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| author | Gabriel L. Somlo <gsomlo@gmail.com> | 2014-05-07 16:52:13 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-05-08 15:40:49 +0200 |
| commit | 87c00572ba05aa8c9db118da75c608f47eb10b9e (patch) | |
| tree | 484e8cc1da97c7302c739364ee0af9bd68cebb0e /tools/perf/scripts/python/check-perf-trace.py | |
| parent | b63cf42fd1d8c18fab71222321aaf356f63089c9 (diff) | |
kvm: x86: emulate monitor and mwait instructions as nop
Treat monitor and mwait instructions as nop, which is architecturally
correct (but inefficient) behavior. We do this to prevent misbehaving
guests (e.g. OS X <= 10.7) from crashing after they fail to check for
monitor/mwait availability via cpuid.
Since mwait-based idle loops relying on these nop-emulated instructions
would keep the host CPU pegged at 100%, do NOT advertise their presence
via cpuid, to prevent compliant guests from using them inadvertently.
Signed-off-by: Gabriel L. Somlo <somlo@cmu.edu>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/check-perf-trace.py')
0 files changed, 0 insertions, 0 deletions