tacr);
break;
case KVM_REG_PPC_TCSCR:
*val = get_reg_val(id, vcpu->arch.tcscr);
break;
case KVM_REG_PPC_PID:
*val = get_reg_val(id, vcpu->arch.pid);
break;
case KVM_REG_PPC_ACOP:
*val = get_reg_val(id, vcpu->arch.acop);
break;
case KVM_REG_PPC_WORT:
*val = get_reg_val(id, vcpu->arch.wort);
break;
case KVM_REG_PPC_TIDR:
*val = get_reg_val(id, vcpu->arch.tid);
break;
case KVM_REG_PPC_PSSCR:
*val = get_reg_val(id, vcpu->arch.psscr);
break;
case KVM_REG_PPC_VPA_ADDR:
spin_lock(&vcpu->arch.vpa_update_lock);
*val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_VPA_SLB:
spin_lock(&vcpu->arch.vpa_update_lock);
val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
val->vpaval.length = vcpu->arch.slb_shadow.len;
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_VPA_DTL:
spin_lock(&vcpu->arch.vpa_update_lock);
val->vpaval.addr = vcpu->arch.dtl.next_gpa;
val->vpaval.length = vcpu->arch.dtl.len;
spin_unlock(&vcpu->arch.vpa_update_lock);
break;
case KVM_REG_PPC_TB_OFFSET:
*val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
break;
case KVM_REG_PPC_LPCR:
case KVM_REG_PPC_LPCR_64:
*val = get_reg_val(id, vcpu->arch.vcore->lpcr);
break;
case KVM_REG_PPC_PPR:
*val = get_reg_val(id, vcpu->arch.ppr);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case KVM_REG_PPC_TFHAR:
*val = get_reg_val(id, vcpu->arch.tfhar);
break;
case KVM_REG_PPC_TFIAR:
*val = get_reg_val(id, vcpu->arch.tfiar);
break;
case KVM_REG_PPC_TEXASR:
*val = get_reg_val(id, vcpu->arch.texasr);
break;
case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
i = id - KVM_REG_PPC_TM_GPR0;
*val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
break;
case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
{
int j;
i = id - KVM_REG_PPC_TM_VSR0;
if (i < 32)
for (j = 0; j < TS_FPRWIDTH; j++)
val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
else {
if (cpu_has_feature(CPU_FTR_ALTIVEC))
val->vval = vcpu->arch.vr_tm.vr[i-32];
else
r = -ENXIO;
}
break;
}
case KVM_REG_PPC_TM_CR:
*val = get_reg_val(id, vcpu->arch.cr_tm);
break;
case KVM_REG_PPC_TM_XER:
*val = get_reg_val(id, vcpu->arch.xer_tm);
break;
case KVM_REG_PPC_TM_LR:
*val = get_reg_val(id, vcpu->arch.lr_tm);
break;
case KVM_REG_PPC_TM_CTR:
*val = get_reg_val(id, vcpu->arch.ctr_tm);
break;
case KVM_REG_PPC_TM_FPSCR:
*val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
break;
case KVM_REG_PPC_TM_AMR:
*val = get_reg_val(id, vcpu->arch.amr_tm);
break;
case KVM_REG_PPC_TM_PPR:
*val = get_reg_val(id, vcpu->arch.ppr_tm);
break;
case KVM_REG_PPC_TM_VRSAVE:
*val = get_reg_val(id, vcpu->arch.vrsave_tm);
break;
case KVM_REG_PPC_TM_VSCR:
if (cpu_has_feature(CPU_FTR_ALTIVEC))
*val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
else
r = -ENXIO;
break;
case KVM_REG_PPC_TM_DSCR:
*val = get_reg_val(id, vcpu->arch.dscr_tm);
break;
case KVM_REG_PPC_TM_TAR:
*val = get_reg_val(id, vcpu->arch.tar_tm);
break;
#endif
case KVM_REG_PPC_ARCH_COMPAT:
*val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
break;
case KVM_REG_PPC_DEC_EXPIRY:
*val = get_reg_val(id, vcpu->arch.dec_expires +
vcpu->arch.vcore->tb_offset);
break;
case KVM_REG_PPC_ONLINE:
*val = get_reg_val(id, vcpu->arch.online);
break;
case KVM_REG_PPC_PTCR:
*val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr);
break;
default:
r = -EINVAL;
break;
}
return r;
}
static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
union kvmppc_one_reg *val)
{
int r = 0;
long int i;
unsigned long addr, len;
switch (id) {
case KVM_REG_PPC_HIOR:
/* Only allow this to be set to zero */
if (set_reg_val(id, *val))
r = -EINVAL;
break;
case KVM_REG_PPC_DABR:
vcpu->arch.dabr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DABRX:
vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
break;
case KVM_REG_PPC_DSCR:
vcpu->arch.dscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PURR:
vcpu->arch.purr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SPURR:
vcpu->arch.spurr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_AMR:
vcpu->arch.amr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_UAMOR:
vcpu->arch.uamor = set_reg_val(id, *val);
break;
case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
i = id - KVM_REG_PPC_MMCR0;
vcpu->arch.mmcr[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
i = id - KVM_REG_PPC_PMC1;
vcpu->arch.pmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
i = id - KVM_REG_PPC_SPMC1;
vcpu->arch.spmc[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIAR:
vcpu->arch.siar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SDAR:
vcpu->arch.sdar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_SIER:
vcpu->arch.sier = set_reg_val(id, *val);
break;
case KVM_REG_PPC_IAMR:
vcpu->arch.iamr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PSPB:
vcpu->arch.pspb = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DPDES:
vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
break;
case KVM_REG_PPC_VTB:
vcpu->arch.vcore->vtb = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWR:
vcpu->arch.dawr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_DAWRX:
vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
break;
case KVM_REG_PPC_CIABR:
vcpu->arch.ciabr = set_reg_val(id, *val);
/* Don't allow setting breakpoints in hypervisor code */
if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
vcpu->arch.ciabr &= ~CIABR_PRIV; /* disable */
break;
case KVM_REG_PPC_CSIGR:
vcpu->arch.csigr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TACR:
vcpu->arch.tacr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TCSCR:
vcpu->arch.tcscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PID:
vcpu->arch.pid = set_reg_val(id, *val);
break;
case KVM_REG_PPC_ACOP:
vcpu->arch.acop = set_reg_val(id, *val);
break;
case KVM_REG_PPC_WORT:
vcpu->arch.wort = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TIDR:
vcpu->arch.tid = set_reg_val(id, *val);
break;
case KVM_REG_PPC_PSSCR:
vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS;
break;
case KVM_REG_PPC_VPA_ADDR:
addr = set_reg_val(id, *val);
r = -EINVAL;
if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
vcpu->arch.dtl.next_gpa))
break;
r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
break;
case KVM_REG_PPC_VPA_SLB:
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (addr && !vcpu->arch.vpa.next_gpa)
break;
r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
break;
case KVM_REG_PPC_VPA_DTL:
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (addr && (len < sizeof(struct dtl_entry) ||
!vcpu->arch.vpa.next_gpa))
break;
len -= len % sizeof(struct dtl_entry);
r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
break;
case KVM_REG_PPC_TB_OFFSET:
/* round up to multiple of 2^24 */
vcpu->arch.vcore->tb_offset =
ALIGN(set_reg_val(id, *val), 1UL << 24);
break;
case KVM_REG_PPC_LPCR:
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
break;
case KVM_REG_PPC_LPCR_64:
kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
break;
case KVM_REG_PPC_PPR:
vcpu->arch.ppr = set_reg_val(id, *val);
break;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
case KVM_REG_PPC_TFHAR:
vcpu->arch.tfhar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TFIAR:
vcpu->arch.tfiar = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TEXASR:
vcpu->arch.texasr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
i = id - KVM_REG_PPC_TM_GPR0;
vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
{
int j;
i = id - KVM_REG_PPC_TM_VSR0;
if (i < 32)
for (j = 0; j < TS_FPRWIDTH; j++)
vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
else
if (cpu_has_feature(CPU_FTR_ALTIVEC))
vcpu->arch.vr_tm.vr[i-32] = val->vval;
else
r = -ENXIO;
break;
}
case KVM_REG_PPC_TM_CR:
vcpu->arch.cr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_XER:
vcpu->arch.xer_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_LR:
vcpu->arch.lr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_CTR:
vcpu->arch.ctr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_FPSCR:
vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_AMR:
vcpu->arch.amr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_PPR:
vcpu->arch.ppr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VRSAVE:
vcpu->arch.vrsave_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_VSCR:
if (cpu_has_feature(CPU_FTR_ALTIVEC))
vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
else
r = - ENXIO;
break;
case KVM_REG_PPC_TM_DSCR:
vcpu->arch.dscr_tm = set_reg_val(id, *val);
break;
case KVM_REG_PPC_TM_TAR:
vcpu->arch.tar_tm = set_reg_val(id, *val);
break;
#endif
case KVM_REG_PPC_ARCH_COMPAT:
r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
break;
case KVM_REG_PPC_DEC_EXPIRY:
vcpu->arch.dec_expires = set_reg_val(id, *val) -
vcpu->arch.vcore->tb_offset;
break;
case KVM_REG_PPC_ONLINE:
i = set_reg_val(id, *val);
if (i && !vcpu->arch.online)
atomic_inc(&vcpu->arch.vcore->online_count);
else if (!i && vcpu->arch.online)
atomic_dec(&vcpu->arch.vcore->online_count);
vcpu->arch.online = i;
break;
case KVM_REG_PPC_PTCR:
vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val);
break;
default:
r = -EINVAL;
break;
}
return r;
}
/*
* On POWER9, threads are independent and can be in different partitions.
* Therefore we consider each thread to be a subcore.
* There is a restriction that all threads have to be in the same
* MMU mode (radix or HPT), unfortunately, but since we only support
* HPT guests on a HPT host so far, that isn't an impediment yet.
*/
static int threads_per_vcore(struct kvm *kvm)
{
if (kvm->arch.threads_indep)
return 1;
return threads_per_subcore;
}
static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id)
{
struct kvmppc_vcore *vcore;
vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
if (vcore == NULL)
return NULL;
spin_lock_init(&vcore->lock);
spin_lock_init(&vcore->stoltb_lock);
init_swait_queue_head(&vcore->wq);
vcore->preempt_tb = TB_NIL;
vcore->lpcr = kvm->arch.lpcr;
vcore->first_vcpuid = id;
vcore->kvm = kvm;
INIT_LIST_HEAD(&vcore->preempt_list);
return vcore;
}
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
static struct debugfs_timings_element {
const char *name;
size_t offset;
} timings[] = {
{"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)},
{"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)},
{"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)},
{"guest", offsetof(struct kvm_vcpu, arch.guest_time)},
{"cede", offsetof(struct kvm_vcpu, arch.cede_time)},
};
#define N_TIMINGS (ARRAY_SIZE(timings))
struct debugfs_timings_state {
struct kvm_vcpu *vcpu;
unsigned int buflen;
char buf[N_TIMINGS * 100];
};
static int debugfs_timings_open(struct inode *inode, struct file *file)
{
struct kvm_vcpu *vcpu = inode->i_private;
struct debugfs_timings_state *p;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
kvm_get_kvm(vcpu->kvm);
p->vcpu = vcpu;
file->private_data = p;
return nonseekable_open(inode, file);
}
static int debugfs_timings_release(struct inode *inode, struct file *file)
{
struct debugfs_timings_state *p = file->private_data;
kvm_put_kvm(p->vcpu->kvm);
kfree(p);
return 0;
}
static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
size_t len, loff_t *ppos)
{
struct debugfs_timings_state *p = file->private_data;
struct kvm_vcpu *vcpu = p->vcpu;
char *s, *buf_end;
struct kvmhv_tb_accumulator tb;
u64 count;
loff_t pos;
ssize_t n;
int i, loops;
bool ok;
if (!p->buflen) {
s = p->buf;
buf_end = s + sizeof(p->buf);
for (i = 0; i < N_TIMINGS; ++i) {
struct kvmhv_tb_accumulator *acc;
acc = (struct kvmhv_tb_accumulator *)
((unsigned long)vcpu + timings[i].offset);
ok = false;
for (loops = 0; loops < 1000; ++loops) {
count = acc->seqcount;
if (!(count & 1)) {
smp_rmb();
tb = *acc;
smp_rmb();
if (count == acc->seqcount) {
ok = true;
break;
}
}
udelay(1);
}
if (!ok)
snprintf(s, buf_end - s, "%s: stuck\n",
timings[i].name);
else
snprintf(s, buf_end - s,
"%s: %llu %llu %llu %llu\n",
timings[i].name, count / 2,
tb_to_ns(tb.tb_total),
tb_to_ns(tb.tb_min),
tb_to_ns(tb.tb_max));
s += strlen(s);
}
p->buflen = s - p->buf;
}
pos = *ppos;
if (pos >= p->buflen)
return 0;
if (len > p->buflen - pos)
len = p->buflen - pos;
n = copy_to_user(buf, p->buf + pos, len);
if (n) {
if (n == len)
return -EFAULT;
len -= n;
}
*ppos = pos + len;
return len;
}
static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
return -EACCES;
}
static const struct file_operations debugfs_timings_ops = {
.owner = THIS_MODULE,
.open = debugfs_timings_open,
.release = debugfs_timings_release,
.read = debugfs_timings_read,
.write = debugfs_timings_write,
.llseek = generic_file_llseek,
};
/* Create a debugfs directory for the vcpu */
static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
{
char buf[16];
struct kvm *kvm = vcpu->kvm;
snprintf(buf, sizeof(buf), "vcpu%u", id);
if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
return;
vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
return;
vcpu->arch.debugfs_timings =
debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
vcpu, &debugfs_timings_ops);
}
#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
{
}
#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
unsigned int id)
{
struct kvm_vcpu *vcpu;
int err;
int core;
struct kvmppc_vcore *vcore;
err = -ENOMEM;
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu)
goto out;
err = kvm_vcpu_init(vcpu, kvm, id);
if (err)
goto free_vcpu;
vcpu->arch.shared = &vcpu->arch.shregs;
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
/*
* The shared struct is never shared on HV,
* so we can always use host endianness
*/
#ifdef __BIG_ENDIAN__
vcpu->arch.shared_big_endian = true;
#else
vcpu->arch.shared_big_endian = false;
#endif
#endif
vcpu->arch.mmcr[0] = MMCR0_FC;
vcpu->arch.ctrl = CTRL_RUNLATCH;
/* default to host PVR, since we can't spoof it */
kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
spin_lock_init(&vcpu->arch.vpa_update_lock);
spin_lock_init(&vcpu->arch.tbacct_lock);
vcpu->arch.busy_preempt = TB_NIL;
vcpu->arch.intr_msr = MSR_SF | MSR_ME;
/*
* Set the default HFSCR for the guest from the host value.
