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

[Kyle Huey <me@xxxxxxxxxxxx>]

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.


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