diff options
| author | Eduardo Habkost <ehabkost@redhat.com> | 2019-08-16 14:07:50 -0300 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2019-09-03 14:39:46 -0300 |
| commit | fea374e7c8079563bca7c8fac895c6a880f76adc (patch) | |
| tree | 889f551444db611868c18c38327256505cf1aa17 /hw/i386 | |
| parent | 23d9cff4897cf983b0570b8676a093d829da019d (diff) | |
pc: Don't make die-id mandatory unless necessary
We have this issue reported when using libvirt to hotplug CPUs:
https://bugzilla.redhat.com/show_bug.cgi?id=1741451
Basically, libvirt is not copying die-id from
query-hotpluggable-cpus, but die-id is now mandatory.
We could blame libvirt and say it is not following the documented
interface, because we have this buried in the QAPI schema
documentation:
> Note: currently there are 5 properties that could be present
> but management should be prepared to pass through other
> properties with device_add command to allow for future
> interface extension. This also requires the filed names to be kept in
> sync with the properties passed to -device/device_add.
But I don't think this would be reasonable from us. We can just
make QEMU more flexible and let die-id to be omitted when there's
no ambiguity. This will allow us to keep compatibility with
existing libvirt versions.
Test case included to ensure we don't break this again.
Fixes: commit 176d2cda0dee ("i386/cpu: Consolidate die-id validity in smp context")
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20190816170750.23910-1-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'hw/i386')
| -rw-r--r-- | hw/i386/pc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 3494423d63..c7200b0b54 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -2421,6 +2421,14 @@ static void pc_cpu_pre_plug(HotplugHandler *hotplug_dev, int max_socket = (ms->smp.max_cpus - 1) / smp_threads / smp_cores / pcms->smp_dies; + /* + * die-id was optional in QEMU 4.0 and older, so keep it optional + * if there's only one die per socket. + */ + if (cpu->die_id < 0 && pcms->smp_dies == 1) { + cpu->die_id = 0; + } + if (cpu->socket_id < 0) { error_setg(errp, "CPU socket-id is not set"); return; |