From: Uros Bizjak <ubizjak@gmail.com>
Date: Thu, 29 Oct 2020 14:04:57 +0000 (+0100)
Subject: KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6c44221b05236cc65d76cb5dc2463f738edff39d;p=linux.git

KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S

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>
---

diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index 90ad7a6246e36..e85aa5faa22d3 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -132,7 +132,7 @@ SYM_FUNC_START(__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_RCX(%_ASM_AX), %_ASM_CX