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 06:30 PM, Andrew Cooper wrote:
> On 26/02/2018 19:44, Boris Ostrovsky wrote:
> > 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.
> Ah ok - thanks.  I'll wait to hear back from you then.

Took longer than I hoped, sorry.

Couldn't find anyone who is still using this mode (or perhaps noone 
wanted to admit to this ;-)).
-boris


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