Re: [libvirt] [Qemu-devel] [PATCH 4/7] qemu: Add monitor APIs to fetch CPUID data from QEMU
Am 25.07.2013 20:02, schrieb Eduardo Habkost:
On Thu, Jul 25, 2013 at 04:09:18PM +0200, Andreas Färber wrote:
> Am 25.07.2013 16:00, schrieb Eduardo Habkost:
>> libvirt
>> needs a way to find out how exactly "-machine foo-1.0 -cpu bar" looks
>> different from "-machine foo-1.1 -cpu bar",
>
> Why? (What's the actual use case?)
libvirt API allows individual CPU features to be configured, so libvirt
needs to know what exactly will be the result of using a
machine-type/CPU-model combination to make sure it will be exactly what
was requested:
http://libvirt.org/formatdomain.html#elementsCPU
That's exactly what you added properties for last minute in v1.5!
libvirt instantiates qemu-system-x86_64 -cpu foo,+x,+y and then checks
that it got what it wanted - if not, die, otherwise continue with
virtualization. One process.
Also, libvirt needs to be able to check if migration to a host is
possible (i.e. if all features enabled by a machine-type/CPU-model
combination are supported by the host) before actually starting the
migration process.
That's one process on the destination with one -machine pc-i440-x.y.
Is the problem possibly rather that -incoming and QMP exclude each
other? Then we should fix that instead by starting incoming migration
from QMP in the same process that we used to check that migration will
be possible without guest-visible changes.
Andreas
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