• Uros Bizjak's avatar
    KVM: x86/mmu: Use try_cmpxchg64 in fast_pf_fix_direct_spte · 2db2f46f
    Uros Bizjak authored
    Use try_cmpxchg64 instead of cmpxchg64 (*ptr, old, new) != old in
    fast_pf_fix_direct_spte. cmpxchg returns success in ZF flag, so this
    change saves a compare after cmpxchg (and related move instruction
    in front of cmpxchg).
    Signed-off-by: default avatarUros Bizjak <ubizjak@gmail.com>
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Sean Christopherson <seanjc@google.com>
    Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
    Cc: Wanpeng Li <wanpengli@tencent.com>
    Cc: Jim Mattson <jmattson@google.com>
    Cc: Joerg Roedel <joro@8bytes.org>
    Message-Id: <20220520144635.63134-1-ubizjak@gmail.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
    2db2f46f
mmu.c 175 KB