[libvirt] [PATCH 0/4] qemu: Use host-model CPU on s390 by default

[Ján Tomko]

On Thu, Nov 14, 2019 at 04:44:54PM +0100, Jiri Denemark wrote:
>On s390 machines host-passthrough and host-model CPUs result in the same
>guest ABI (with QEMU new enough to be able to tell us what "host" CPU is
>expanded to, which was implemented around 2.9.0). So instead of using
>host-passthrough CPU when there's no CPU specified in a domain XML we
>can safely use host-model and benefit from CPU compatibility checks
>during migration, snapshot restore and similar operations.
>
>
>This series applies on top of "qemu: Store default CPU in domain XML"
>which is already acked, but it's waiting for a QEMU patch to be applied
>to 4.2.0.
>
>You can fetch both series at once using
>
>    git fetch https://gitlab.com/jirkade/libvirt cpu-default-type
>
>Jiri Denemark (4):
>  cpu_conf: Fix default value for CPU match attribute
>  cpu_conf: Don't format empty model for host-model CPUs
>  cpu_s390: Don't check match attribute for host-model CPUs
>  qemu: Use host-model CPU on s390 by default
>
> src/conf/cpu_conf.c                           | 25 ++++----------
> src/conf/cpu_conf.h                           |  2 +-
> src/cpu/cpu_s390.c                            | 18 +++++-----
> src/qemu/qemu_domain.c                        | 33 ++++++++++++-------
> .../ppc64-host+guest-compat-none.xml          |  4 +--
> ...t-cpu-kvm-ccw-virtio-4.2.s390x-latest.args |  4 ++-
> .../cpu-check-default-partial.xml             |  4 +--
> .../cpu-host-model-features.xml               |  1 -
> ...lt-cpu-kvm-ccw-virtio-4.2.s390x-latest.xml |  2 +-
> 9 files changed, 45 insertions(+), 48 deletions(-)
>

Reviewed-by: Ján Tomko <jtomko at redhat.com>

Jano
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