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Date: Tue, 17 Jul 2012 19:25:21 +0100
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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Subject: Re: [Qemu-devel] [PATCH 4/4] xen: Always set the vram dirty during
	migration.
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To: Anthony PERARD <anthony.perard@citrix.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>, QEMU-devel <qemu-devel@nongnu.org>, Luiz Capitulino <lcapitulino@redhat.com>, Avi Kivity <avi@redhat.com>, Xen Devel <xen-devel@lists.xen.org>

On Tue, 17 Jul 2012, Anthony PERARD wrote:
> Because the call to track the dirty bit in the video ram during migration won't
> work (it returns -1), we set dirtybit on the all video ram.
> 
> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
> ---
>  xen-all.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
> 
> diff --git a/xen-all.c b/xen-all.c
> index 498883b..00bdb50 100644
> --- a/xen-all.c
> +++ b/xen-all.c
> @@ -502,6 +502,11 @@ static void xen_sync_dirty_bitmap(XenIOState *state,
>          return;
>      }
>  
> +    if (unlikely(xen_in_migration)) {
> +        /* track_dirty_vram does not work during migration */
> +        memory_region_set_dirty(framebuffer, 0, size);
> +        return;
> +    }
>      rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
>                                   start_addr >> TARGET_PAGE_BITS, npages,
>                                   bitmap);

Why are you setting the entire framebuffer dirty?
We should set dirty only the actualy region that is supposed to be
dirty.