diff options
| author | Junaid Shahid <junaids@google.com> | 2018-06-27 14:59:08 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-08-06 17:58:52 +0200 |
| commit | 6e42782f516f05c8030f63308f2457681b1c9919 (patch) | |
| tree | fd7a55232cc338dfd86687875a26e7a3a8c4ffc6 | |
| parent | 9fa72119b24db78d665a4034b5a0d349b0289b08 (diff) | |
| download | linux-6e42782f516f05c8030f63308f2457681b1c9919.tar.bz2 | |
kvm: x86: Introduce KVM_REQ_LOAD_CR3
The KVM_REQ_LOAD_CR3 request loads the hardware CR3 using the
current root_hpa.
Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/mmu.c | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/mmu.h | 7 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 2 |
4 files changed, 11 insertions, 2 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 290b7d05790a..c2b4df8a03cd 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -54,6 +54,7 @@ #define KVM_REQ_TRIPLE_FAULT KVM_ARCH_REQ(2) #define KVM_REQ_MMU_SYNC KVM_ARCH_REQ(3) #define KVM_REQ_CLOCK_UPDATE KVM_ARCH_REQ(4) +#define KVM_REQ_LOAD_CR3 KVM_ARCH_REQ(5) #define KVM_REQ_EVENT KVM_ARCH_REQ(6) #define KVM_REQ_APF_HALT KVM_ARCH_REQ(7) #define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(8) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index afb865d054c2..704f7df11f0b 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4847,8 +4847,7 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu) kvm_mmu_sync_roots(vcpu); if (r) goto out; - /* set_cr3() should ensure TLB has been flushed */ - vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); + kvm_mmu_load_cr3(vcpu); out: return r; } diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 5b408c0ad612..16b7178853ac 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -85,6 +85,13 @@ static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu) return kvm_mmu_load(vcpu); } +static inline void kvm_mmu_load_cr3(struct kvm_vcpu *vcpu) +{ + /* set_cr3() should ensure TLB has been flushed */ + if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) + vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); +} + /* * Currently, we have two sorts of write-protection, a) the first one * write-protects guest page to sync the guest modification, b) another one is diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 5a1e4f79398f..7748037b17fd 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7332,6 +7332,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) } if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu)) kvm_mmu_sync_roots(vcpu); + if (kvm_check_request(KVM_REQ_LOAD_CR3, vcpu)) + kvm_mmu_load_cr3(vcpu); if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) kvm_vcpu_flush_tlb(vcpu, true); if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) { |