lkml.org 
[lkml]   [2022]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH 5.10 001/130] KVM/VMX: Use TEST %REG,%REG instead of CMP $0,%REG in vmenter.S
    Date
    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: Ben Hutchings <ben@decadent.org.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/kvm/vmx/vmenter.S | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- 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

    \
     
     \ /
      Last update: 2022-07-12 20:40    [W:3.988 / U:0.548 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site