On 8/8/2018 2:42 PM, Chris Apsey wrote:
qemu-system-arm, qemu-system-ppc64, etc. in our environment are all x86
packages, but they perform system-mode emulation (via dynamic
instruction translation) for those target environments. So, you run
qemu-system-ppc64 on an x86 host in order to get a ppc64-emulated VM.
Our use case is specifically directed at reverse engineering binaries
and fuzzing for vulnerabilities inside of those architectures for things
that aren't built for x86, but there are others.
If you were to apt-get install qemu-system and then hit autocomplete,
you'd get a list of archiectures that qemu can emulate on x86 hardware -
that's what we're trying to do incorporate. We still want to run normal
qemu-x86 with KVM virtualization extensions, but we ALSO want to run the
other emulators without the KVM virtualization extensions in order to
have more choice for target environments.
So to me, openstack would interpret this by checking to see if a target
host supports the architecture specified in the image (it does this
correctly), then it would choose the correct qemu-system-xx for spawning
the instance based on the architecture flag of the image, which it
currently does not (it always choose qemu-system-x86_64).
Does that make sense?
OK yeah now I'm following you - running ppc guests on an x86 host
(virt_type=qemu rather than kvm right?).
I would have thought the hw_architecture image property was used for
this somehow to configure the arch in the guest xml properly, like it's
used in a few places [1][2][3].
See [4], I'd think we'd set the guest.arch but don't see that happening.
We do set the guest.os_type though [5].
[1]
https://github.com/openstack/nova/blob/c18b1c1bd646d7cefa3d3e4b25ce59460d1a6ebc/nova/virt/libvirt/driver.py#L4649
[2]
https://github.com/openstack/nova/blob/c18b1c1bd646d7cefa3d3e4b25ce59460d1a6ebc/nova/virt/libvirt/driver.py#L4927
[3]
https://github.com/openstack/nova/blob/c18b1c1bd646d7cefa3d3e4b25ce59460d1a6ebc/nova/virt/libvirt/blockinfo.py#L257
[4] https://libvirt.org/formatcaps.html#elementGuest
[5]
https://github.com/openstack/nova/blob/c18b1c1bd646d7cefa3d3e4b25ce59460d1a6ebc/nova/virt/libvirt/driver.py#L5196
--
Thanks,
Matt
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