* This value is only used on POWER9.
* On POWER9, we want to virtualize the doorbell facility, so we
* don't set the HFSCR_MSGP bit, and that causes those instructions
* to trap and then we emulate them.
*/
vcpu->arch.hfscr = HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB |
HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP;
if (cpu_has_feature(CPU_FTR_HVMODE)) {
vcpu->arch.hfscr &= mfspr(SPRN_HFSCR);
if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
vcpu->arch.hfscr |= HFSCR_TM;
}
if (cpu_has_feature(CPU_FTR_TM_COMP))
vcpu->arch.hfscr |= HFSCR_TM;
kvmppc_mmu_book3s_hv_init(vcpu);
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
init_waitqueue_head(&vcpu->arch.cpu_run);
mutex_lock(&kvm->lock);
vcore = NULL;
err = -EINVAL;
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) {
pr_devel("KVM: VCPU ID too high\n");
core = KVM_MAX_VCORES;
} else {
BUG_ON(kvm->arch.smt_mode != 1);
core = kvmppc_pack_vcpu_id(kvm, id);
}
} else {
core = id / kvm->arch.smt_mode;
}
if (core < KVM_MAX_VCORES) {
vcore = kvm->arch.vcores[core];
if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) {
pr_devel("KVM: collision on id %u", id);
vcore = NULL;
} else if (!vcore) {
/*
* Take mmu_setup_lock for mutual exclusion
* with kvmppc_update_lpcr().
*/
err = -ENOMEM;
vcore = kvmppc_vcore_create(kvm,
id & ~(kvm->arch.smt_mode - 1));
mutex_lock(&kvm->arch.mmu_setup_lock);
kvm->arch.vcores[core] = vcore;
kvm->arch.online_vcores++;
mutex_unlock(&kvm->arch.mmu_setup_lock);
}
}
mutex_unlock(&kvm->lock);
if (!vcore)
goto free_vcpu;
spin_lock(&vcore->lock);
++vcore->num_threads;
spin_unlock(&vcore->lock);
vcpu->arch.vcore = vcore;
vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
vcpu->arch.thread_cpu = -1;
vcpu->arch.prev_cpu = -1;
vcpu->arch.cpu_type = KVM_CPU_3S_64;
kvmppc_sanity_check(vcpu);
debugfs_vcpu_init(vcpu, id);
return vcpu;
free_vcpu:
kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
return ERR_PTR(err);
}
static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode,
unsigned long flags)
{
int err;
int esmt = 0;
if (flags)
return -EINVAL;
if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode))
return -EINVAL;
if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
/*
* On POWER8 (or POWER7), the threading mode is "strict",
* so we pack smt_mode vcpus per vcore.
*/
if (smt_mode > threads_per_subcore)
return -EINVAL;
} else {
/*
* On POWER9, the threading mode is "loose",
* so each vcpu gets its own vcore.
*/
esmt = smt_mode;
smt_mode = 1;
}
mutex_lock(&kvm->lock);
err = -EBUSY;
if (!kvm->arch.online_vcores) {
kvm->arch.smt_mode = smt_mode;
kvm->arch.emul_smt_mode = esmt;
err = 0;
}
mutex_unlock(&kvm->lock);
return err;
}
static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
{
if (vpa->pinned_addr)
kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
vpa->dirty);
}
static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
{
spin_lock(&vcpu->arch.vpa_update_lock);
unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
spin_unlock(&vcpu->arch.vpa_update_lock);
kvm_vcpu_uninit(vcpu);
kmem_cache_free(kvm_vcpu_cache, vcpu);
}
static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
{
/* Indicate we want to get back into the guest */
return 1;
}
static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec, now;
now = get_tb();
if (now > vcpu->arch.dec_expires) {
/* decrementer has already gone negative */
kvmppc_core_queue_dec(vcpu);
kvmppc_core_prepare_to_enter(vcpu);
return;
}
dec_nsec = tb_to_ns(vcpu->arch.dec_expires - now);
hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL);
vcpu->arch.timer_running = 1;
}
extern int __kvmppc_vcore_entry(void);
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu)
{
u64 now;
if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
spin_lock_irq(&vcpu->arch.tbacct_lock);
now = mftb();
vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
vcpu->arch.stolen_logged;
vcpu->arch.busy_preempt = now;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
spin_unlock_irq(&vcpu->arch.tbacct_lock);
--vc->n_runnable;
WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL);
}
static int kvmppc_grab_hwthread(int cpu)
{
struct paca_struct *tpaca;
long timeout = 10000;
tpaca = paca_ptrs[cpu];
/* Ensure the thread won't go into the kernel if it wakes */
tpaca->kvm_hstate.kvm_vcpu = NULL;
tpaca->kvm_hstate.kvm_vcore = NULL;
tpaca->kvm_hstate.napping = 0;
smp_wmb();
tpaca->kvm_hstate.hwthread_req = 1;
/*
* If the thread is already executing in the kernel (e.g. handling
* a stray interrupt), wait for it to get back to nap mode.
* The smp_mb() is to ensure that our setting of hwthread_req
* is visible before we look at hwthread_state, so if this
* races with the code at system_reset_pSeries and the thread
* misses our setting of hwthread_req, we are sure to see its
* setting of hwthread_state, and vice versa.
*/
smp_mb();
while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
if (--timeout <= 0) {
pr_err("KVM: couldn't grab cpu %d\n", cpu);
return -EBUSY;
}
udelay(1);
}
return 0;
}
static void kvmppc_release_hwthread(int cpu)
{
struct paca_struct *tpaca;
tpaca = paca_ptrs[cpu];
tpaca->kvm_hstate.hwthread_req = 0;
tpaca->kvm_hstate.kvm_vcpu = NULL;
tpaca->kvm_hstate.kvm_vcore = NULL;
tpaca->kvm_hstate.kvm_split_mode = NULL;
}
static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu)
{
struct kvm_nested_guest *nested = vcpu->arch.nested;
cpumask_t *cpu_in_guest;
int i;
cpu = cpu_first_thread_sibling(cpu);
if (nested) {
cpumask_set_cpu(cpu, &nested->need_tlb_flush);
cpu_in_guest = &nested->cpu_in_guest;
} else {
cpumask_set_cpu(cpu, &kvm->arch.need_tlb_flush);
cpu_in_guest = &kvm->arch.cpu_in_guest;
}
/*
* Make sure setting of bit in need_tlb_flush precedes
* testing of cpu_in_guest bits. The matching barrier on
* the other side is the first smp_mb() in kvmppc_run_core().
*/
smp_mb();
for (i = 0; i < threads_per_core; ++i)
if (cpumask_test_cpu(cpu + i, cpu_in_guest))
smp_call_function_single(cpu + i, do_nothing, NULL, 1);
}
static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu)
{
struct kvm_nested_guest *nested = vcpu->arch.nested;
struct kvm *kvm = vcpu->kvm;
int prev_cpu;
if (!cpu_has_feature(CPU_FTR_HVMODE))
return;
if (nested)
prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id];
else
prev_cpu = vcpu->arch.prev_cpu;
/*
* With radix, the guest can do TLB invalidations itself,
* and it could choose to use the local form (tlbiel) if
* it is invalidating a translation that has only ever been
* used on one vcpu. However, that doesn't mean it has
* only ever been used on one physical cpu, since vcpus
* can move around between pcpus. To cope with this, when
* a vcpu moves from one pcpu to another, we need to tell
* any vcpus running on the same core as this vcpu previously
* ran to flush the TLB. The TLB is shared between threads,
* so we use a single bit in .need_tlb_flush for all 4 threads.
*/
if (prev_cpu != pcpu) {
if (prev_cpu >= 0 &&
cpu_first_thread_sibling(prev_cpu) !=
cpu_first_thread_sibling(pcpu))
radix_flush_cpu(kvm, prev_cpu, vcpu);
if (nested)
nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu;
else
vcpu->arch.prev_cpu = pcpu;
}
}
static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc)
{
int cpu;
struct paca_struct *tpaca;
struct kvm *kvm = vc->kvm;
cpu = vc->pcpu;
if (vcpu) {
if (vcpu->arch.timer_running) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
vcpu->arch.timer_running = 0;
}
cpu += vcpu->arch.ptid;
vcpu->cpu = vc->pcpu;
vcpu->arch.thread_cpu = cpu;
cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest);
}
tpaca = paca_ptrs[cpu];
tpaca->kvm_hstate.kvm_vcpu = vcpu;
tpaca->kvm_hstate.ptid = cpu - vc->pcpu;
tpaca->kvm_hstate.fake_suspend = 0;
/* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */
smp_wmb();
tpaca->kvm_hstate.kvm_vcore = vc;
if (cpu != smp_processor_id())
kvmppc_ipi_thread(cpu);
}
static void kvmppc_wait_for_nap(int n_threads)
{
int cpu = smp_processor_id();
int i, loops;
if (n_threads <= 1)
return;
for (loops = 0; loops < 1000000; ++loops) {
/*
* Check if all threads are finished.
* We set the vcore pointer when starting a thread
* and the thread clears it when finished, so we look
* for any threads that still have a non-NULL vcore ptr.
*/
for (i = 1; i < n_threads; ++i)
if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
break;
if (i == n_threads) {
HMT_medium();
return;
}
HMT_low();
}
HMT_medium();
for (i = 1; i < n_threads; ++i)
if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore)
pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
}
/*
* Check that we are on thread 0 and that any other threads in
* this core are off-line. Then grab the threads so they can't
* enter the kernel.
*/
static int on_primary_thread(void)
{
int cpu = smp_processor_id();
int thr;
/* Are we on a primary subcore? */
if (cpu_thread_in_subcore(cpu))
return 0;
thr = 0;
while (++thr < threads_per_subcore)
if (cpu_online(cpu + thr))
return 0;
/* Grab all hw threads so they can't go into the kernel */
for (thr = 1; thr < threads_per_subcore; ++thr) {
if (kvmppc_grab_hwthread(cpu + thr)) {
/* Couldn't grab one; let the others go */
do {
kvmppc_release_hwthread(cpu + thr);
} while (--thr > 0);
return 0;
}
}
return 1;
}
/*
* A list of virtual cores for each physical CPU.
* These are vcores that could run but their runner VCPU tasks are
* (or may be) preempted.
*/
struct preempted_vcore_list {
struct list_head list;
spinlock_t lock;
};
static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores);
static void init_vcore_lists(void)
{
int cpu;
for_each_possible_cpu(cpu) {
struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu);
spin_lock_init(&lp->lock);
INIT_LIST_HEAD(&lp->list);
}
}
static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc)
{
struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
vc->vcore_state = VCORE_PREEMPT;
vc->pcpu = smp_processor_id();
if (vc->num_threads < threads_per_vcore(vc->kvm)) {
spin_lock(&lp->lock);
list_add_tail(&vc->preempt_list, &lp->list);
spin_unlock(&lp->lock);
}
/* Start accumulating stolen time */
kvmppc_core_start_stolen(vc);
}
static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc)
{
struct preempted_vcore_list *lp;
kvmppc_core_end_stolen(vc);
if (!list_empty(&vc->preempt_list)) {
lp = &per_cpu(preempted_vcores, vc->pcpu);
spin_lock(&lp->lock);
list_del_init(&vc->preempt_list);
spin_unlock(&lp->lock);
}
vc->vcore_state = VCORE_INACTIVE;
}
/*
* This stores information about the virtual cores currently
* assigned to a physical core.
*/
struct core_info {
int n_subcores;
int max_subcore_threads;
int total_threads;
int subcore_threads[MAX_SUBCORES];
struct kvmppc_vcore *vc[MAX_SUBCORES];
};
/*
* This mapping means subcores 0 and 1 can use threads 0-3 and 4-7
* respectively in 2-way micro-threading (split-core) mode on POWER8.
