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Date: Wed, 29 Jul 2015 18:54:16 +0100
From: Anthony PERARD <anthony.perard@citrix.com>
Message-ID: <20150729175416.GN1379@perard.uk.xensource.com>
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Subject: Re: [Qemu-devel] [PATCH for-2.4 0/3] Migration regressions with Xen.
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To: QEMU-devel <qemu-devel@nongnu.org>
Cc: Amit Shah <amit.shah@redhat.com>, Juan Quintela <quintela@redhat.com>, Stefano Stabellini <stefano.stabellini@citrix.com>, Xen Devel <xen-devel@lists.xen.org>

This is a critical issue for Xen as migration either with the same version
of QEMU, or from a previous version of QEMU is broken.

Any suggestion on how to move forward?

On Tue, Jul 28, 2015 at 04:54:42PM +0100, Anthony PERARD wrote:
> Hi,
> 
> We've spotted several regression which prevent migration with Xen using the
> same version of QEMU or from a previous version of QEMU (tryied with 2.2).
> 
> Regression have been introduce by at least:
> - df4b1024526cae3479da3492d6371fd4a7324a03
>   migration: create new section to store global state
> - 61964c23e5ddd5a33f15699e45ce126f879e3e33
>   migration: Add configuration section
> 
> The first patch would fix the default case when we use the machine 'xenfv'.
> 
> But we can also use the machine 'pc' and I don't know how to fix this case.
> The second and third patches are a step in the direction of fixing
> migration with the machine 'pc'.
> 
> I have not look at save/restore for PV guest yet.
> 
> Thanks,
> 
> Anthony PERARD (3):
>   migration: Fix regretion for xenfv machine.
>   migration: Fix global state with Xen.
>   migration: Add configuration section to vmstate with xen.
> 
>  hw/i386/pc_piix.c             | 3 +++
>  include/migration/migration.h | 1 +
>  migration/migration.c         | 7 +++++++
>  migration/savevm.c            | 6 ++++++
>  4 files changed, 17 insertions(+)

-- 
Anthony PERARD