* probe_intel_cpuid_faulting() behavior
@ 2013-09-11 9:34 Jan Beulich
2013-09-12 17:12 ` Liu, Jinsong
0 siblings, 1 reply; 2+ messages in thread
From: Jan Beulich @ 2013-09-11 9:34 UTC (permalink / raw)
To: Jinsong Liu; +Cc: xen-devel, Keir Fraser
Jinsong,
somehow it escaped my attention so far that this probing, on a CPU
not supporting the respective MSR, necessarily produces a GPF log
message. Since such instances are generally a reason to worry,
would it be possible to at least avoid this for all CPU families/models
below a certain level (the system I'm seeing this on is family 0xf
model 6)? If so, could you provide precise cut-off values (I can of
course easily enough create a patch myself once I have the
numbers)?
Jan
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: probe_intel_cpuid_faulting() behavior
2013-09-11 9:34 probe_intel_cpuid_faulting() behavior Jan Beulich
@ 2013-09-12 17:12 ` Liu, Jinsong
0 siblings, 0 replies; 2+ messages in thread
From: Liu, Jinsong @ 2013-09-12 17:12 UTC (permalink / raw)
To: Jan Beulich; +Cc: xen-devel, Keir Fraser
Jan Beulich wrote:
> Jinsong,
>
> somehow it escaped my attention so far that this probing, on a CPU
> not supporting the respective MSR, necessarily produces a GPF log
> message. Since such instances are generally a reason to worry,
> would it be possible to at least avoid this for all CPU
> families/models below a certain level (the system I'm seeing this on
> is family 0xf model 6)? If so, could you provide precise cut-off
> values (I can of course easily enough create a patch myself once I
> have the
> numbers)?
>
> Jan
Sorry, no. It's non-architectural but no official/precise family/model/stepping provided, so enumeration has to tolerate GPF log on legacy processors. What is more, no guarantee for future processors also support it.
Thanks,
Jinsong
^ permalink raw reply [flat|nested] 2+ messages in thread
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