@@ -4907,8 +4907,14 @@ 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, true);
struct kvm_mmu *g_context = &vcpu->arch.nested_mmu;
+ new_role.base_role.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;
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> --- arch/x86/kvm/mmu.c | 6 ++++++ 1 file changed, 6 insertions(+)