Re: [PATCH v16 09/10] x86/arch_prctl: Selftest for ARCH_[GET|SET]_CPUID

[Wanpeng Li]

2017-10-11 11:56 GMT+08:00 Kyle Huey <me@xxxxxxxxxxxx>:
> On Tue, Oct 10, 2017 at 8:35 PM, Wanpeng Li <kernellwp@xxxxxxxxx> wrote:
>> Hi Kyle,
>> 2017-03-20 16:16 GMT+08:00 Kyle Huey <me@xxxxxxxxxxxx>:
>>> Test disabling and reenabling the cpuid instruction via the new arch_prctl
>>> ARCH_SET_CPUID, retrieving the current state via ARCH_GET_CPUID, and the
>>> expected behaviors across fork() and exec().
>>>
>>> Signed-off-by: Kyle Huey <khuey@xxxxxxxxxxxx>
>>> ---
>>>  tools/testing/selftests/x86/Makefile      |   2 +-
>>>  tools/testing/selftests/x86/cpuid_fault.c | 251 ++++++++++++++++++++++++++++++
>>
>> I'm not sure why this commit is not merged to upstream. I test
>> 4.14-rc3 w/ this testcase on a haswell client, however I encounter the
>> below splat, any idea?
>
> Thanks for pointing out that this never got merged.  That's quite
> disappointing, especially after reviewers insisted I write this test.
>
> The failure you're seeing is because the values of ARCH_GET_CPUID and
> ARCH_SET_CPUID changed and the values hardcoded in the test are no
> longer accurate.  If you set them to the correct values (0x1011 and
> 0x1012 respectively) the test should pass.

It works, thanks Kyle.

Regards,
Wanpeng Li