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Commit 6e42782f authored by Junaid Shahid's avatar Junaid Shahid Committed by Paolo Bonzini
Browse files

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: default avatarJunaid Shahid <junaids@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 9fa72119

arch/x86/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

arch/x86/kvm/mmu.c

+1 −2
Original line number Diff line number Diff line
@@ -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;

}

arch/x86/kvm/mmu.h

+7 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/kvm/x86.c

+2 −0
Original line number Diff line number Diff line
@@ -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)) {