KVM: nSVM: use nested_svm_load_cr3() on guest->host switch

Make nSVM code resemble nVMX where nested_vmx_load_cr3() is used on
both guest->host and host->guest transitions. Also, we can now
eliminate unconditional kvm_mmu_reset_context() and speed things up.

Note, nVMX has two different paths: load_vmcs12_host_state() and
nested_vmx_restore_host_state() and the later is used to restore from
'partial' switch to L2, it always uses kvm_mmu_reset_context().
nSVM doesn't have this yet. Also, nested_svm_vmexit()'s return value
is almost always ignored nowadays.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200710141157.1640173-9-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index f7d5baf..7b331e3 100644 (file)
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -342,8 +342,8 @@ static inline bool nested_npt_enabled(struct vcpu_svm *svm)
 }
 
 /*
- * Load guest's cr3 at nested entry. @nested_npt is true if we are
- * emulating VM-Entry into a guest with NPT enabled.
+ * Load guest's/host's cr3 on nested vmentry or vmexit. @nested_npt is true
+ * if we are emulating VM-Entry into a guest with NPT enabled.
  */
 static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
                               bool nested_npt)
@@ -676,15 +676,12 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
 
        nested_svm_uninit_mmu_context(&svm->vcpu);
 
-       if (npt_enabled) {
-               svm->vmcb->save.cr3 = hsave->save.cr3;
-               svm->vcpu.arch.cr3 = hsave->save.cr3;
-       } else {
-               (void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
-       }
+       rc = nested_svm_load_cr3(&svm->vcpu, hsave->save.cr3, false);
+       if (rc)
+               return 1;
 
-       kvm_mmu_reset_context(&svm->vcpu);
-       kvm_mmu_load(&svm->vcpu);
+       if (npt_enabled)
+               svm->vmcb->save.cr3 = hsave->save.cr3;
 
        /*
         * Drop what we picked up for L2 via svm_complete_interrupts() so it