*/
static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 };
static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc)
{
memset(cip, 0, sizeof(*cip));
cip->n_subcores = 1;
cip->max_subcore_threads = vc->num_threads;
cip->total_threads = vc->num_threads;
cip->subcore_threads[0] = vc->num_threads;
cip->vc[0] = vc;
}
static bool subcore_config_ok(int n_subcores, int n_threads)
{
/*
* POWER9 "SMT4" cores are permanently in what is effectively a 4-way
* split-core mode, with one thread per subcore.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300))
return n_subcores <= 4 && n_threads == 1;
/* On POWER8, can only dynamically split if unsplit to begin with */
if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS)
return false;
if (n_subcores > MAX_SUBCORES)
return false;
if (n_subcores > 1) {
if (!(dynamic_mt_modes & 2))
n_subcores = 4;
if (n_subcores > 2 && !(dynamic_mt_modes & 4))
return false;
}
return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS;
}
static void init_vcore_to_run(struct kvmppc_vcore *vc)
{
vc->entry_exit_map = 0;
vc->in_guest = 0;
vc->napping_threads = 0;
vc->conferring_threads = 0;
vc->tb_offset_applied = 0;
}
static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip)
{
int n_threads = vc->num_threads;
int sub;
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return false;
/* In one_vm_per_core mode, require all vcores to be from the same vm */
if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm)
return false;
/* Some POWER9 chips require all threads to be in the same MMU mode */
if (no_mixing_hpt_and_radix &&
kvm_is_radix(vc->kvm) != kvm_is_radix(cip->vc[0]->kvm))
return false;
if (n_threads < cip->max_subcore_threads)
n_threads = cip->max_subcore_threads;
if (!subcore_config_ok(cip->n_subcores + 1, n_threads))
return false;
cip->max_subcore_threads = n_threads;
sub = cip->n_subcores;
++cip->n_subcores;
cip->total_threads += vc->num_threads;
cip->subcore_threads[sub] = vc->num_threads;
cip->vc[sub] = vc;
init_vcore_to_run(vc);
list_del_init(&vc->preempt_list);
return true;
}
/*
* Work out whether it is possible to piggyback the execution of
* vcore *pvc onto the execution of the other vcores described in *cip.
*/
static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip,
int target_threads)
{
if (cip->total_threads + pvc->num_threads > target_threads)
return false;
return can_dynamic_split(pvc, cip);
}
static void prepare_threads(struct kvmppc_vcore *vc)
{
int i;
struct kvm_vcpu *vcpu;
for_each_runnable_thread(i, vcpu, vc) {
if (signal_pending(vcpu->arch.run_task))
vcpu->arch.ret = -EINTR;
else if (vcpu->arch.vpa.update_pending ||
vcpu->arch.slb_shadow.update_pending ||
vcpu->arch.dtl.update_pending)
vcpu->arch.ret = RESUME_GUEST;
else
continue;
kvmppc_remove_runnable(vc, vcpu);
wake_up(&vcpu->arch.cpu_run);
}
}
static void collect_piggybacks(struct core_info *cip, int target_threads)
{
struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores);
struct kvmppc_vcore *pvc, *vcnext;
spin_lock(&lp->lock);
list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) {
if (!spin_trylock(&pvc->lock))
continue;
prepare_threads(pvc);
if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) {
list_del_init(&pvc->preempt_list);
if (pvc->runner == NULL) {
pvc->vcore_state = VCORE_INACTIVE;
kvmppc_core_end_stolen(pvc);
}
spin_unlock(&pvc->lock);
continue;
}
if (!can_piggyback(pvc, cip, target_threads)) {
spin_unlock(&pvc->lock);
continue;
}
kvmppc_core_end_stolen(pvc);
pvc->vcore_state = VCORE_PIGGYBACK;
if (cip->total_threads >= target_threads)
break;
}
spin_unlock(&lp->lock);
}
static bool recheck_signals_and_mmu(struct core_info *cip)
{
int sub, i;
struct kvm_vcpu *vcpu;
struct kvmppc_vcore *vc;
for (sub = 0; sub < cip->n_subcores; ++sub) {
vc = cip->vc[sub];
if (!vc->kvm->arch.mmu_ready)
return true;
for_each_runnable_thread(i, vcpu, vc)
if (signal_pending(vcpu->arch.run_task))
return true;
}
return false;
}
static void post_guest_process(struct kvmppc_vcore *vc, bool is_master)
{
int still_running = 0, i;
u64 now;
long ret;
struct kvm_vcpu *vcpu;
spin_lock(&vc->lock);
now = get_tb();
for_each_runnable_thread(i, vcpu, vc) {
/*
* It's safe to unlock the vcore in the loop here, because
* for_each_runnable_thread() is safe against removal of
* the vcpu, and the vcore state is VCORE_EXITING here,
* so any vcpus becoming runnable will have their arch.trap
* set to zero and can't actually run in the guest.
*/
spin_unlock(&vc->lock);
/* cancel pending dec exception if dec is positive */
if (now < vcpu->arch.dec_expires &&
kvmppc_core_pending_dec(vcpu))
kvmppc_core_dequeue_dec(vcpu);
trace_kvm_guest_exit(vcpu);
ret = RESUME_GUEST;
if (vcpu->arch.trap)
ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
vcpu->arch.run_task);
vcpu->arch.ret = ret;
vcpu->arch.trap = 0;
spin_lock(&vc->lock);
if (is_kvmppc_resume_guest(vcpu->arch.ret)) {
if (vcpu->arch.pending_exceptions)
kvmppc_core_prepare_to_enter(vcpu);
if (vcpu->arch.ceded)
kvmppc_set_timer(vcpu);
else
++still_running;
} else {
kvmppc_remove_runnable(vc, vcpu);
wake_up(&vcpu->arch.cpu_run);
}
}
if (!is_master) {
if (still_running > 0) {
kvmppc_vcore_preempt(vc);
} else if (vc->runner) {
vc->vcore_state = VCORE_PREEMPT;
kvmppc_core_start_stolen(vc);
} else {
vc->vcore_state = VCORE_INACTIVE;
}
if (vc->n_runnable > 0 && vc->runner == NULL) {
/* make sure there's a candidate runner awake */
i = -1;
vcpu = next_runnable_thread(vc, &i);
wake_up(&vcpu->arch.cpu_run);
}
}
spin_unlock(&vc->lock);
}
/*
* Clear core from the list of active host cores as we are about to
* enter the guest. Only do this if it is the primary thread of the
* core (not if a subcore) that is entering the guest.
*/
static inline int kvmppc_clear_host_core(unsigned int cpu)
{
int core;
if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
return 0;
/*
* Memory barrier can be omitted here as we will do a smp_wmb()
* later in kvmppc_start_thread and we need ensure that state is
* visible to other CPUs only after we enter guest.
*/
core = cpu >> threads_shift;
kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0;
return 0;
}
/*
* Advertise this core as an active host core since we exited the guest
* Only need to do this if it is the primary thread of the core that is
* exiting.
*/
static inline int kvmppc_set_host_core(unsigned int cpu)
{
int core;
if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu))
return 0;
/*
* Memory barrier can be omitted here because we do a spin_unlock
* immediately after this which provides the memory barrier.
*/
core = cpu >> threads_shift;
kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1;
return 0;
}
static void set_irq_happened(int trap)
{
switch (trap) {
case BOOK3S_INTERRUPT_EXTERNAL:
local_paca->irq_happened |= PACA_IRQ_EE;
break;
case BOOK3S_INTERRUPT_H_DOORBELL:
local_paca->irq_happened |= PACA_IRQ_DBELL;
break;
case BOOK3S_INTERRUPT_HMI:
local_paca->irq_happened |= PACA_IRQ_HMI;
break;
case BOOK3S_INTERRUPT_SYSTEM_RESET:
replay_system_reset();
break;
}
}
/*
* Run a set of guest threads on a physical core.
* Called with vc->lock held.
*/
static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu;
int i;
int srcu_idx;
struct core_info core_info;
struct kvmppc_vcore *pvc;
struct kvm_split_mode split_info, *sip;
int split, subcore_size, active;
int sub;
bool thr0_done;
unsigned long cmd_bit, stat_bit;
int pcpu, thr;
int target_threads;
int controlled_threads;
int trap;
bool is_power8;
bool hpt_on_radix;
/*
* Remove from the list any threads that have a signal pending
* or need a VPA update done
*/
prepare_threads(vc);
/* if the runner is no longer runnable, let the caller pick a new one */
if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
return;
/*
* Initialize *vc.
*/
init_vcore_to_run(vc);
vc->preempt_tb = TB_NIL;
/*
* Number of threads that we will be controlling: the same as
* the number of threads per subcore, except on POWER9,
* where it's 1 because the threads are (mostly) independent.
*/
controlled_threads = threads_per_vcore(vc->kvm);
/*
* Make sure we are running on primary threads, and that secondary
* threads are offline. Also check if the number of threads in this
* guest are greater than the current system threads per guest.
* On POWER9, we need to be not in independent-threads mode if
* this is a HPT guest on a radix host machine where the
* CPU threads may not be in different MMU modes.
*/
hpt_on_radix = no_mixing_hpt_and_radix && radix_enabled() &&
!kvm_is_radix(vc->kvm);
if (((controlled_threads > 1) &&
((vc->num_threads > threads_per_subcore) || !on_primary_thread())) ||
(hpt_on_radix && vc->kvm->arch.threads_indep)) {
for_each_runnable_thread(i, vcpu, vc) {
vcpu->arch.ret = -EBUSY;
kvmppc_remove_runnable(vc, vcpu);
wake_up(&vcpu->arch.cpu_run);
}
goto out;
}
/*
* See if we could run any other vcores on the physical core
* along with this one.
*/
init_core_info(&core_info, vc);
pcpu = smp_processor_id();
target_threads = controlled_threads;
if (target_smt_mode && target_smt_mode < target_threads)
target_threads = target_smt_mode;
if (vc->num_threads < target_threads)
collect_piggybacks(&core_info, target_threads);
/*
* On radix, arrange for TLB flushing if necessary.
* This has to be done before disabling interrupts since
* it uses smp_call_function().
*/
pcpu = smp_processor_id();
if (kvm_is_radix(vc->kvm)) {
for (sub = 0; sub < core_info.n_subcores; ++sub)
for_each_runnable_thread(i, vcpu, core_info.vc[sub])
kvmppc_prepare_radix_vcpu(vcpu, pcpu);
}
/*
* Hard-disable interrupts, and check resched flag and signals.
* If we need to reschedule or deliver a signal, clean up
* and return without going into the guest(s).
* If the mmu_ready flag has been cleared, don't go into the
* guest because that means a HPT resize operation is in progress.
*/
local_irq_disable();
hard_irq_disable();
if (lazy_irq_pending() || need_resched() ||
recheck_signals_and_mmu(&core_info)) {
local_irq_enable();
vc->vcore_state = VCORE_INACTIVE;
/* Unlock all except the primary vcore */
for (sub = 1; sub < core_info.n_subcores; ++sub) {
pvc = core_info.vc[sub];
/* Put back on to the preempted vcores list */
kvmppc_vcore_preempt(pvc);
spin_unlock(&pvc->lock);
}
for (i = 0; i < controlled_threads; ++i)
kvmppc_release_hwthread(pcpu + i);
return;
}
kvmppc_clear_host_core(pcpu);
/* Decide on micro-threading (split-core) mode */
subcore_size = threads_per_subcore;
cmd_bit = stat_bit = 0;
split = core_info.n_subcores;
sip = NULL;
is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S)
&& !cpu_has_feature(CPU_FTR_ARCH_300);
if (split > 1 || hpt_on_radix) {
sip = &split_info;
memset(&split_info, 0, sizeof(split_info));
for (sub = 0; sub < core_info.n_subcores; ++sub)
split_info.vc[sub] = core_info.vc[sub];
if (is_power8) {
if (split == 2 && (dynamic_mt_modes & 2)) {
cmd_bit = HID0_POWER8_1TO2LPAR;
stat_bit = HID0_POWER8_2LPARMODE;
} else {
split = 4;
cmd_bit = HID0_POWER8_1TO4LPAR;
stat_bit = HID0_POWER8_4LPARMODE;
}
subcore_size = MAX_SMT_THREADS / split;
split_info.rpr = mfspr(SPRN_RPR);
split_info.pmmar = mfspr(SPRN_PMMAR);
split_info.ldbar = mfspr(SPRN_LDBAR);
split_info.subcore_size = subcore_size;
} else {
split_info.subcore_size = 1;
if (hpt_on_radix) {
/* Use the split_info for LPCR/LPIDR changes */
split_info.lpcr_req = vc->lpcr;
split_info.lpidr_req = vc->kvm->arch.lpid;
split_info.host_lpcr = vc->kvm->arch.host_lpcr;
split_info.do_set = 1;
}
}
/* order writes to split_info before kvm_split_mode pointer */
smp_wmb();
}
for (thr = 0; thr < controlled_threads; ++thr) {
struct paca_struct *paca = paca_ptrs[pcpu + thr];
paca->kvm_hstate.tid = thr;
paca->kvm_hstate.napping = 0;
paca->kvm_hstate.kvm_split_mode = sip;
}
/* Initiate micro-threading (split-core) on POWER8 if required */
if (cmd_bit) {
unsigned long hid0 = mfspr(SPRN_HID0);
hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS;
mb();
mtspr(SPRN_HID0, hid0);
isync();
for (;;) {
hid0 = mfspr(SPRN_HID0);
if (hid0 & stat_bit)
break;
cpu_relax();
}
}
/*
* On POWER8, set RWMR register.
