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KVM: SVM: hyper-v: Remote TLB flush for SVM

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Enable remote TLB flush for SVM.

Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
Message-Id: <1ee364e397e142aed662d2920d198cd03772f1a5.1622730232.git.viremana@linux.microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vineeth Pillai 2021-06-03 15:14:38 +00:00 committed by Paolo Bonzini
parent 59d21d67f3
commit 1e0c7d4075
2 changed files with 75 additions and 0 deletions
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9
arch/x86/kvm/svm/svm.c
View File

@ -43,6 +43,9 @@
#include "svm.h"
#include "svm_ops.h"
#include "kvm_onhyperv.h"
#include "svm_onhyperv.h"
#define __ex(x) __kvm_handle_fault_on_reboot(x)
MODULE_AUTHOR("Qumranet");
@ -1003,6 +1006,8 @@ static __init int svm_hardware_setup(void)
/* Note, SEV setup consumes npt_enabled. */
sev_hardware_setup();
svm_hv_hardware_setup();
svm_adjust_mmio_mask();
for_each_possible_cpu(cpu) {
@ -1296,6 +1301,8 @@ static void init_vmcb(struct kvm_vcpu *vcpu)
}
}
svm_hv_init_vmcb(svm->vmcb);
vmcb_mark_all_dirty(svm->vmcb);
enable_gif(svm);
@ -3892,6 +3899,8 @@ static void svm_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
svm->vmcb->control.nested_cr3 = __sme_set(root_hpa);
vmcb_mark_dirty(svm->vmcb, VMCB_NPT);
hv_track_root_tdp(vcpu, root_hpa);
/* Loading L2's CR3 is handled by enter_svm_guest_mode. */
if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
return;

66
arch/x86/kvm/svm/svm_onhyperv.h Normal file
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@ -0,0 +1,66 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* KVM L1 hypervisor optimizations on Hyper-V for SVM.
*/
#ifndef __ARCH_X86_KVM_SVM_ONHYPERV_H__
#define __ARCH_X86_KVM_SVM_ONHYPERV_H__
#if IS_ENABLED(CONFIG_HYPERV)
#include <asm/mshyperv.h>
#include "hyperv.h"
#include "kvm_onhyperv.h"
static struct kvm_x86_ops svm_x86_ops;
/*
* Hyper-V uses the software reserved 32 bytes in VMCB
* control area to expose SVM enlightenments to guests.
*/
struct hv_enlightenments {
struct __packed hv_enlightenments_control {
u32 nested_flush_hypercall:1;
u32 msr_bitmap:1;
u32 enlightened_npt_tlb: 1;
u32 reserved:29;
} __packed hv_enlightenments_control;
u32 hv_vp_id;
u64 hv_vm_id;
u64 partition_assist_page;
u64 reserved;
} __packed;
static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
struct hv_enlightenments *hve =
(struct hv_enlightenments *)vmcb->control.reserved_sw;
if (npt_enabled &&
ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB)
hve->hv_enlightenments_control.enlightened_npt_tlb = 1;
}
static inline void svm_hv_hardware_setup(void)
{
if (npt_enabled &&
ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
pr_info("kvm: Hyper-V enlightened NPT TLB flush enabled\n");
svm_x86_ops.tlb_remote_flush = hv_remote_flush_tlb;
svm_x86_ops.tlb_remote_flush_with_range =
hv_remote_flush_tlb_with_range;
}
}
#else
static inline void svm_hv_init_vmcb(struct vmcb *vmcb)
{
}
static inline void svm_hv_hardware_setup(void)
{
}
#endif /* CONFIG_HYPERV */
#endif /* __ARCH_X86_KVM_SVM_ONHYPERV_H__ */