Re: [Xen-devel] [PATCH v5] x86/Intel: virtualize support for cpuid faulting

[Kyle Huey <me@xxxxxxxxxxxx>]

On Thu, Oct 20, 2016 at 9:19 AM, Andrew Cooper
<andrew.cooper3@xxxxxxxxxx> wrote:
> On 20/10/16 15:15, Wei Liu wrote:
>> On Thu, Oct 20, 2016 at 06:44:26AM -0700, Kyle Huey wrote:
>>> rr (http://rr-project.org/), a Linux userspace record-and-replay reverse-
>>> execution debugger, would like to trap and emulate the CPUID instruction.
>>> This would allow us to a) mask away certain hardware features that rr does
>>> not support (e.g. RDRAND) and b) enable trace portability across machines
>>> by providing constant results. Patches for support in the Linux kernel are 
>>> in
>>> flight, and we'd like to be able to use this feature on virtualized Linux
>>> instances as well.
>>>
>>> Changes since v4:
>>> - Renamed cpuid_fault to cpuid_faulting across the patch.
>>> - Various style nits.
>>> - Added Reviewed-by Kevin Tian.
>>>
>> Release-acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
>
> Committed, along with its regression test.
>
> Thanks.
>
> ~Andrew

Great!  Thanks for all your help.

- Kyle

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