[libvirt PATCH] qemu: remove default audio backend for migratable XML

[Michal Prívozník]

On 7/8/21 12:01 PM, Daniel P. Berrangé wrote:
> When seeing a guest with a sound device, and no audio backend, we
> automatically add an audio backend XML element based on the historical
> QEMU driver behaviour. Unfortunately when we live migrate back to an
> old libvirt, it may not understand the audio driver type we configured.
> We thus need to strip the default audio backend when migrating.
> 
> Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
> ---
>  src/libvirt_private.syms |   1 +
>  src/qemu/qemu_domain.c   | 128 ++++++++++++++++++++++++++++++---------
>  2 files changed, 101 insertions(+), 28 deletions(-)


You'll need to squash this in:

diff --git i/tests/qemumigrationcookiexmldata/full-xml2xml-out.xml w/tests/qemumigrationcookiexmldata/full-xml2xml-out.xml
index 013cfb1eb2..a07dd1f147 100644
--- i/tests/qemumigrationcookiexmldata/full-xml2xml-out.xml
+++ w/tests/qemumigrationcookiexmldata/full-xml2xml-out.xml
@@ -142,7 +142,6 @@
       <sound model='ich6'>
         <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
       </sound>
-      <audio id='1' type='spice'/>
       <video>
         <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
         <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>


But of course qemumigrationcookietest fails if you run just one specific test case, because it depends on previous test cases to prepare domain object. Le sigh.

Reviewed-by: Michal Privoznik <mprivozn at redhat.com>

Michal