* Since it only affects PURR and SPURR, it doesn't affect
* the host, so we don't save/restore the host value.
*/
if (is_power8) {
unsigned long rwmr_val = RWMR_RPA_P8_8THREAD;
int n_online = atomic_read(&vc->online_count);
/*
* Use the 8-thread value if we're doing split-core
* or if the vcore's online count looks bogus.
*/
if (split == 1 && threads_per_subcore == MAX_SMT_THREADS &&
n_online >= 1 && n_online <= MAX_SMT_THREADS)
rwmr_val = p8_rwmr_values[n_online];
mtspr(SPRN_RWMR, rwmr_val);
}
/* Start all the threads */
active = 0;
for (sub = 0; sub < core_info.n_subcores; ++sub) {
thr = is_power8 ? subcore_thread_map[sub] : sub;
thr0_done = false;
active |= 1 << thr;
pvc = core_info.vc[sub];
pvc->pcpu = pcpu + thr;
for_each_runnable_thread(i, vcpu, pvc) {
kvmppc_start_thread(vcpu, pvc);
kvmppc_create_dtl_entry(vcpu, pvc);
trace_kvm_guest_enter(vcpu);
if (!vcpu->arch.ptid)
thr0_done = true;
active |= 1 << (thr + vcpu->arch.ptid);
}
/*
* We need to start the first thread of each subcore
* even if it doesn't have a vcpu.
*/
if (!thr0_done)
kvmppc_start_thread(NULL, pvc);
}
/*
* Ensure that split_info.do_nap is set after setting
* the vcore pointer in the PACA of the secondaries.
*/
smp_mb();
/*
* When doing micro-threading, poke the inactive threads as well.
* This gets them to the nap instruction after kvm_do_nap,
* which reduces the time taken to unsplit later.
* For POWER9 HPT guest on radix host, we need all the secondary
* threads woken up so they can do the LPCR/LPIDR change.
*/
if (cmd_bit || hpt_on_radix) {
split_info.do_nap = 1; /* ask secondaries to nap when done */
for (thr = 1; thr < threads_per_subcore; ++thr)
if (!(active & (1 << thr)))
kvmppc_ipi_thread(pcpu + thr);
}
vc->vcore_state = VCORE_RUNNING;
preempt_disable();
trace_kvmppc_run_core(vc, 0);
for (sub = 0; sub < core_info.n_subcores; ++sub)
spin_unlock(&core_info.vc[sub]->lock);
guest_enter_irqoff();
srcu_idx = srcu_read_lock(&vc->kvm->srcu);
this_cpu_disable_ftrace();
/*
* Interrupts will be enabled once we get into the guest,
* so tell lockdep that we're about to enable interrupts.
*/
trace_hardirqs_on();
trap = __kvmppc_vcore_entry();
trace_hardirqs_off();
this_cpu_enable_ftrace();
srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
set_irq_happened(trap);
spin_lock(&vc->lock);
/* prevent other vcpu threads from doing kvmppc_start_thread() now */
vc->vcore_state = VCORE_EXITING;
/* wait for secondary threads to finish writing their state to memory */
kvmppc_wait_for_nap(controlled_threads);
/* Return to whole-core mode if we split the core earlier */
if (cmd_bit) {
unsigned long hid0 = mfspr(SPRN_HID0);
unsigned long loops = 0;
hid0 &= ~HID0_POWER8_DYNLPARDIS;
stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE;
mb();
mtspr(SPRN_HID0, hid0);
isync();
for (;;) {
hid0 = mfspr(SPRN_HID0);
if (!(hid0 & stat_bit))
break;
cpu_relax();
++loops;
}
} else if (hpt_on_radix) {
/* Wait for all threads to have seen final sync */
for (thr = 1; thr < controlled_threads; ++thr) {
struct paca_struct *paca = paca_ptrs[pcpu + thr];
while (paca->kvm_hstate.kvm_split_mode) {
HMT_low();
barrier();
}
HMT_medium();
}
}
split_info.do_nap = 0;
kvmppc_set_host_core(pcpu);
local_irq_enable();
guest_exit();
/* Let secondaries go back to the offline loop */
for (i = 0; i < controlled_threads; ++i) {
kvmppc_release_hwthread(pcpu + i);
if (sip && sip->napped[i])
kvmppc_ipi_thread(pcpu + i);
cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest);
}
spin_unlock(&vc->lock);
/* make sure updates to secondary vcpu structs are visible now */
smp_mb();
preempt_enable();
for (sub = 0; sub < core_info.n_subcores; ++sub) {
pvc = core_info.vc[sub];
post_guest_process(pvc, pvc == vc);
}
spin_lock(&vc->lock);
out:
vc->vcore_state = VCORE_INACTIVE;
trace_kvmppc_run_core(vc, 1);
}
/*
* Load up hypervisor-mode registers on P9.
*/
static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
s64 hdec;
u64 tb, purr, spurr;
int trap;
unsigned long host_hfscr = mfspr(SPRN_HFSCR);
unsigned long host_ciabr = mfspr(SPRN_CIABR);
unsigned long host_dawr = mfspr(SPRN_DAWR);
unsigned long host_dawrx = mfspr(SPRN_DAWRX);
unsigned long host_psscr = mfspr(SPRN_PSSCR);
unsigned long host_pidr = mfspr(SPRN_PID);
hdec = time_limit - mftb();
if (hdec < 0)
return BOOK3S_INTERRUPT_HV_DECREMENTER;
mtspr(SPRN_HDEC, hdec);
if (vc->tb_offset) {
u64 new_tb = mftb() + vc->tb_offset;
mtspr(SPRN_TBU40, new_tb);
tb = mftb();
if ((tb & 0xffffff) < (new_tb & 0xffffff))
mtspr(SPRN_TBU40, new_tb + 0x1000000);
vc->tb_offset_applied = vc->tb_offset;
}
if (vc->pcr)
mtspr(SPRN_PCR, vc->pcr | PCR_MASK);
mtspr(SPRN_DPDES, vc->dpdes);
mtspr(SPRN_VTB, vc->vtb);
local_paca->kvm_hstate.host_purr = mfspr(SPRN_PURR);
local_paca->kvm_hstate.host_spurr = mfspr(SPRN_SPURR);
mtspr(SPRN_PURR, vcpu->arch.purr);
mtspr(SPRN_SPURR, vcpu->arch.spurr);
if (dawr_enabled()) {
mtspr(SPRN_DAWR, vcpu->arch.dawr);
mtspr(SPRN_DAWRX, vcpu->arch.dawrx);
}
mtspr(SPRN_CIABR, vcpu->arch.ciabr);
mtspr(SPRN_IC, vcpu->arch.ic);
mtspr(SPRN_PID, vcpu->arch.pid);
mtspr(SPRN_PSSCR, vcpu->arch.psscr | PSSCR_EC |
(local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
mtspr(SPRN_HFSCR, vcpu->arch.hfscr);
mtspr(SPRN_SPRG0, vcpu->arch.shregs.sprg0);
mtspr(SPRN_SPRG1, vcpu->arch.shregs.sprg1);
mtspr(SPRN_SPRG2, vcpu->arch.shregs.sprg2);
mtspr(SPRN_SPRG3, vcpu->arch.shregs.sprg3);
mtspr(SPRN_AMOR, ~0UL);
mtspr(SPRN_LPCR, lpcr);
isync();
kvmppc_xive_push_vcpu(vcpu);
mtspr(SPRN_SRR0, vcpu->arch.shregs.srr0);
mtspr(SPRN_SRR1, vcpu->arch.shregs.srr1);
trap = __kvmhv_vcpu_entry_p9(vcpu);
/* Advance host PURR/SPURR by the amount used by guest */
purr = mfspr(SPRN_PURR);
spurr = mfspr(SPRN_SPURR);
mtspr(SPRN_PURR, local_paca->kvm_hstate.host_purr +
purr - vcpu->arch.purr);
mtspr(SPRN_SPURR, local_paca->kvm_hstate.host_spurr +
spurr - vcpu->arch.spurr);
vcpu->arch.purr = purr;
vcpu->arch.spurr = spurr;
vcpu->arch.ic = mfspr(SPRN_IC);
vcpu->arch.pid = mfspr(SPRN_PID);
vcpu->arch.psscr = mfspr(SPRN_PSSCR) & PSSCR_GUEST_VIS;
vcpu->arch.shregs.sprg0 = mfspr(SPRN_SPRG0);
vcpu->arch.shregs.sprg1 = mfspr(SPRN_SPRG1);
vcpu->arch.shregs.sprg2 = mfspr(SPRN_SPRG2);
vcpu->arch.shregs.sprg3 = mfspr(SPRN_SPRG3);
/* Preserve PSSCR[FAKE_SUSPEND] until we've called kvmppc_save_tm_hv */
mtspr(SPRN_PSSCR, host_psscr |
(local_paca->kvm_hstate.fake_suspend << PSSCR_FAKE_SUSPEND_LG));
mtspr(SPRN_HFSCR, host_hfscr);
mtspr(SPRN_CIABR, host_ciabr);
mtspr(SPRN_DAWR, host_dawr);
mtspr(SPRN_DAWRX, host_dawrx);
mtspr(SPRN_PID, host_pidr);
/*
* Since this is radix, do a eieio; tlbsync; ptesync sequence in
* case we interrupted the guest between a tlbie and a ptesync.
*/
asm volatile("eieio; tlbsync; ptesync");
mtspr(SPRN_LPID, vcpu->kvm->arch.host_lpid); /* restore host LPID */
isync();
vc->dpdes = mfspr(SPRN_DPDES);
vc->vtb = mfspr(SPRN_VTB);
mtspr(SPRN_DPDES, 0);
if (vc->pcr)
mtspr(SPRN_PCR, PCR_MASK);
if (vc->tb_offset_applied) {
u64 new_tb = mftb() - vc->tb_offset_applied;
mtspr(SPRN_TBU40, new_tb);
tb = mftb();
if ((tb & 0xffffff) < (new_tb & 0xffffff))
mtspr(SPRN_TBU40, new_tb + 0x1000000);
vc->tb_offset_applied = 0;
}
mtspr(SPRN_HDEC, 0x7fffffff);
mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
return trap;
}
/*
* Virtual-mode guest entry for POWER9 and later when the host and
* guest are both using the radix MMU. The LPIDR has already been set.
*/
int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
unsigned long host_dscr = mfspr(SPRN_DSCR);
unsigned long host_tidr = mfspr(SPRN_TIDR);
unsigned long host_iamr = mfspr(SPRN_IAMR);
unsigned long host_amr = mfspr(SPRN_AMR);
s64 dec;
u64 tb;
int trap, save_pmu;
dec = mfspr(SPRN_DEC);
tb = mftb();
if (dec < 512)
return BOOK3S_INTERRUPT_HV_DECREMENTER;
local_paca->kvm_hstate.dec_expires = dec + tb;
if (local_paca->kvm_hstate.dec_expires < time_limit)
time_limit = local_paca->kvm_hstate.dec_expires;
vcpu->arch.ceded = 0;
kvmhv_save_host_pmu(); /* saves it to PACA kvm_hstate */
kvmppc_subcore_enter_guest();
vc->entry_exit_map = 1;
vc->in_guest = 1;
if (vcpu->arch.vpa.pinned_addr) {
struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
lp->yield_count = cpu_to_be32(yield_count);
vcpu->arch.vpa.dirty = 1;
}
if (cpu_has_feature(CPU_FTR_TM) ||
cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
kvmppc_restore_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
kvmhv_load_guest_pmu(vcpu);
msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
load_fp_state(&vcpu->arch.fp);
#ifdef CONFIG_ALTIVEC
load_vr_state(&vcpu->arch.vr);
#endif
mtspr(SPRN_VRSAVE, vcpu->arch.vrsave);
mtspr(SPRN_DSCR, vcpu->arch.dscr);
mtspr(SPRN_IAMR, vcpu->arch.iamr);
mtspr(SPRN_PSPB, vcpu->arch.pspb);
mtspr(SPRN_FSCR, vcpu->arch.fscr);
mtspr(SPRN_TAR, vcpu->arch.tar);
mtspr(SPRN_EBBHR, vcpu->arch.ebbhr);
mtspr(SPRN_EBBRR, vcpu->arch.ebbrr);
mtspr(SPRN_BESCR, vcpu->arch.bescr);
mtspr(SPRN_WORT, vcpu->arch.wort);
mtspr(SPRN_TIDR, vcpu->arch.tid);
mtspr(SPRN_DAR, vcpu->arch.shregs.dar);
mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr);
mtspr(SPRN_AMR, vcpu->arch.amr);
mtspr(SPRN_UAMOR, vcpu->arch.uamor);
if (!(vcpu->arch.ctrl & 1))
mtspr(SPRN_CTRLT, mfspr(SPRN_CTRLF) & ~1);
mtspr(SPRN_DEC, vcpu->arch.dec_expires - mftb());
if (kvmhv_on_pseries()) {
/*
* We need to save and restore the guest visible part of the
* psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor
* doesn't do this for us. Note only required if pseries since
* this is done in kvmhv_load_hv_regs_and_go() below otherwise.
