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KVM: X86: Don't reset mmu context when X86_CR4_PCIDE 1->0

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X86_CR4_PCIDE doesn't participate in kvm_mmu_role, so the mmu context
doesn't need to be reset.  It is only required to flush all the guest
tlb.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210919024246.89230-2-jiangshanlai@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lai Jiangshan
2021-09-19 10:42:45 +08:00
committed by Paolo Bonzini
parent 413eaa4ecd
commit 552617382c
1 changed files with 3 additions and 2 deletions
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arch/x86/kvm/x86.c
+3 -2
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@@ -1022,9 +1022,10 @@ EXPORT_SYMBOL_GPL(kvm_is_valid_cr4);
void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4)
{
if (((cr4 ^ old_cr4) & KVM_MMU_CR4_ROLE_BITS) ||
(!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
if ((cr4 ^ old_cr4) & KVM_MMU_CR4_ROLE_BITS)
kvm_mmu_reset_context(vcpu);
else if (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE))
kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
}
EXPORT_SYMBOL_GPL(kvm_post_set_cr4);