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PPC KVM update for 5.10

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- Fix for running nested guests with in-kernel IRQ chip
 - Fix race condition causing occasional host hard lockup
 - Minor cleanups and bugfixes
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Merge tag 'kvm-ppc-next-5.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD

PPC KVM update for 5.10

- Fix for running nested guests with in-kernel IRQ chip
- Fix race condition causing occasional host hard lockup
- Minor cleanups and bugfixes
This commit is contained in:
Paolo Bonzini 2020-09-22 08:18:16 -04:00
commit 2e3df760cd
13 changed files with 110 additions and 48 deletions
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1
arch/powerpc/include/asm/kvm_host.h
View File

@ -326,6 +326,7 @@ struct kvm_arch {
#endif
#ifdef CONFIG_KVM_XICS
struct kvmppc_xics *xics;
struct kvmppc_xics *xics_device;
struct kvmppc_xive *xive; /* Current XIVE device in use */
struct {
struct kvmppc_xive *native;

8
arch/powerpc/kvm/book3s.c
View File

@ -558,12 +558,12 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id,
@ -879,13 +879,15 @@ void kvmppc_core_destroy_vm(struct kvm *kvm)
#ifdef CONFIG_KVM_XICS
/*
* Free the XIVE devices which are not directly freed by the
* Free the XIVE and XICS devices which are not directly freed by the
* device 'release' method
*/
kfree(kvm->arch.xive_devices.native);
kvm->arch.xive_devices.native = NULL;
kfree(kvm->arch.xive_devices.xics_on_xive);
kvm->arch.xive_devices.xics_on_xive = NULL;
kfree(kvm->arch.xics_device);
kvm->arch.xics_device = NULL;
#endif /* CONFIG_KVM_XICS */
}

2
arch/powerpc/kvm/book3s_64_mmu_radix.c
View File

@ -347,7 +347,7 @@ static unsigned long kvmppc_radix_update_pte(struct kvm *kvm, pte_t *ptep,
return __radix_pte_update(ptep, clr, set);
}
void kvmppc_radix_set_pte_at(struct kvm *kvm, unsigned long addr,
static void kvmppc_radix_set_pte_at(struct kvm *kvm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
radix__set_pte_at(kvm->mm, addr, ptep, pte, 0);

4
arch/powerpc/kvm/book3s_64_vio.c
View File

@ -283,7 +283,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvmppc_spapr_tce_table *siter;
struct mm_struct *mm = kvm->mm;
unsigned long npages, size = args->size;
int ret = -ENOMEM;
int ret;
if (!args->size || args->page_shift < 12 || args->page_shift > 34 ||
(args->offset + args->size > (ULLONG_MAX >> args->page_shift)))
@ -489,7 +489,7 @@ static long kvmppc_tce_iommu_unmap(struct kvm *kvm,
return ret;
}
long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
static long kvmppc_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
unsigned long entry, unsigned long ua,
enum dma_data_direction dir)
{

2
arch/powerpc/kvm/book3s_64_vio_hv.c
View File

@ -237,7 +237,7 @@ static long iommu_tce_xchg_no_kill_rm(struct mm_struct *mm,
return ret;
}
extern void iommu_tce_kill_rm(struct iommu_table *tbl,
static void iommu_tce_kill_rm(struct iommu_table *tbl,
unsigned long entry, unsigned long pages)
{
if (tbl->it_ops->tce_kill)