*/
unsigned long host_psscr;
/* call our hypervisor to load up HV regs and go */
struct hv_guest_state hvregs;
host_psscr = mfspr(SPRN_PSSCR_PR);
mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr);
kvmhv_save_hv_regs(vcpu, &hvregs);
hvregs.lpcr = lpcr;
vcpu->arch.regs.msr = vcpu->arch.shregs.msr;
hvregs.version = HV_GUEST_STATE_VERSION;
if (vcpu->arch.nested) {
hvregs.lpid = vcpu->arch.nested->shadow_lpid;
hvregs.vcpu_token = vcpu->arch.nested_vcpu_id;
} else {
hvregs.lpid = vcpu->kvm->arch.lpid;
hvregs.vcpu_token = vcpu->vcpu_id;
}
hvregs.hdec_expiry = time_limit;
trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs),
__pa(&vcpu->arch.regs));
kvmhv_restore_hv_return_state(vcpu, &hvregs);
vcpu->arch.shregs.msr = vcpu->arch.regs.msr;
vcpu->arch.shregs.dar = mfspr(SPRN_DAR);
vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR);
vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR);
mtspr(SPRN_PSSCR_PR, host_psscr);
/* H_CEDE has to be handled now, not later */
if (trap == BOOK3S_INTERRUPT_SYSCALL && !vcpu->arch.nested &&
kvmppc_get_gpr(vcpu, 3) == H_CEDE) {
kvmppc_nested_cede(vcpu);
trap = 0;
}
} else {
trap = kvmhv_load_hv_regs_and_go(vcpu, time_limit, lpcr);
}
vcpu->arch.slb_max = 0;
dec = mfspr(SPRN_DEC);
if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */
dec = (s32) dec;
tb = mftb();
vcpu->arch.dec_expires = dec + tb;
vcpu->cpu = -1;
vcpu->arch.thread_cpu = -1;
vcpu->arch.ctrl = mfspr(SPRN_CTRLF);
vcpu->arch.iamr = mfspr(SPRN_IAMR);
vcpu->arch.pspb = mfspr(SPRN_PSPB);
vcpu->arch.fscr = mfspr(SPRN_FSCR);
vcpu->arch.tar = mfspr(SPRN_TAR);
vcpu->arch.ebbhr = mfspr(SPRN_EBBHR);
vcpu->arch.ebbrr = mfspr(SPRN_EBBRR);
vcpu->arch.bescr = mfspr(SPRN_BESCR);
vcpu->arch.wort = mfspr(SPRN_WORT);
vcpu->arch.tid = mfspr(SPRN_TIDR);
vcpu->arch.amr = mfspr(SPRN_AMR);
vcpu->arch.uamor = mfspr(SPRN_UAMOR);
vcpu->arch.dscr = mfspr(SPRN_DSCR);
mtspr(SPRN_PSPB, 0);
mtspr(SPRN_WORT, 0);
mtspr(SPRN_UAMOR, 0);
mtspr(SPRN_DSCR, host_dscr);
mtspr(SPRN_TIDR, host_tidr);
mtspr(SPRN_IAMR, host_iamr);
mtspr(SPRN_PSPB, 0);
if (host_amr != vcpu->arch.amr)
mtspr(SPRN_AMR, host_amr);
msr_check_and_set(MSR_FP | MSR_VEC | MSR_VSX);
store_fp_state(&vcpu->arch.fp);
#ifdef CONFIG_ALTIVEC
store_vr_state(&vcpu->arch.vr);
#endif
vcpu->arch.vrsave = mfspr(SPRN_VRSAVE);
if (cpu_has_feature(CPU_FTR_TM) ||
cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST))
kvmppc_save_tm_hv(vcpu, vcpu->arch.shregs.msr, true);
save_pmu = 1;
if (vcpu->arch.vpa.pinned_addr) {
struct lppaca *lp = vcpu->arch.vpa.pinned_addr;
u32 yield_count = be32_to_cpu(lp->yield_count) + 1;
lp->yield_count = cpu_to_be32(yield_count);
vcpu->arch.vpa.dirty = 1;
save_pmu = lp->pmcregs_in_use;
}
/* Must save pmu if this guest is capable of running nested guests */
save_pmu |= nesting_enabled(vcpu->kvm);
kvmhv_save_guest_pmu(vcpu, save_pmu);
vc->entry_exit_map = 0x101;
vc->in_guest = 0;
mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb());
mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
kvmhv_load_host_pmu();
kvmppc_subcore_exit_guest();
return trap;
}
/*
* Wait for some other vcpu thread to execute us, and
* wake us up when we need to handle something in the host.
*/
static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc,
struct kvm_vcpu *vcpu, int wait_state)
{
DEFINE_WAIT(wait);
prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
spin_unlock(&vc->lock);
schedule();
spin_lock(&vc->lock);
}
finish_wait(&vcpu->arch.cpu_run, &wait);
}
static void grow_halt_poll_ns(struct kvmppc_vcore *vc)
{
if (!halt_poll_ns_grow)
return;
vc->halt_poll_ns *= halt_poll_ns_grow;
if (vc->halt_poll_ns < halt_poll_ns_grow_start)
vc->halt_poll_ns = halt_poll_ns_grow_start;
}
static void shrink_halt_poll_ns(struct kvmppc_vcore *vc)
{
if (halt_poll_ns_shrink == 0)
vc->halt_poll_ns = 0;
else
vc->halt_poll_ns /= halt_poll_ns_shrink;
}
#ifdef CONFIG_KVM_XICS
static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
{
if (!xics_on_xive())
return false;
return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr <
vcpu->arch.xive_saved_state.cppr;
}
#else
static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu)
{
return false;
}
#endif /* CONFIG_KVM_XICS */
static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.pending_exceptions || vcpu->arch.prodded ||
kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu))
return true;
return false;
}
/*
* Check to see if any of the runnable vcpus on the vcore have pending
* exceptions or are no longer ceded
*/
static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc)
{
struct kvm_vcpu *vcpu;
int i;
for_each_runnable_thread(i, vcpu, vc) {
if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu))
return 1;
}
return 0;
}
/*
* All the vcpus in this vcore are idle, so wait for a decrementer
* or external interrupt to one of the vcpus. vc->lock is held.
*/
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
ktime_t cur, start_poll, start_wait;
int do_sleep = 1;
u64 block_ns;
DECLARE_SWAITQUEUE(wait);
/* Poll for pending exceptions and ceded state */
cur = start_poll = ktime_get();
if (vc->halt_poll_ns) {
ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
++vc->runner->stat.halt_attempted_poll;
vc->vcore_state = VCORE_POLLING;
spin_unlock(&vc->lock);
do {
if (kvmppc_vcore_check_block(vc)) {
do_sleep = 0;
break;
}
cur = ktime_get();
} while (single_task_running() && ktime_before(cur, stop));
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
if (!do_sleep) {
++vc->runner->stat.halt_successful_poll;
goto out;
}
}
prepare_to_swait_exclusive(&vc->wq, &wait, TASK_INTERRUPTIBLE);
if (kvmppc_vcore_check_block(vc)) {
finish_swait(&vc->wq, &wait);
do_sleep = 0;
/* If we polled, count this as a successful poll */
if (vc->halt_poll_ns)
++vc->runner->stat.halt_successful_poll;
goto out;
}
start_wait = ktime_get();
vc->vcore_state = VCORE_SLEEPING;
trace_kvmppc_vcore_blocked(vc, 0);
spin_unlock(&vc->lock);
schedule();
finish_swait(&vc->wq, &wait);
spin_lock(&vc->lock);
vc->vcore_state = VCORE_INACTIVE;
trace_kvmppc_vcore_blocked(vc, 1);
++vc->runner->stat.halt_successful_wait;
cur = ktime_get();
out:
block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll);
/* Attribute wait time */
if (do_sleep) {
vc->runner->stat.halt_wait_ns +=
ktime_to_ns(cur) - ktime_to_ns(start_wait);
/* Attribute failed poll time */
if (vc->halt_poll_ns)
vc->runner->stat.halt_poll_fail_ns +=
ktime_to_ns(start_wait) -
ktime_to_ns(start_poll);
} else {
/* Attribute successful poll time */
if (vc->halt_poll_ns)
vc->runner->stat.halt_poll_success_ns +=
ktime_to_ns(cur) -
ktime_to_ns(start_poll);
}
/* Adjust poll time */
if (halt_poll_ns) {
if (block_ns <= vc->halt_poll_ns)
;
/* We slept and blocked for longer than the max halt time */
else if (vc->halt_poll_ns && block_ns > halt_poll_ns)
shrink_halt_poll_ns(vc);
/* We slept and our poll time is too small */
else if (vc->halt_poll_ns < halt_poll_ns &&
block_ns < halt_poll_ns)
grow_halt_poll_ns(vc);
if (vc->halt_poll_ns > halt_poll_ns)
vc->halt_poll_ns = halt_poll_ns;
} else
vc->halt_poll_ns = 0;
trace_kvmppc_vcore_wakeup(do_sleep, block_ns);
}
/*
* This never fails for a radix guest, as none of the operations it does
* for a radix guest can fail or have a way to report failure.
* kvmhv_run_single_vcpu() relies on this fact.
*/
static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu)
{
int r = 0;
struct kvm *kvm = vcpu->kvm;
mutex_lock(&kvm->arch.mmu_setup_lock);
if (!kvm->arch.mmu_ready) {
if (!kvm_is_radix(kvm))
r = kvmppc_hv_setup_htab_rma(vcpu);
if (!r) {
if (cpu_has_feature(CPU_FTR_ARCH_300))
kvmppc_setup_partition_table(kvm);
kvm->arch.mmu_ready = 1;
}
}
mutex_unlock(&kvm->arch.mmu_setup_lock);
return r;
}
static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
int n_ceded, i, r;
struct kvmppc_vcore *vc;
struct kvm_vcpu *v;
trace_kvmppc_run_vcpu_enter(vcpu);
kvm_run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
kvmppc_update_vpas(vcpu);
/*
* Synchronize with other threads in this virtual core
*/
vc = vcpu->arch.vcore;
spin_lock(&vc->lock);
vcpu->arch.ceded = 0;
vcpu->arch.run_task = current;
vcpu->arch.kvm_run = kvm_run;
vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
vcpu->arch.busy_preempt = TB_NIL;
WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu);
++vc->n_runnable;
/*
* This happens the first time this is called for a vcpu.
* If the vcore is already running, we may be able to start
* this thread straight away and have it join in.
*/
if (!signal_pending(current)) {
if ((vc->vcore_state == VCORE_PIGGYBACK ||
vc->vcore_state == VCORE_RUNNING) &&
!VCORE_IS_EXITING(vc)) {
kvmppc_create_dtl_entry(vcpu, vc);
kvmppc_start_thread(vcpu, vc);
trace_kvm_guest_enter(vcpu);
} else if (vc->vcore_state == VCORE_SLEEPING) {
swake_up_one(&vc->wq);
}
}
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
!signal_pending(current)) {
/* See if the MMU is ready to go */
if (!vcpu->kvm->arch.mmu_ready) {
spin_unlock(&vc->lock);
r = kvmhv_setup_mmu(vcpu);
spin_lock(&vc->lock);
if (r) {
kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
kvm_run->fail_entry.
