Re: [Xen-devel] [RFC PATCH 0/5] x86: Multiple fixes to MSR_TSC_AUX and RDTSCP handling for guests

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 20/02/18 11:58, Andrew Cooper wrote:
> This rats nest was discovered when finding that MSR_TSC_AUX leaked into PV
> guests.  It is RFC because I haven't done extensive testing on the result, and
> because there are some functional changes for the virtualised TSC modes.
>
> Andrew Cooper (5):
>   x86/hvm: Don't shadow the domain parameter in hvm_save_cpu_msrs()
>   x86/pv: Avoid leaking other guests' MSR_TSC_AUX values into PV context
>   x86/time: Rework pv_soft_rdtsc() to aid further cleanup
>   x86/pv: Remove deferred RDTSC{,P} handling in pv_emulate_privileged_op()
>   x86: Rework MSR_TSC_AUX handling from scratch.

Konrad/Boris: Can we have any input WRT TSC_MODE_PVRDTSCP usage?  Are
you still using the feature, or is it abandoned?

~Andrew

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