[libvirt PATCH] qemu: re-add padding to the saved state images

[Eric Blake]

On 4/27/20 8:41 AM, Daniel P. Berrangé wrote:
> In the past we added 1024 bytes of padding to saved state images so that
> users can run "virsh managedsave-edit $GUEST" and make XML changes which
> increase the size of the XML document. This padding was accidentally
> lost a while back
> 
>    commit 6b9b21db7079888a05d192b079e68290bdf14a76
>    Author: Peter Krempa <pkrempa at redhat.com>
>    Date:   Wed Feb 17 13:10:11 2016 +0100
> 
>      qemu: Remove unnecessary calculations in qemuDomainSaveMemory
> 
> The original 1024 bytes was unreasonably stingy when we consider that
> the QEMU state is typically going to be many 100's of MB in size. Thus
> this adds 64 KB of padding after the XML which should cope with any
> plausible modifications a user will want to make.
> 
> Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
> ---
>   src/qemu/qemu_driver.c | 17 ++++++++++-------
>   1 file changed, 10 insertions(+), 7 deletions(-)

Reviewed-by: Eric Blake <eblake at redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org