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

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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: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uros Bizjak
2020-10-29 15:04:57 +01:00
committed by Greg Kroah-Hartman
parent 7748091a31
commit 0ca2ba6e4d
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/vmx/vmenter.S
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@@ -132,7 +132,7 @@ SYM_FUNC_START(__vmx_vcpu_run)
mov (%_ASM_SP), %_ASM_AX mov (%_ASM_SP), %_ASM_AX
/* Check if vmlaunch or vmresume is needed */ /* Check if vmlaunch or vmresume is needed */
cmpb $0, %bl testb %bl, %bl
/* Load guest registers. Don't clobber flags. */ /* Load guest registers. Don't clobber flags. */
mov VCPU_RCX(%_ASM_AX), %_ASM_CX mov VCPU_RCX(%_ASM_AX), %_ASM_CX