Commit 55261738 authored by Lai Jiangshan's avatar Lai Jiangshan Committed by Paolo Bonzini
Browse files

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



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: default avatarLai Jiangshan <laijs@linux.alibaba.com>
Reviewed-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20210919024246.89230-2-jiangshanlai@gmail.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 413eaa4e

arch/x86/kvm/x86.c

+3 −2
Original line number Diff line number Diff line
@@ -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);