diff mbox series

[5.4,24/37] KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S

Message ID 20221003131038.12645-25-cascardo@canonical.com (mailing list archive)
State New, archived
Headers show
Series IBRS support // Retbleed mitigations | expand

Commit Message

Thadeu Lima de Souza Cascardo Oct. 3, 2022, 1:10 p.m. UTC 
From: Uros Bizjak <ubizjak@gmail.com>

commit 6c44221b05236cc65d76cb5dc2463f738edff39d upstream.

Saves one byte in __vmx_vcpu_run for the same functionality.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Message-Id: <20201029140457.126965-1-ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
---
 arch/x86/kvm/vmx/vmenter.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index ca4252f81bf8..63cd7fbab0ac 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -135,7 +135,7 @@  ENTRY(__vmx_vcpu_run)
 	mov (%_ASM_SP), %_ASM_AX
 
 	/* Check if vmlaunch or vmresume is needed */
-	cmpb $0, %bl
+	testb %bl, %bl
 
 	/* Load guest registers.  Don't clobber flags. */
 	mov VCPU_RBX(%_ASM_AX), %_ASM_BX