Commit bf627a92 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
Browse files

x86/kvm/mmu: check if MMU reconfiguration is needed in init_kvm_nested_mmu() 



We don't use root page role for nested_mmu, however, optimizing out
re-initialization in case nothing changed is still valuable as this
is done for every nested vmentry.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 7dcd5755

arch/x86/kvm/mmu.c

+6 −0
Original line number Diff line number Diff line
@@ -4936,8 +4936,14 @@ static void init_kvm_softmmu(struct kvm_vcpu *vcpu) 


static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)

{

	union kvm_mmu_role new_role = kvm_calc_mmu_role_common(vcpu, false);

	struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;



	new_role.base.word &= mmu_base_role_mask.word;

	if (new_role.as_u64 == g_context->mmu_role.as_u64)

		return;



	g_context->mmu_role.as_u64 = new_role.as_u64;

	g_context->get_cr3           = get_cr3;

	g_context->get_pdptr         = kvm_pdptr_read;

	g_context->inject_page_fault = kvm_inject_page_fault;

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