[PATCH 1/4] qemu: capabilities: add 'packed' capability

Bjoern Walk bwalk at linux.ibm.com
Thu Mar 26 10:35:16 UTC 2020


Bjoern Walk <bwalk at linux.ibm.com> [2020-03-26, 11:32AM +0100]:
> Add the capability for QEMU's packed virtqueues for virtio that supposedly have
> better cache utilization and performance compared to the default split queues.
> 
> Signed-off-by: Bjoern Walk <bwalk at linux.ibm.com>
> ---
>  src/qemu/qemu_capabilities.c                      | 6 ++++++
>  src/qemu/qemu_capabilities.h                      | 1 +
>  tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml | 1 +
>  tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml  | 1 +
>  tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
>  tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml   | 1 +
>  tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml  | 1 +
>  7 files changed, 12 insertions(+)

If this https://www.redhat.com/archives/libvir-list/2020-March/msg00979.html
is accepted then we need to squash this in:

diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
b/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
index e46259e669..61a34da2d8 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml
@@ -144,6 +144,7 @@
   <flag name='rng-builtin'/>
   <flag name='virtio-net.failover'/>
   <flag name='vhost-user-fs'/>
+  <flag name='packed'/>
   <version>4002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>39100242</microcodeVersion>
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