linux-kernel - [PATCH 1/4] KVM: nVMX: move vmentry tasks from prepare_vmcs12 to enter_vmx_non_root

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Date:   Wed, 23 Aug 2017 22:43:55 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     wanpeng.li@...mail.com, david@...hat.com, rkrcmar@...hat.com,
        jmattson@...gle.com
Subject: [PATCH 1/4] KVM: nVMX: move vmentry tasks from prepare_vmcs12 to enter_vmx_non_root_mode

Setting the VMCS12 to launched and clearing the vm_entry_intr_info_field
was done as part of L0->L1 exit in prepare_vmcs12.  In order to simplify
prepare_vmcs12, move this to enter_vmx_non_root_mode since at this point
we've already committed to vmentry.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 19aa69af7c2d..01c29b6af254 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -10752,6 +10752,13 @@ static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu, bool from_vmentry)
 	 * returned as far as L1 is concerned. It will only return (and set
 	 * the success flag) when L2 exits (see nested_vmx_vmexit()).
 	 */
+	if (from_vmentry) {
+		vmcs12->launch_state = 1;
+
+		/* vm_entry_intr_info_field is cleared on exit. Emulate this
+		 * instead of reading the real value. */
+		vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK;
+	}
 	return 0;
 }
 
@@ -11121,12 +11128,6 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
 	vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
 
 	if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) {
-		vmcs12->launch_state = 1;
-
-		/* vm_entry_intr_info_field is cleared on exit. Emulate this
-		 * instead of reading the real value. */
-		vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK;
-
 		/*
 		 * Transfer the event that L0 or L1 may wanted to inject into
 		 * L2 to IDT_VECTORING_INFO_FIELD.
-- 
1.8.3.1