KVM: nVMX: Lift sync_vmcs12() out of prepare_vmcs12()

... to make it more obvious that sync_vmcs12() is invoked on all nested
VM-Exits, e.g. hiding sync_vmcs12() in prepare_vmcs12() makes it appear
that guest state is NOT propagated to vmcs12 for a normal VM-Exit.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 376fd9e..bdaf49d 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3500,11 +3500,7 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
                           u32 exit_reason, u32 exit_intr_info,
                           unsigned long exit_qualification)
 {
-       /* update guest state fields: */
-       sync_vmcs12(vcpu, vmcs12);
-
        /* update exit information fields: */
-
        vmcs12->vm_exit_reason = exit_reason;
        vmcs12->exit_qualification = exit_qualification;
        vmcs12->vm_exit_intr_info = exit_intr_info;
@@ -3865,9 +3861,9 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
                vcpu->arch.tsc_offset -= vmcs12->tsc_offset;
 
        if (likely(!vmx->fail)) {
-               if (exit_reason == -1)
-                       sync_vmcs12(vcpu, vmcs12);
-               else
+               sync_vmcs12(vcpu, vmcs12);
+
+               if (exit_reason != -1)
                        prepare_vmcs12(vcpu, vmcs12, exit_reason, exit_intr_info,
                                       exit_qualification);