linux-kernel - [PATCH 10/43] KVM: nVMX: Lift sync_vmcs12() out of prepare

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Date:   Thu, 13 Jun 2019 19:02:56 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        vkuznets@...hat.com
Subject: [PATCH 10/43] KVM: nVMX: Lift sync_vmcs12() out of prepare_vmcs12()

From: Sean Christopherson <sean.j.christopherson@...el.com>

... 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@...el.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx/nested.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 376fd9eabe42..bdaf49d9260f 100644
--- 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);
 
-- 
1.8.3.1