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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 02/26/2018 02:12 PM, Andrew Cooper wrote:
> 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?


I already asked a few internal teams about, haven't heard back.

-boris

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