hardware_entry_failure_reason = 0;
vcpu->arch.ret = r;
break;
}
}
if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
kvmppc_vcore_end_preempt(vc);
if (vc->vcore_state != VCORE_INACTIVE) {
kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE);
continue;
}
for_each_runnable_thread(i, v, vc) {
kvmppc_core_prepare_to_enter(v);
if (signal_pending(v->arch.run_task)) {
kvmppc_remove_runnable(vc, v);
v->stat.signal_exits++;
v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
v->arch.ret = -EINTR;
wake_up(&v->arch.cpu_run);
}
}
if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
break;
n_ceded = 0;
for_each_runnable_thread(i, v, vc) {
if (!kvmppc_vcpu_woken(v))
n_ceded += v->arch.ceded;
else
v->arch.ceded = 0;
}
vc->runner = vcpu;
if (n_ceded == vc->n_runnable) {
kvmppc_vcore_blocked(vc);
} else if (need_resched()) {
kvmppc_vcore_preempt(vc);
/* Let something else run */
cond_resched_lock(&vc->lock);
if (vc->vcore_state == VCORE_PREEMPT)
kvmppc_vcore_end_preempt(vc);
} else {
kvmppc_run_core(vc);
}
vc->runner = NULL;
}
while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
(vc->vcore_state == VCORE_RUNNING ||
vc->vcore_state == VCORE_EXITING ||
vc->vcore_state == VCORE_PIGGYBACK))
kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE);
if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL)
kvmppc_vcore_end_preempt(vc);
if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
kvmppc_remove_runnable(vc, vcpu);
vcpu->stat.signal_exits++;
kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
}
if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
/* Wake up some vcpu to run the core */
i = -1;
v = next_runnable_thread(vc, &i);
wake_up(&v->arch.cpu_run);
}
trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
spin_unlock(&vc->lock);
return vcpu->arch.ret;
}
int kvmhv_run_single_vcpu(struct kvm_run *kvm_run,
struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
int trap, r, pcpu;
int srcu_idx, lpid;
struct kvmppc_vcore *vc;
struct kvm *kvm = vcpu->kvm;
struct kvm_nested_guest *nested = vcpu->arch.nested;
trace_kvmppc_run_vcpu_enter(vcpu);
kvm_run->exit_reason = 0;
vcpu->arch.ret = RESUME_GUEST;
vcpu->arch.trap = 0;
vc = vcpu->arch.vcore;
vcpu->arch.ceded = 0;
vcpu->arch.run_task = current;
vcpu->arch.kvm_run = kvm_run;
vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
vcpu->arch.busy_preempt = TB_NIL;
vcpu->arch.last_inst = KVM_INST_FETCH_FAILED;
vc->runnable_threads[0] = vcpu;
vc->n_runnable = 1;
vc->runner = vcpu;
/* See if the MMU is ready to go */
if (!kvm->arch.mmu_ready)
kvmhv_setup_mmu(vcpu);
if (need_resched())
cond_resched();
kvmppc_update_vpas(vcpu);
init_vcore_to_run(vc);
vc->preempt_tb = TB_NIL;
preempt_disable();
pcpu = smp_processor_id();
vc->pcpu = pcpu;
kvmppc_prepare_radix_vcpu(vcpu, pcpu);
local_irq_disable();
hard_irq_disable();
if (signal_pending(current))
goto sigpend;
if (lazy_irq_pending() || need_resched() || !kvm->arch.mmu_ready)
goto out;
if (!nested) {
kvmppc_core_prepare_to_enter(vcpu);
if (vcpu->arch.doorbell_request) {
vc->dpdes = 1;
smp_wmb();
vcpu->arch.doorbell_request = 0;
}
if (test_bit(BOOK3S_IRQPRIO_EXTERNAL,
&vcpu->arch.pending_exceptions))
lpcr |= LPCR_MER;
} else if (vcpu->arch.pending_exceptions ||
vcpu->arch.doorbell_request ||
xive_interrupt_pending(vcpu)) {
vcpu->arch.ret = RESUME_HOST;
goto out;
}
kvmppc_clear_host_core(pcpu);
local_paca->kvm_hstate.tid = 0;
local_paca->kvm_hstate.napping = 0;
local_paca->kvm_hstate.kvm_split_mode = NULL;
kvmppc_start_thread(vcpu, vc);
kvmppc_create_dtl_entry(vcpu, vc);
trace_kvm_guest_enter(vcpu);
vc->vcore_state = VCORE_RUNNING;
trace_kvmppc_run_core(vc, 0);
if (cpu_has_feature(CPU_FTR_HVMODE)) {
lpid = nested ? nested->shadow_lpid : kvm->arch.lpid;
mtspr(SPRN_LPID, lpid);
isync();
kvmppc_check_need_tlb_flush(kvm, pcpu, nested);
}
guest_enter_irqoff();
srcu_idx = srcu_read_lock(&kvm->srcu);
this_cpu_disable_ftrace();
/* Tell lockdep that we're about to enable interrupts */
trace_hardirqs_on();
trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr);
vcpu->arch.trap = trap;
trace_hardirqs_off();
this_cpu_enable_ftrace();
srcu_read_unlock(&kvm->srcu, srcu_idx);
if (cpu_has_feature(CPU_FTR_HVMODE)) {
mtspr(SPRN_LPID, kvm->arch.host_lpid);
isync();
}
set_irq_happened(trap);
kvmppc_set_host_core(pcpu);
local_irq_enable();
guest_exit();
cpumask_clear_cpu(pcpu, &kvm->arch.cpu_in_guest);
preempt_enable();
/*
* cancel pending decrementer exception if DEC is now positive, or if
* entering a nested guest in which case the decrementer is now owned
* by L2 and the L1 decrementer is provided in hdec_expires
*/
if (kvmppc_core_pending_dec(vcpu) &&
((get_tb() < vcpu->arch.dec_expires) ||
(trap == BOOK3S_INTERRUPT_SYSCALL &&
kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED)))
kvmppc_core_dequeue_dec(vcpu);
trace_kvm_guest_exit(vcpu);
r = RESUME_GUEST;
if (trap) {
if (!nested)
r = kvmppc_handle_exit_hv(kvm_run, vcpu, current);
else
r = kvmppc_handle_nested_exit(kvm_run, vcpu);
}
vcpu->arch.ret = r;
if (is_kvmppc_resume_guest(r) && vcpu->arch.ceded &&
!kvmppc_vcpu_woken(vcpu)) {
kvmppc_set_timer(vcpu);
while (vcpu->arch.ceded && !kvmppc_vcpu_woken(vcpu)) {
if (signal_pending(current)) {
vcpu->stat.signal_exits++;
kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
break;
}
spin_lock(&vc->lock);
kvmppc_vcore_blocked(vc);
spin_unlock(&vc->lock);
}
}
vcpu->arch.ceded = 0;
vc->vcore_state = VCORE_INACTIVE;
trace_kvmppc_run_core(vc, 1);
done:
kvmppc_remove_runnable(vc, vcpu);
trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
return vcpu->arch.ret;
sigpend:
vcpu->stat.signal_exits++;
kvm_run->exit_reason = KVM_EXIT_INTR;
vcpu->arch.ret = -EINTR;
out:
local_irq_enable();
preempt_enable();
goto done;
}
static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
int r;
int srcu_idx;
unsigned long ebb_regs[3] = {}; /* shut up GCC */
unsigned long user_tar = 0;
unsigned int user_vrsave;
struct kvm *kvm;
if (!vcpu->arch.sane) {
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
return -EINVAL;
}
/*
* Don't allow entry with a suspended transaction, because
* the guest entry/exit code will lose it.
* If the guest has TM enabled, save away their TM-related SPRs
* (they will get restored by the TM unavailable interrupt).
*/
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs &&
(current->thread.regs->msr & MSR_TM)) {
if (MSR_TM_ACTIVE(current->thread.regs->msr)) {
run->exit_reason = KVM_EXIT_FAIL_ENTRY;
run->fail_entry.hardware_entry_failure_reason = 0;
return -EINVAL;
}
/* Enable TM so we can read the TM SPRs */
mtmsr(mfmsr() | MSR_TM);
current->thread.tm_tfhar = mfspr(SPRN_TFHAR);
current->thread.tm_tfiar = mfspr(SPRN_TFIAR);
current->thread.tm_texasr = mfspr(SPRN_TEXASR);
current->thread.regs->msr &= ~MSR_TM;
}
#endif
/*
* Force online to 1 for the sake of old userspace which doesn't
* set it.
*/
if (!vcpu->arch.online) {
atomic_inc(&vcpu->arch.vcore->online_count);
vcpu->arch.online = 1;
}
kvmppc_core_prepare_to_enter(vcpu);
/* No need to go into the guest when all we'll do is come back out */
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
kvm = vcpu->kvm;
atomic_inc(&kvm->arch.vcpus_running);
/* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */
smp_mb();
flush_all_to_thread(current);
/* Save userspace EBB and other register values */
if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
ebb_regs[0] = mfspr(SPRN_EBBHR);
ebb_regs[1] = mfspr(SPRN_EBBRR);
ebb_regs[2] = mfspr(SPRN_BESCR);
user_tar = mfspr(SPRN_TAR);
}
user_vrsave = mfspr(SPRN_VRSAVE);
vcpu->arch.wqp = &vcpu->arch.vcore->wq;
vcpu->arch.pgdir = current->mm->pgd;
vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
do {
/*
* The early POWER9 chips that can't mix radix and HPT threads
* on the same core also need the workaround for the problem
* where the TLB would prefetch entries in the guest exit path
* for radix guests using the guest PIDR value and LPID 0.
* The workaround is in the old path (kvmppc_run_vcpu())
* but not the new path (kvmhv_run_single_vcpu()).
*/
if (kvm->arch.threads_indep && kvm_is_radix(kvm) &&
!no_mixing_hpt_and_radix)
r = kvmhv_run_single_vcpu(run, vcpu, ~(u64)0,
vcpu->arch.vcore->lpcr);
else
r = kvmppc_run_vcpu(run, vcpu);
if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
!(vcpu->arch.shregs.msr & MSR_PR)) {
trace_kvm_hcall_enter(vcpu);
r = kvmppc_pseries_do_hcall(vcpu);
trace_kvm_hcall_exit(vcpu, r);
kvmppc_core_prepare_to_enter(vcpu);
} else if (r == RESUME_PAGE_FAULT) {
srcu_idx = srcu_read_lock(&kvm->srcu);
r = kvmppc_book3s_hv_page_fault(run, vcpu,
vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
srcu_read_unlock(&kvm->srcu, srcu_idx);
} else if (r == RESUME_PASSTHROUGH) {
if (WARN_ON(xics_on_xive()))
r = H_SUCCESS;
else
r = kvmppc_xics_rm_complete(vcpu, 0);
}
} while (is_kvmppc_resume_guest(r));
/* Restore userspace EBB and other register values */
if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
mtspr(SPRN_EBBHR, ebb_regs[0]);
mtspr(SPRN_EBBRR, ebb_regs[1]);
mtspr(SPRN_BESCR, ebb_regs[2]);
mtspr(SPRN_TAR, user_tar);
mtspr(SPRN_FSCR, current->thread.fscr);
}
mtspr(SPRN_VRSAVE, user_vrsave);
vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
atomic_dec(&kvm->arch.vcpus_running);
return r;
}
static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
int shift, int sllp)
{
(*sps)->page_shift = shift;
(*sps)->slb_enc = sllp;
(*sps)->enc[0].page_shift = shift;
(*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift);
/*
* Add 16MB MPSS support (may get filtered out by userspace)
*/
if (shift != 24) {
int penc = kvmppc_pgsize_lp_encoding(shift, 24);
if (penc != -1) {
(*sps)->enc[1].page_shift = 24;
(*sps)->enc[1].pte_enc = penc;
}
}
(*sps)++;
}
static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
struct kvm_ppc_smmu_info *info)
{
struct kvm_ppc_one_seg_page_size *sps;
/*
* POWER7, POWER8 and POWER9 all support 32 storage keys for data.
* POWER7 doesn't support keys for instruction accesses,
* POWER8 and POWER9 do.
*/
info->data_keys = 32;
info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0;
/* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */
info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS;
info->slb_size = 32;
/* We only support these sizes for now, and no muti-size segments */
sps = &info->sps[0];
kvmppc_add_seg_page_size(&sps, 12, 0);
kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
/* If running as a nested hypervisor, we don't support HPT guests */
if (kvmhv_on_pseries())
info->flags |= KVM_PPC_NO_HASH;
return 0;
}
/*
* Get (and clear) the dirty memory log for a memory slot.
*/
static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
struct kvm_dirty_log *log)
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
int i, r;
unsigned long n;
unsigned long *buf, *p;
struct kvm_vcpu *vcpu;
mutex_lock(&kvm->slots_lock);
r = -EINVAL;
if (log->slot >= KVM_USER_MEM_SLOTS)
goto out;
slots = kvm_memslots(kvm);
memslot = id_to_memslot(slots, log->slot);
r = -ENOENT;
if (!memslot->dirty_bitmap)
goto out;
/*
* Use second half of bitmap area because both HPT and radix
* accumulate bits in the first half.
*/
n = kvm_dirty_bitmap_bytes(memslot);
buf = memslot->dirty_bitmap + n / sizeof(long);
memset(buf, 0, n);
if (kvm_is_radix(kvm))
r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf);
else
r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf);
if (r)
goto out;
/*
* We accumulate dirty bits in the first half of the
* memslot's dirty_bitmap area, for when pages are paged
* out or modified by the host directly. Pick up these
* bits and add them to the map.
*/
p = memslot->dirty_bitmap;
for (i = 0; i < n / sizeof(long); ++i)
buf[i] |= xchg(&p[i], 0);
/* Harvest dirty bits from VPA and DTL updates */
/* Note: we never modify the SLB shadow buffer areas */
kvm_for_each_vcpu(i, vcpu, kvm) {
spin_lock(&vcpu->arch.vpa_update_lock);
kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf);
kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf);
spin_unlock(&vcpu->arch.vpa_update_lock);
}
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, buf, n))
goto out;
r = 0;
out:
mutex_unlock(&kvm->slots_lock);
return r;
}
static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
if (!dont || free->arch.rmap != dont->arch.rmap) {
vfree(free->arch.rmap);
free->arch.rmap = NULL;
}
}
static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
unsigned long npages)
{
slot->arch.rmap = vzalloc(array_size(npages, sizeof(*slot->arch.rmap)));
if (!slot->arch.rmap)
return -ENOMEM;
return 0;
}
static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
struct kvm_memory_slot *memslot,
const struct kvm_userspace_memory_region *mem)
{
return 0;
}
static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
const struct kvm_userspace_memory_region *mem,
const struct kvm_memory_slot *old,
const struct kvm_memory_slot *new,
enum kvm_mr_change change)
{
unsigned long npages = mem->memory_size >> PAGE_SHIFT;
/*
* If we are making a new memslot, it might make
* some address that was previously cached as emulated
* MMIO be no longer emulated MMIO, so invalidate
* all the caches of emulated MMIO translations.
*/
if (npages)
atomic64_inc(&kvm->arch.mmio_update);
/*
* For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels
* have already called kvm_arch_flush_shadow_memslot() to
* flush shadow mappings. For KVM_MR_CREATE we have no
* previous mappings. So the only case to handle is
* KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit
* has been changed.
