forked from Minki/linux
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: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -4936,8 +4936,14 @@ static void init_kvm_softmmu(struct kvm_vcpu *vcpu)
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static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
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{
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union kvm_mmu_role new_role = kvm_calc_mmu_role_common(vcpu, false);
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struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;
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new_role.base.word &= mmu_base_role_mask.word;
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if (new_role.as_u64 == g_context->mmu_role.as_u64)
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return;
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g_context->mmu_role.as_u64 = new_role.as_u64;
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g_context->get_cr3 = get_cr3;
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g_context->get_pdptr = kvm_pdptr_read;
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g_context->inject_page_fault = kvm_inject_page_fault;
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