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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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

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