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| author | Luwei Kang <luwei.kang@intel.com> | 2018-03-14 03:26:31 +0800 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2018-03-19 17:05:57 -0300 |
| commit | c078ca968c6c7cb62781c1843d840cb0f5c72781 (patch) | |
| tree | 97d7ba1f9eb86a71a74b9672e686e342f7100277 /vl.c | |
| parent | 99193d8f2ef594648ad67cc3d007b0e4fb2f8cf8 (diff) | |
| download | qemu-c078ca968c6c7cb62781c1843d840cb0f5c72781.zip qemu-c078ca968c6c7cb62781c1843d840cb0f5c72781.tar.gz qemu-c078ca968c6c7cb62781c1843d840cb0f5c72781.tar.bz2 | |
i386: Disable Intel PT if packets IP payloads have LIP values
Intel processor trace should be disabled when
CPUID.(EAX=14H,ECX=0H).ECX.[bit31] is set.
Generated packets which contain IP payloads will have LIP
values when this bit is set, or IP payloads will have RIP
values.
Currently, The information of CPUID 14H is constant to make
live migration safty and this bit is always 0 in guest even
if host support LIP values.
Guest sees the bit is 0 will expect IP payloads with RIP
values, but the host CPU will generate IP payloads with
LIP values if this bit is set in HW.
To make sure the value of IP payloads correctly, Intel PT
should be disabled when bit[31] is set.
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Message-Id: <1520969191-18162-1-git-send-email-luwei.kang@intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'vl.c')
0 files changed, 0 insertions, 0 deletions