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KVM: nVMX: Avoid one redundant vmcs_read in prepare_vmcs12

PATCH Applied Jan Kiszka 2 participants 2 messages Feb 20, 2013 – Feb 28, 2013

Subsystems (3)
x86 KVM KVM x86
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Jan Kiszka

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#0 lore raw

PATCH 1/1 KVM: nVMX: Avoid one redundant vmcs_read in prepare_vmcs12

IDT_VECTORING_INFO_FIELD was already read right after vmexit.

Signed-off-by Jan Kiszka <[email protected]>
---
 arch/x86/kvm/vmx.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
arch/x86/kvm/vmx.c +1 -2
index 7d2fbd2..d99a519 100644
@@ -7368,8 +7368,7 @@ void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
 
 	vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
 	vmcs12->vm_exit_intr_error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
-	vmcs12->idt_vectoring_info_field =
-		vmcs_read32(IDT_VECTORING_INFO_FIELD);
+	vmcs12->idt_vectoring_info_field = to_vmx(vcpu)->idt_vectoring_info;
 	vmcs12->idt_vectoring_error_code =
 		vmcs_read32(IDT_VECTORING_ERROR_CODE);
 	vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
Signature · 1 line
1.7.3.4
Applied
#1 lore raw
Quoted 2 lines · Jan Kiszka

IDT_VECTORING_INFO_FIELD was already read right after vmexit.

Applied, thanks.

Quoted 21 lines
Signed-off-by Jan Kiszka <[email protected]>
---
 arch/x86/kvm/vmx.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
arch/x86/kvm/vmx.c +1 -2
index 7d2fbd2..d99a519 100644
@@ -7368,8 +7368,7 @@ void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
 
 	vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
 	vmcs12->vm_exit_intr_error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
-	vmcs12->idt_vectoring_info_field =
-		vmcs_read32(IDT_VECTORING_INFO_FIELD);
+	vmcs12->idt_vectoring_info_field = to_vmx(vcpu)->idt_vectoring_info;
 	vmcs12->idt_vectoring_error_code =
 		vmcs_read32(IDT_VECTORING_ERROR_CODE);
 	vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
Signature · 1 line
1.7.3.4

--
Gleb.