From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olaf Hering <olaf@aepfle.de>
Subject: Re: [PATCH v9] new config option vtsc_tolerance_khz to
 avoid TSC emulation
Date: Thu, 7 Jun 2018 23:05:37 +0200
Message-ID: <20180607210537.GA18894@aepfle.de>
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To: Jan Beulich <JBeulich@suse.com>
Cc: Tim Deegan <tim@xen.org>, Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wei.liu2@citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Marek Marczykowski <marmarek@invisiblethingslab.com>, xen-devel@lists.xen.org, Julien Grall <julien.grall@arm.com>
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On Thu, Jun 07, Jan Beulich wrote:

> >>> On 07.06.18 at 16:49, <olaf@aepfle.de> wrote:
> > Am Thu, 07 Jun 2018 08:44:41 -0600
> > schrieb "Jan Beulich" <JBeulich@suse.com>:
> >> 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.

Olaf

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