22
arch/powerpc/kvm/book3s_hv.c
View File

@ -3442,9 +3442,19 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long host_psscr = mfspr(SPRN_PSSCR);
unsigned long host_pidr = mfspr(SPRN_PID);
/*
* P8 and P9 suppress the HDEC exception when LPCR[HDICE] = 0,
* so set HDICE before writing HDEC.
*/
mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr | LPCR_HDICE);
isync();
hdec = time_limit - mftb();
if (hdec < 0)
if (hdec < 0) {
mtspr(SPRN_LPCR, vcpu->kvm->arch.host_lpcr);
isync();
return BOOK3S_INTERRUPT_HV_DECREMENTER;
}
mtspr(SPRN_HDEC, hdec);
if (vc->tb_offset) {
@ -3558,7 +3568,7 @@ static int kvmhv_load_hv_regs_and_go(struct kvm_vcpu *vcpu, u64 time_limit,
* 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,
static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
unsigned long lpcr)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
@ -3572,7 +3582,7 @@ int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit,
dec = mfspr(SPRN_DEC);
tb = mftb();
if (dec < 512)
if (dec < 0)
return BOOK3S_INTERRUPT_HV_DECREMENTER;
local_paca->kvm_hstate.dec_expires = dec + tb;
if (local_paca->kvm_hstate.dec_expires < time_limit)
@ -5250,6 +5260,12 @@ static long kvm_arch_vm_ioctl_hv(struct file *filp,
case KVM_PPC_ALLOCATE_HTAB: {
u32 htab_order;
/* If we're a nested hypervisor, we currently only support radix */
if (kvmhv_on_pseries()) {
r = -EOPNOTSUPP;
break;
}
r = -EFAULT;
if (get_user(htab_order, (u32 __user *)argp))
break;

9
arch/powerpc/kvm/book3s_hv_interrupts.S
View File

@ -58,13 +58,16 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
/*
* Put whatever is in the decrementer into the
* hypervisor decrementer.
* Because of a hardware deviation in P8 and P9,
* we need to set LPCR[HDICE] before writing HDEC.
*/
BEGIN_FTR_SECTION
ld r5, HSTATE_KVM_VCORE(r13)
ld r6, VCORE_KVM(r5)
ld r9, KVM_HOST_LPCR(r6)
andis. r9, r9, LPCR_LD@h
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
ori r8, r9, LPCR_HDICE
mtspr SPRN_LPCR, r8
isync
andis. r0, r9, LPCR_LD@h
mfspr r8,SPRN_DEC
mftb r7
BEGIN_FTR_SECTION

2
arch/powerpc/kvm/book3s_hv_nested.c
View File

@ -569,7 +569,7 @@ static void kvmhv_update_ptbl_cache(struct kvm_nested_guest *gp)
kvmhv_set_nested_ptbl(gp);
}
struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid)
static struct kvm_nested_guest *kvmhv_alloc_nested(struct kvm *kvm, unsigned int lpid)
{
struct kvm_nested_guest *gp;
long shadow_lpid;

2
arch/powerpc/kvm/book3s_hv_rm_xics.c
View File

@ -764,7 +764,7 @@ int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
return ics_rm_eoi(vcpu, irq);
}
unsigned long eoi_rc;
static unsigned long eoi_rc;
static void icp_eoi(struct irq_chip *c, u32 hwirq, __be32 xirr, bool *again)
{

2
arch/powerpc/kvm/book3s_pr.c
View File

@ -569,7 +569,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
#endif
}
void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
static void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
{
u32 host_pvr;

