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Re: [Xen-devel] [PATCH v9] new config option vtsc_tolerance_khz to avoid TSC emulation

On Thu, Jun 07, Jan Beulich wrote:

> >>> On 07.06.18 at 16:49, <olaf@xxxxxxxxx> wrote:
> > Am Thu, 07 Jun 2018 08:44:41 -0600
> > schrieb "Jan Beulich" <JBeulich@xxxxxxxx>:
> >> The re-use of the field is acceptable only if all existing senders reliably
> >> fill zero in there.
> > How do we know all senders? I just know about write_tsc_info from xen-4.6+.
> I don't think we care about senders other than ones using libxc, so
> by knowing whether all libxc versions conform to the requirement,
> we could declare we're fine.

Yes, I think we are fine. And if migration from pre-4.6 is supported
anyway is another question. Most likely the answer is no.


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