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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

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>

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