* For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES
* to get rid of any THP PTEs in the partition-scoped page tables
* so we can track dirtiness at the page level; we flush when
* clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to
* using THP PTEs.
*/
if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) &&
((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES))
kvmppc_radix_flush_memslot(kvm, old);
}
/*
* Update LPCR values in kvm->arch and in vcores.
* Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion
* of kvm->arch.lpcr update).
*/
void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
{
long int i;
u32 cores_done = 0;
if ((kvm->arch.lpcr & mask) == lpcr)
return;
kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;
for (i = 0; i < KVM_MAX_VCORES; ++i) {
struct kvmppc_vcore *vc = kvm->arch.vcores[i];
if (!vc)
continue;
spin_lock(&vc->lock);
vc->lpcr = (vc->lpcr & ~mask) | lpcr;
spin_unlock(&vc->lock);
if (++cores_done >= kvm->arch.online_vcores)
break;
}
}
static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
{
return;
}
void kvmppc_setup_partition_table(struct kvm *kvm)
{
unsigned long dw0, dw1;
if (!kvm_is_radix(kvm)) {
/* PS field - page size for VRMA */
dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) |
((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1);
/* HTABSIZE and HTABORG fields */
dw0 |= kvm->arch.sdr1;
/* Second dword as set by userspace */
dw1 = kvm->arch.process_table;
} else {
dw0 = PATB_HR | radix__get_tree_size() |
__pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE;
dw1 = PATB_GR | kvm->arch.process_table;
}
kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1);
}
/*
* Set up HPT (hashed page table) and RMA (real-mode area).
* Must be called with kvm->arch.mmu_setup_lock held.
*/
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
{
int err = 0;
struct kvm *kvm = vcpu->kvm;
unsigned long hva;
struct kvm_memory_slot *memslot;
struct vm_area_struct *vma;
unsigned long lpcr = 0, senc;
unsigned long psize, porder;
int srcu_idx;
/* Allocate hashed page table (if not done already) and reset it */
if (!kvm->arch.hpt.virt) {
int order = KVM_DEFAULT_HPT_ORDER;
struct kvm_hpt_info info;
err = kvmppc_allocate_hpt(&info, order);
/* If we get here, it means userspace didn't specify a
* size explicitly. So, try successively smaller
* sizes if the default failed. */
while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER)
err = kvmppc_allocate_hpt(&info, order);
if (err < 0) {
pr_err("KVM: Couldn't alloc HPT\n");
goto out;
}
kvmppc_set_hpt(kvm, &info);
}
/* Look up the memslot for guest physical address 0 */
srcu_idx = srcu_read_lock(&kvm->srcu);
memslot = gfn_to_memslot(kvm, 0);
/* We must have some memory at 0 by now */
err = -EINVAL;
if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
goto out_srcu;
/* Look up the VMA for the start of this memory slot */
hva = memslot->userspace_addr;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, hva);
if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
goto up_out;
psize = vma_kernel_pagesize(vma);
up_read(&current->mm->mmap_sem);
/* We can handle 4k, 64k or 16M pages in the VRMA */
if (psize >= 0x1000000)
psize = 0x1000000;
else if (psize >= 0x10000)
psize = 0x10000;
else
psize = 0x1000;
porder = __ilog2(psize);
senc = slb_pgsize_encoding(psize);
kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
/* Create HPTEs in the hash page table for the VRMA */
kvmppc_map_vrma(vcpu, memslot, porder);
/* Update VRMASD field in the LPCR */
if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
/* the -4 is to account for senc values starting at 0x10 */
lpcr = senc << (LPCR_VRMASD_SH - 4);
kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
}
/* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */
smp_wmb();
err = 0;
out_srcu:
srcu_read_unlock(&kvm->srcu, srcu_idx);
out:
return err;
up_out:
up_read(&current->mm->mmap_sem);
goto out_srcu;
}
/*
* Must be called with kvm->arch.mmu_setup_lock held and
* mmu_ready = 0 and no vcpus running.
*/
int kvmppc_switch_mmu_to_hpt(struct kvm *kvm)
{
if (nesting_enabled(kvm))
kvmhv_release_all_nested(kvm);
kvmppc_rmap_reset(kvm);
kvm->arch.process_table = 0;
/* Mutual exclusion with kvm_unmap_hva_range etc. */
spin_lock(&kvm->mmu_lock);
kvm->arch.radix = 0;
spin_unlock(&kvm->mmu_lock);
kvmppc_free_radix(kvm);
kvmppc_update_lpcr(kvm, LPCR_VPM1,
LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
return 0;
}
/*
* Must be called with kvm->arch.mmu_setup_lock held and
* mmu_ready = 0 and no vcpus running.
*/
int kvmppc_switch_mmu_to_radix(struct kvm *kvm)
{
int err;
err = kvmppc_init_vm_radix(kvm);
if (err)
return err;
kvmppc_rmap_reset(kvm);
/* Mutual exclusion with kvm_unmap_hva_range etc. */
spin_lock(&kvm->mmu_lock);
kvm->arch.radix = 1;
spin_unlock(&kvm->mmu_lock);
kvmppc_free_hpt(&kvm->arch.hpt);
kvmppc_update_lpcr(kvm, LPCR_UPRT | LPCR_GTSE | LPCR_HR,
LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR);
return 0;
}
#ifdef CONFIG_KVM_XICS
/*
* Allocate a per-core structure for managing state about which cores are
* running in the host versus the guest and for exchanging data between
* real mode KVM and CPU running in the host.
* This is only done for the first VM.
* The allocated structure stays even if all VMs have stopped.
* It is only freed when the kvm-hv module is unloaded.
* It's OK for this routine to fail, we just don't support host
* core operations like redirecting H_IPI wakeups.
*/
void kvmppc_alloc_host_rm_ops(void)
{
struct kvmppc_host_rm_ops *ops;
unsigned long l_ops;
int cpu, core;
int size;
/* Not the first time here ? */
if (kvmppc_host_rm_ops_hv != NULL)
return;
ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL);
if (!ops)
return;
size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core);
ops->rm_core = kzalloc(size, GFP_KERNEL);
if (!ops->rm_core) {
kfree(ops);
return;
}
cpus_read_lock();
for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) {
if (!cpu_online(cpu))
continue;
core = cpu >> threads_shift;
ops->rm_core[core].rm_state.in_host = 1;
}
ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv;
/*
* Make the contents of the kvmppc_host_rm_ops structure visible
* to other CPUs before we assign it to the global variable.
* Do an atomic assignment (no locks used here), but if someone
* beats us to it, just free our copy and return.
*/
smp_wmb();
l_ops = (unsigned long) ops;
if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) {
cpus_read_unlock();
kfree(ops->rm_core);
kfree(ops);
return;
}
cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE,
"ppc/kvm_book3s:prepare",
kvmppc_set_host_core,
kvmppc_clear_host_core);
cpus_read_unlock();
}
void kvmppc_free_host_rm_ops(void)
{
if (kvmppc_host_rm_ops_hv) {
cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE);
kfree(kvmppc_host_rm_ops_hv->rm_core);
kfree(kvmppc_host_rm_ops_hv);
kvmppc_host_rm_ops_hv = NULL;
}
}
#endif
static int kvmppc_core_init_vm_hv(struct kvm *kvm)
{
unsigned long lpcr, lpid;
char buf[32];
int ret;
mutex_init(&kvm->arch.mmu_setup_lock);
/* Allocate the guest's logical partition ID */
lpid = kvmppc_alloc_lpid();
if ((long)lpid < 0)
return -ENOMEM;
kvm->arch.lpid = lpid;
kvmppc_alloc_host_rm_ops();
kvmhv_vm_nested_init(kvm);
/*
* Since we don't flush the TLB when tearing down a VM,
* and this lpid might have previously been used,
* make sure we flush on each core before running the new VM.
* On POWER9, the tlbie in mmu_partition_table_set_entry()
* does this flush for us.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300))
cpumask_setall(&kvm->arch.need_tlb_flush);
/* Start out with the default set of hcalls enabled */
memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
sizeof(kvm->arch.enabled_hcalls));
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
/* Init LPCR for virtual RMA mode */
if (cpu_has_feature(CPU_FTR_HVMODE)) {
kvm->arch.host_lpid = mfspr(SPRN_LPID);
kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
lpcr &= LPCR_PECE | LPCR_LPES;
} else {
lpcr = 0;
}
lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
LPCR_VPM0 | LPCR_VPM1;
kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
(VRMA_VSID << SLB_VSID_SHIFT_1T);
/* On POWER8 turn on online bit to enable PURR/SPURR */
if (cpu_has_feature(CPU_FTR_ARCH_207S))
lpcr |= LPCR_ONL;
/*
* On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed)
* Set HVICE bit to enable hypervisor virtualization interrupts.
* Set HEIC to prevent OS interrupts to go to hypervisor (should
* be unnecessary but better safe than sorry in case we re-enable
* EE in HV mode with this LPCR still set)
*/
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
lpcr &= ~LPCR_VPM0;
lpcr |= LPCR_HVICE | LPCR_HEIC;
/*
* If xive is enabled, we route 0x500 interrupts directly
* to the guest.
*/
if (xics_on_xive())
lpcr |= LPCR_LPES;
}
/*
* If the host uses radix, the guest starts out as radix.
*/
if (radix_enabled()) {
kvm->arch.radix = 1;
kvm->arch.mmu_ready = 1;
lpcr &= ~LPCR_VPM1;
lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
ret = kvmppc_init_vm_radix(kvm);
if (ret) {
kvmppc_free_lpid(kvm->arch.lpid);
return ret;
}
kvmppc_setup_partition_table(kvm);
}
kvm->arch.lpcr = lpcr;
/* Initialization for future HPT resizes */
kvm->arch.resize_hpt = NULL;
/*
* Work out how many sets the TLB has, for the use of
* the TLB invalidation loop in book3s_hv_rmhandlers.S.
*/
if (radix_enabled())
kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */
else if (cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */
else if (cpu_has_feature(CPU_FTR_ARCH_207S))
kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */
else
kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */
/*
* Track that we now have a HV mode VM active. This blocks secondary
* CPU threads from coming online.
* On POWER9, we only need to do this if the "indep_threads_mode"
* module parameter has been set to N.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (!indep_threads_mode && !cpu_has_feature(CPU_FTR_HVMODE)) {
pr_warn("KVM: Ignoring indep_threads_mode=N in nested hypervisor\n");
kvm->arch.threads_indep = true;
} else {
kvm->arch.threads_indep = indep_threads_mode;
}
}
if (!kvm->arch.threads_indep)
kvm_hv_vm_activated();
/*
* Initialize smt_mode depending on processor.
* POWER8 and earlier have to use "strict" threading, where
* all vCPUs in a vcore have to run on the same (sub)core,
* whereas on POWER9 the threads can each run a different
* guest.
*/
if (!cpu_has_feature(CPU_FTR_ARCH_300))
kvm->arch.smt_mode = threads_per_subcore;
else
kvm->arch.smt_mode = 1;
kvm->arch.emul_smt_mode = 1;
/*
* Create a debugfs directory for the VM
*/
snprintf(buf, sizeof(buf), "vm%d", current->pid);
kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
kvmppc_mmu_debugfs_init(kvm);
if (radix_enabled())
kvmhv_radix_debugfs_init(kvm);
return 0;
}
static void kvmppc_free_vcores(struct kvm *kvm)
{
long int i;
for (i = 0; i < KVM_MAX_VCORES; ++i)
kfree(kvm->arch.vcores[i]);
kvm->arch.online_vcores = 0;
}
static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
{
debugfs_remove_recursive(kvm->arch.debugfs_dir);
if (!kvm->arch.threads_indep)
kvm_hv_vm_deactivated();
kvmppc_free_vcores(kvm);
if (kvm_is_radix(kvm))
kvmppc_free_radix(kvm);
else
kvmppc_free_hpt(&kvm->arch.hpt);
/* Perform global invalidation and return lpid to the pool */
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (nesting_enabled(kvm))
kvmhv_release_all_nested(kvm);
kvm->arch.process_table = 0;
kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0);
}
kvmppc_free_lpid(kvm->arch.lpid);
kvmppc_free_pimap(kvm);
}
/* We don't need to emulate any privileged instructions or dcbz */
static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int inst, int *advance)
{
return EMULATE_FAIL;
}
static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
ulong spr_val)
{
return EMULATE_FAIL;
}
static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
ulong *spr_val)
{
return EMULATE_FAIL;
}
static int kvmppc_core_check_processor_compat_hv(void)
{
if (cpu_has_feature(CPU_FTR_HVMODE) &&
cpu_has_feature(CPU_FTR_ARCH_206))
return 0;
/* POWER9 in radix mode is capable of being a nested hypervisor. */
if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
return 0;
return -EIO;
}
#ifdef CONFIG_KVM_XICS
void kvmppc_free_pimap(struct kvm *kvm)
{
kfree(kvm->arch.pimap);
}
static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void)
{
return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL);
}
static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
{
struct irq_desc *desc;
struct kvmppc_irq_map *irq_map;
struct kvmppc_passthru_irqmap *pimap;
struct irq_chip *chip;
int i, rc = 0;
if (!kvm_irq_bypass)
return 1;
desc = irq_to_desc(host_irq);
if (!desc)
return -EIO;
mutex_lock(&kvm->lock);
pimap = kvm->arch.pimap;
if (pimap == NULL) {
/* First call, allocate structure to hold IRQ map */
pimap = kvmppc_alloc_pimap();
if (pimap == NULL) {
mutex_unlock(&kvm->lock);
return -ENOMEM;
}
kvm->arch.pimap = pimap;
}
/*
* For now, we only support interrupts for which the EOI operation
* is an OPAL call followed by a write to XIRR, since that's
* what our real-mode EOI code does, or a XIVE interrupt
*/
chip = irq_data_get_irq_chip(&desc->irq_data);
if (!chip || !(is_pnv_opal_msi(chip) || is_xive_irq(chip))) {
pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n",
host_irq, guest_gsi);
mutex_unlock(&kvm->lock);
return -ENOENT;
}
/*
* See if we already have an entry for this guest IRQ number.
