diff options
| author | Uros Bizjak <[email protected]> | 2022-05-20 16:37:37 +0200 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2022-06-15 08:11:24 -0400 |
| commit | 0ac304de73b37b66793d6cc1ad3a03886aa79791 (patch) | |
| tree | 522990c19985ab7a8eae835511bddc521e7e2d09 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | aee98a6838d52d5cca14610d228893e9208f4ed1 (diff) | |
KVM: VMX: Use try_cmpxchg64 in pi_try_set_control
Use try_cmpxchg64 instead of cmpxchg64 (*ptr, old, new) != old
in pi_try_set_control. cmpxchg returns success in ZF flag, so this
change saves a compare after cmpxchg (and related move instruction
in front of cmpxchg):
b9: 88 44 24 60 mov %al,0x60(%rsp)
bd: 48 89 c8 mov %rcx,%rax
c0: c6 44 24 62 f2 movb $0xf2,0x62(%rsp)
c5: 48 8b 74 24 60 mov 0x60(%rsp),%rsi
ca: f0 49 0f b1 34 24 lock cmpxchg %rsi,(%r12)
d0: 48 39 c1 cmp %rax,%rcx
d3: 75 cf jne a4 <vmx_vcpu_pi_load+0xa4>
patched:
c1: 88 54 24 60 mov %dl,0x60(%rsp)
c5: c6 44 24 62 f2 movb $0xf2,0x62(%rsp)
ca: 48 8b 54 24 60 mov 0x60(%rsp),%rdx
cf: f0 48 0f b1 13 lock cmpxchg %rdx,(%rbx)
d4: 75 d5 jne ab <vmx_vcpu_pi_load+0xab>
Signed-off-by: Uros Bizjak <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Sean Christopherson <[email protected]>
Cc: Vitaly Kuznetsov <[email protected]>
Cc: Wanpeng Li <[email protected]>
Cc: Jim Mattson <[email protected]>
Cc: Joerg Roedel <[email protected]>
Reported-by: kernel test robot <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions