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[Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate |
Date: |
Tue, 14 Dec 2010 06:43:43 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Dec 13, 2010 at 12:15:08PM -0700, Alex Williamson wrote:
> On Mon, 2010-12-13 at 21:06 +0200, Michael S. Tsirkin wrote:
> > On Mon, Dec 13, 2010 at 11:59:16AM -0700, Alex Williamson wrote:
> > > On Mon, 2010-12-13 at 20:54 +0200, Michael S. Tsirkin wrote:
> > > > On Mon, Dec 13, 2010 at 11:00:44AM -0700, Alex Williamson wrote:
> > > > > On Mon, 2010-12-13 at 19:50 +0200, Michael S. Tsirkin wrote:
> > > > > > On Mon, Dec 13, 2010 at 10:43:22AM -0700, Alex Williamson wrote:
> > > > > > > So, unfortunately, I stand by my original patch.
> > > > > >
> > > > > > What about the one that put -1 in saved index for a hotplugged
> > > > > > device?
> > > > >
> > > > > There are still examples that don't work even without hotplug
> > > > > (example 2
> > > > > and example 3 after the reboot). That hack limits the damage, but
> > > > > still
> > > > > leaves a latent bug for reboot and doesn't address the non-hotplug
> > > > > scenarios. So, I don't think it's worthwhile to pursue, and we
> > > > > shouldn't pretend we can use it to avoid bumping the version_id.
> > > > > Thanks,
> > > > >
> > > > > Alex
> > > >
> > > > I guess when we bump it we tell users: migration is completely
> > > > borken to the old version, don't even try it.
> > > >
> > > > Is there a way for libvirt to discover such incompatibilities
> > > > and avoid the migration?
> > >
> > > I don't know if libvirt has a way to query this in advance. If a
> > > migration is attempted, the target will report:
> > >
> > > savevm: unsupported version 5 for '0000:00:03.0/rtl8139' v4
> > >
> > > And the source will continue running. We waste plenty of bits getting
> > > to that point,
> >
> > Yes, this happens after all of memory has been migrated.
>
> Better late than never :^\
One other question: can we do the same by creating a new (empty)
section? As was discussed in the past this is easier for
downstreams to cherry-pick.
--
MST
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, (continued)
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/12
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/12
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Juan Quintela, 2010/12/12
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/13
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate,
Michael S. Tsirkin <=
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/14
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/14
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/14
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Paolo Bonzini, 2010/12/14
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/15
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Paolo Bonzini, 2010/12/15
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/15
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Paolo Bonzini, 2010/12/16
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Michael S. Tsirkin, 2010/12/15
- [Qemu-devel] Re: [PATCH] rtl8139: IO memory is not part of vmstate, Alex Williamson, 2010/12/15