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xen-devel
Re: [Xen-devel] Re: [PATCH] x86/pvclock-xen: zero last_value on resume
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To: |
"H. Peter Anvin" <hpa@xxxxxxxxx> |
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Subject: |
Re: [Xen-devel] Re: [PATCH] x86/pvclock-xen: zero last_value on resume |
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From: |
Ian Campbell <ijc@xxxxxxxxxxxxxx> |
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Date: |
Wed, 03 Nov 2010 12:46:34 +0000 |
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Cc: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>, kvm-devel <kvm@xxxxxxxxxxxxxxx>, Dolstra <e.dolstra@xxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Virtualization <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Hanesse <olivier.hanesse@xxxxxxxxx>, Eelco, Olivier, Linux, Glauber Costa <glommer@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx> |
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Wed, 03 Nov 2010 05:47:41 -0700 |
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On Wed, 2010-10-27 at 13:59 -0700, H. Peter Anvin wrote:
> I'll check it this evening when I'm at a working network again :(
Did this get applied? It seems to affect 2.6.32.x too
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=602273) so can we tag
it for stable as well?
Thanks,
Ian.
>
> "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:
>
> > On 10/26/2010 10:48 AM, Glauber Costa wrote:
> >> On Tue, 2010-10-26 at 09:59 -0700, Jeremy Fitzhardinge wrote:
> >>> If the guest domain has been suspend/resumed or migrated, then the
> >>> system clock backing the pvclock clocksource may revert to a smaller
> >>> value (ie, can be non-monotonic across the migration/save-restore).
> >>> Make sure we zero last_value in that case so that the domain
> >>> continues to see clock updates.
> >>>
> >>> [ I don't know if kvm needs an analogous fix or not. ]
> >> After migration, save/restore, etc, we issue an ioctl where we tell
> >> the host the last clock value. That (in theory) guarantees
> >monotonicity.
> >>
> >> I am not opposed to this patch in any way, however.
> >
> >Thanks.
> >
> >HPA, do you want to take this, or shall I send it on?
> >
> >Thanks,
> > J
>
--
Ian Campbell
BOFH excuse #191:
Just type 'mv * /dev/null'.
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