* If it's mapped to a hardware IRQ number, that's an error,
* otherwise re-use this entry.
*/
for (i = 0; i < pimap->n_mapped; i++) {
if (guest_gsi == pimap->mapped[i].v_hwirq) {
if (pimap->mapped[i].r_hwirq) {
mutex_unlock(&kvm->lock);
return -EINVAL;
}
break;
}
}
if (i == KVMPPC_PIRQ_MAPPED) {
mutex_unlock(&kvm->lock);
return -EAGAIN; /* table is full */
}
irq_map = &pimap->mapped[i];
irq_map->v_hwirq = guest_gsi;
irq_map->desc = desc;
/*
* Order the above two stores before the next to serialize with
* the KVM real mode handler.
*/
smp_wmb();
irq_map->r_hwirq = desc->irq_data.hwirq;
if (i == pimap->n_mapped)
pimap->n_mapped++;
if (xics_on_xive())
rc = kvmppc_xive_set_mapped(kvm, guest_gsi, desc);
else
kvmppc_xics_set_mapped(kvm, guest_gsi, desc->irq_data.hwirq);
if (rc)
irq_map->r_hwirq = 0;
mutex_unlock(&kvm->lock);
return 0;
}
static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi)
{
struct irq_desc *desc;
struct kvmppc_passthru_irqmap *pimap;
int i, rc = 0;
if (!kvm_irq_bypass)
return 0;
desc = irq_to_desc(host_irq);
if (!desc)
return -EIO;
mutex_lock(&kvm->lock);
if (!kvm->arch.pimap)
goto unlock;
pimap = kvm->arch.pimap;
for (i = 0; i < pimap->n_mapped; i++) {
if (guest_gsi == pimap->mapped[i].v_hwirq)
break;
}
if (i == pimap->n_mapped) {
mutex_unlock(&kvm->lock);
return -ENODEV;
}
if (xics_on_xive())
rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, pimap->mapped[i].desc);
else
kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq);
/* invalidate the entry (what do do on error from the above ?) */
pimap->mapped[i].r_hwirq = 0;
/*
* We don't free this structure even when the count goes to
* zero. The structure is freed when we destroy the VM.
*/
unlock:
mutex_unlock(&kvm->lock);
return rc;
}
static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
int ret = 0;
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
irqfd->producer = prod;
ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
if (ret)
pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n",
prod->irq, irqfd->gsi, ret);
return ret;
}
static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
int ret;
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
irqfd->producer = NULL;
/*
* When producer of consumer is unregistered, we change back to
* default external interrupt handling mode - KVM real mode
* will switch back to host.
*/
ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi);
if (ret)
pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n",
prod->irq, irqfd->gsi, ret);
}
#endif
static long kvm_arch_vm_ioctl_hv(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm __maybe_unused = filp->private_data;
void __user *argp = (void __user *)arg;
long r;
switch (ioctl) {
case KVM_PPC_ALLOCATE_HTAB: {
u32 htab_order;
r = -EFAULT;
if (get_user(htab_order, (u32 __user *)argp))
break;
r = kvmppc_alloc_reset_hpt(kvm, htab_order);
if (r)
break;
r = 0;
break;
}
case KVM_PPC_GET_HTAB_FD: {
struct kvm_get_htab_fd ghf;
r = -EFAULT;
if (copy_from_user(&ghf, argp, sizeof(ghf)))
break;
r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
break;
}
case KVM_PPC_RESIZE_HPT_PREPARE: {
struct kvm_ppc_resize_hpt rhpt;
r = -EFAULT;
if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
break;
r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt);
break;
}
case KVM_PPC_RESIZE_HPT_COMMIT: {
struct kvm_ppc_resize_hpt rhpt;
r = -EFAULT;
if (copy_from_user(&rhpt, argp, sizeof(rhpt)))
break;
r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt);
break;
}
default:
r = -ENOTTY;
}
return r;
}
/*
* List of hcall numbers to enable by default.
* For compatibility with old userspace, we enable by default
* all hcalls that were implemented before the hcall-enabling
* facility was added. Note this list should not include H_RTAS.
*/
static unsigned int default_hcall_list[] = {
H_REMOVE,
H_ENTER,
H_READ,
H_PROTECT,
H_BULK_REMOVE,
H_GET_TCE,
H_PUT_TCE,
H_SET_DABR,
H_SET_XDABR,
H_CEDE,
H_PROD,
H_CONFER,
H_REGISTER_VPA,
#ifdef CONFIG_KVM_XICS
H_EOI,
H_CPPR,
H_IPI,
H_IPOLL,
H_XIRR,
H_XIRR_X,
#endif
0
};
static void init_default_hcalls(void)
{
int i;
unsigned int hcall;
for (i = 0; default_hcall_list[i]; ++i) {
hcall = default_hcall_list[i];
WARN_ON(!kvmppc_hcall_impl_hv(hcall));
__set_bit(hcall / 4, default_enabled_hcalls);
}
}
static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
{
unsigned long lpcr;
int radix;
int err;
/* If not on a POWER9, reject it */
if (!cpu_has_feature(CPU_FTR_ARCH_300))
return -ENODEV;
/* If any unknown flags set, reject it */
if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
return -EINVAL;
/* GR (guest radix) bit in process_table field must match */
radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX);
if (!!(cfg->process_table & PATB_GR) != radix)
return -EINVAL;
/* Process table size field must be reasonable, i.e. <= 24 */
if ((cfg->process_table & PRTS_MASK) > 24)
return -EINVAL;
/* We can change a guest to/from radix now, if the host is radix */
if (radix && !radix_enabled())
return -EINVAL;
/* If we're a nested hypervisor, we currently only support radix */
if (kvmhv_on_pseries() && !radix)
return -EINVAL;
mutex_lock(&kvm->arch.mmu_setup_lock);
if (radix != kvm_is_radix(kvm)) {
if (kvm->arch.mmu_ready) {
kvm->arch.mmu_ready = 0;
/* order mmu_ready vs. vcpus_running */
smp_mb();
if (atomic_read(&kvm->arch.vcpus_running)) {
kvm->arch.mmu_ready = 1;
err = -EBUSY;
goto out_unlock;
}
}
if (radix)
err = kvmppc_switch_mmu_to_radix(kvm);
else
err = kvmppc_switch_mmu_to_hpt(kvm);
if (err)
goto out_unlock;
}
kvm->arch.process_table = cfg->process_table;
kvmppc_setup_partition_table(kvm);
lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
err = 0;
out_unlock:
mutex_unlock(&kvm->arch.mmu_setup_lock);
return err;
}
static int kvmhv_enable_nested(struct kvm *kvm)
{
if (!nested)
return -EPERM;
if (!cpu_has_feature(CPU_FTR_ARCH_300) || no_mixing_hpt_and_radix)
return -ENODEV;
/* kvm == NULL means the caller is testing if the capability exists */
if (kvm)
kvm->arch.nested_enable = true;
return 0;
}
static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
int size)
{
int rc = -EINVAL;
if (kvmhv_vcpu_is_radix(vcpu)) {
rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size);
if (rc > 0)
rc = -EINVAL;
}
/* For now quadrants are the only way to access nested guest memory */
if (rc && vcpu->arch.nested)
rc = -EAGAIN;
return rc;
}
static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr,
int size)
{
int rc = -EINVAL;
if (kvmhv_vcpu_is_radix(vcpu)) {
rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size);
if (rc > 0)
rc = -EINVAL;
}
/* For now quadrants are the only way to access nested guest memory */
if (rc && vcpu->arch.nested)
rc = -EAGAIN;
return rc;
}
static struct kvmppc_ops kvm_ops_hv = {
.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
.get_one_reg = kvmppc_get_one_reg_hv,
.set_one_reg = kvmppc_set_one_reg_hv,
.vcpu_load = kvmppc_core_vcpu_load_hv,
.vcpu_put = kvmppc_core_vcpu_put_hv,
.inject_interrupt = kvmppc_inject_interrupt_hv,
.set_msr = kvmppc_set_msr_hv,
.vcpu_run = kvmppc_vcpu_run_hv,
.vcpu_create = kvmppc_core_vcpu_create_hv,
.vcpu_free = kvmppc_core_vcpu_free_hv,
.check_requests = kvmppc_core_check_requests_hv,
.get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv,
.flush_memslot = kvmppc_core_flush_memslot_hv,
.prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
.commit_memory_region = kvmppc_core_commit_memory_region_hv,
.unmap_hva_range = kvm_unmap_hva_range_hv,
.age_hva = kvm_age_hva_hv,
.test_age_hva = kvm_test_age_hva_hv,
.set_spte_hva = kvm_set_spte_hva_hv,
.mmu_destroy = kvmppc_mmu_destroy_hv,
.free_memslot = kvmppc_core_free_memslot_hv,
.create_memslot = kvmppc_core_create_memslot_hv,
.init_vm = kvmppc_core_init_vm_hv,
.destroy_vm = kvmppc_core_destroy_vm_hv,
.get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
.emulate_op = kvmppc_core_emulate_op_hv,
.emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
.emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
.fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
.arch_vm_ioctl = kvm_arch_vm_ioctl_hv,
.hcall_implemented = kvmppc_hcall_impl_hv,
#ifdef CONFIG_KVM_XICS
.irq_bypass_add_producer = kvmppc_irq_bypass_add_producer_hv,
.irq_bypass_del_producer = kvmppc_irq_bypass_del_producer_hv,
#endif
.configure_mmu = kvmhv_configure_mmu,
.get_rmmu_info = kvmhv_get_rmmu_info,
.set_smt_mode = kvmhv_set_smt_mode,
.enable_nested = kvmhv_enable_nested,
.load_from_eaddr = kvmhv_load_from_eaddr,
.store_to_eaddr = kvmhv_store_to_eaddr,
};
static int kvm_init_subcore_bitmap(void)
{
int i, j;
int nr_cores = cpu_nr_cores();
struct sibling_subcore_state *sibling_subcore_state;
for (i = 0; i < nr_cores; i++) {
int first_cpu = i * threads_per_core;
int node = cpu_to_node(first_cpu);
/* Ignore if it is already allocated. */
if (paca_ptrs[first_cpu]->sibling_subcore_state)
continue;
sibling_subcore_state =
kzalloc_node(sizeof(struct sibling_subcore_state),
GFP_KERNEL, node);
if (!sibling_subcore_state)
return -ENOMEM;
for (j = 0; j < threads_per_core; j++) {
int cpu = first_cpu + j;
paca_ptrs[cpu]->sibling_subcore_state =
sibling_subcore_state;
}
}
return 0;
}
static int kvmppc_radix_possible(void)
{
return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled();
}
static int kvmppc_book3s_init_hv(void)
{
int r;
if (!tlbie_capable) {
pr_err("KVM-HV: Host does not support TLBIE\n");
return -ENODEV;
}
/*
* FIXME!! Do we need to check on all cpus ?
*/
r = kvmppc_core_check_processor_compat_hv();
if (r < 0)
return -ENODEV;
r = kvmhv_nested_init();
if (r)
return r;
r = kvm_init_subcore_bitmap();
if (r)
return r;
/*
* We need a way of accessing the XICS interrupt controller,
* either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or
* indirectly, via OPAL.
*/
#ifdef CONFIG_SMP
if (!xics_on_xive() && !kvmhv_on_pseries() &&
!local_paca->kvm_hstate.xics_phys) {
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc");
if (!np) {
pr_err("KVM-HV: Cannot determine method for accessing XICS\n");
return -ENODEV;
}
/* presence of intc confirmed - node can be dropped again */
of_node_put(np);
}
#endif
kvm_ops_hv.owner = THIS_MODULE;
kvmppc_hv_ops = &kvm_ops_hv;
init_default_hcalls();
init_vcore_lists();
r = kvmppc_mmu_hv_init();
if (r)
return r;
if (kvmppc_radix_possible())
r = kvmppc_radix_init();
/*
* POWER9 chips before version 2.02 can't have some threads in
* HPT mode and some in radix mode on the same core.
*/
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
unsigned int pvr = mfspr(SPRN_PVR);
if ((pvr >> 16) == PVR_POWER9 &&
(((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) ||
((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101)))
no_mixing_hpt_and_radix = true;
}
return r;
}
static void kvmppc_book3s_exit_hv(void)
{
kvmppc_free_host_rm_ops();
if (kvmppc_radix_possible())
kvmppc_radix_exit();
kvmppc_hv_ops = NULL;
kvmhv_nested_exit();
}
module_init(kvmppc_book3s_init_hv);
module_exit(kvmppc_book3s_exit_hv);
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");
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