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KVM: VMX: Update vmcs.GUEST_CR3 only when the guest CR3 is dirty

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When vcpu->arch.cr3 is changed, it is marked dirty, so vmcs.GUEST_CR3
can be updated only when kvm_register_is_dirty(vcpu, VCPU_EXREG_CR3).

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Message-Id: <20211108124407.12187-12-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lai Jiangshan 2021-11-08 20:44:03 +08:00 committed by Paolo Bonzini
parent 3883bc9d28
commit c62c7bd4f9
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/vmx/vmx.c
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@ -3114,9 +3114,9 @@ static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
if (!enable_unrestricted_guest && !is_paging(vcpu))
guest_cr3 = to_kvm_vmx(kvm)->ept_identity_map_addr;
else if (test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
else if (kvm_register_is_dirty(vcpu, VCPU_EXREG_CR3))
guest_cr3 = vcpu->arch.cr3;
else /* vmcs01.GUEST_CR3 is already up-to-date. */
else /* vmcs.GUEST_CR3 is already up-to-date. */
update_guest_cr3 = false;
vmx_ept_load_pdptrs(vcpu);
} else {