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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>
This commit is contained in:
Junaid Shahid 2018-06-27 14:59:08 -07:00 committed by Paolo Bonzini
parent 9fa72119b2
commit 6e42782f51
4 changed files with 11 additions and 2 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -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)

3
arch/x86/kvm/mmu.c
View File

@ -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;
}

7
arch/x86/kvm/mmu.h
View File

@ -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

2
arch/x86/kvm/x86.c
View File

@ -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)) {