86
arch/powerpc/kvm/book3s_xics.c
View File

@ -1334,47 +1334,97 @@ static int xics_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
return -ENXIO;
}
static void kvmppc_xics_free(struct kvm_device *dev)
/*
* Called when device fd is closed. kvm->lock is held.
*/
static void kvmppc_xics_release(struct kvm_device *dev)
{
struct kvmppc_xics *xics = dev->private;
int i;
struct kvm *kvm = xics->kvm;
struct kvm_vcpu *vcpu;
pr_devel("Releasing xics device\n");
/*
* Since this is the device release function, we know that
* userspace does not have any open fd referring to the
* device. Therefore there can not be any of the device
* attribute set/get functions being executed concurrently,
* and similarly, the connect_vcpu and set/clr_mapped
* functions also cannot be being executed.
*/
debugfs_remove(xics->dentry);
/*
* We should clean up the vCPU interrupt presenters first.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
/*
* Take vcpu->mutex to ensure that no one_reg get/set ioctl
* (i.e. kvmppc_xics_[gs]et_icp) can be done concurrently.
* Holding the vcpu->mutex also means that execution is
* excluded for the vcpu until the ICP was freed. When the vcpu
* can execute again, vcpu->arch.icp and vcpu->arch.irq_type
* have been cleared and the vcpu will not be going into the
* XICS code anymore.
*/
mutex_lock(&vcpu->mutex);
kvmppc_xics_free_icp(vcpu);
mutex_unlock(&vcpu->mutex);
}
if (kvm)
kvm->arch.xics = NULL;
for (i = 0; i <= xics->max_icsid; i++)
for (i = 0; i <= xics->max_icsid; i++) {
kfree(xics->ics[i]);
kfree(xics);
xics->ics[i] = NULL;
}
/*
* A reference of the kvmppc_xics pointer is now kept under
* the xics_device pointer of the machine for reuse. It is
* freed when the VM is destroyed for now until we fix all the
* execution paths.
*/
kfree(dev);
}
static struct kvmppc_xics *kvmppc_xics_get_device(struct kvm *kvm)
{
struct kvmppc_xics **kvm_xics_device = &kvm->arch.xics_device;
struct kvmppc_xics *xics = *kvm_xics_device;
if (!xics) {
xics = kzalloc(sizeof(*xics), GFP_KERNEL);
*kvm_xics_device = xics;
} else {
memset(xics, 0, sizeof(*xics));
}
return xics;
}
static int kvmppc_xics_create(struct kvm_device *dev, u32 type)
{
struct kvmppc_xics *xics;
struct kvm *kvm = dev->kvm;
int ret = 0;
xics = kzalloc(sizeof(*xics), GFP_KERNEL);
pr_devel("Creating xics for partition\n");
/* Already there ? */
if (kvm->arch.xics)
return -EEXIST;
xics = kvmppc_xics_get_device(kvm);
if (!xics)
return -ENOMEM;
dev->private = xics;
xics->dev = dev;
xics->kvm = kvm;
/* Already there ? */
if (kvm->arch.xics)
ret = -EEXIST;
else
kvm->arch.xics = xics;
if (ret) {
kfree(xics);
return ret;
}
kvm->arch.xics = xics;
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
if (cpu_has_feature(CPU_FTR_ARCH_206) &&
@ -1399,7 +1449,7 @@ struct kvm_device_ops kvm_xics_ops = {
.name = "kvm-xics",
.create = kvmppc_xics_create,
.init = kvmppc_xics_init,
.destroy = kvmppc_xics_free,
.release = kvmppc_xics_release,
.set_attr = xics_set_attr,
.get_attr = xics_get_attr,
.has_attr = xics_has_attr,
@ -1415,7 +1465,7 @@ int kvmppc_xics_connect_vcpu(struct kvm_device *dev, struct kvm_vcpu *vcpu,
return -EPERM;
if (xics->kvm != vcpu->kvm)
return -EPERM;
if (vcpu->arch.irq_type)
if (vcpu->arch.irq_type != KVMPPC_IRQ_DEFAULT)
return -EBUSY;
r = kvmppc_xics_create_icp(vcpu, xcpu);

12
arch/powerpc/kvm/book3s_xive_native.c
View File

@ -1227,17 +1227,7 @@ static int xive_native_debug_show(struct seq_file *m, void *private)
return 0;
}
static int xive_native_debug_open(struct inode *inode, struct file *file)
{
return single_open(file, xive_native_debug_show, inode->i_private);
}
static const struct file_operations xive_native_debug_fops = {
.open = xive_native_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
DEFINE_SHOW_ATTRIBUTE(xive_native_debug);
static void xive_native_debugfs_init(struct kvmppc_xive *xive)
{

6
arch/powerpc/kvm/booke.c
View File

@ -1747,12 +1747,12 @@ int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id,
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
@ -1773,7 +1773,7 @@ void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
return -ENOTSUPP;
return -EOPNOTSUPP;
}
void kvmppc_core_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)