** Tags removed: server-todo
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Title:
EPYC-Rome model without XSAVES may break live migration since the
removal of the flag on the physical CPU
Hi Giuseppe,
That's good news; thanks for testing!
Yes, that's correct. I'll review the patch for SRU considerations (e.g.,
potential side-effects/regressions for existing users, not always
directly clear from the code changes) and proceed if all is OK.
** Also affects: nova (Ubuntu)
Hello Mauricio,
thanks for providing the nova patch. It worked as expected.
I installed on a node with xsaves enabled and updated nova.conf
# dpkg -l | grep nova
ii nova-api-metadata 2:21.2.4-0ubuntu2.7~ppa3
all OpenStack Compute -
Hi Giuseppe,
Please test nova version 2:21.2.4-0ubuntu2.7~ppa3 in the PPA.
(It's finished building and should be published in some time.)
The config change should be something along the lines of
`cpu_model_extra_flags = -xsaves`
I couldn't test the package/functionality yet, but all of the
Hmm, sorry, please hold; the unit tests caught an error.
I'll check that on Monday.
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Title:
EPYC-Rome model without XSAVES may break live
Hi Giuseppe,
You're right, libvirt checks the specified model against its known
models.
However, the EPYC-Rome (not-v4) doesn't specify 'xsaves', just EPYC-Milan,
so it _seems_ the feature came from the default with cpu_model host-model,
which perhaps found EPYC Milan model closer to the host
One thing I notice is that the libvirt xml from EPYC at
/usr/share/libvirt/cpu_map/x86_EPYC-Rome.xml ofc is not updated but also
a new one for using -v4 is not rendered.
That means I can't instruct nova to use EPYC-Rome-v4 with
# grep -i epyc /etc/nova/nova.conf
cpu_model = EPYC-Rome-v4
because
Hello Sergio,
thanks for providing the patch.
I have installed qemu on my test machine. The new epyc-rome-v4 is now
listed by qemu
```
# qemu-system-x86_64 -enable-kvm -cpu help| grep -i epyc-rome-v
x86 EPYC-Rome-v1 AMD EPYC-Rome Processor
x86 EPYC-Rome-v2
Hello Giuseppe,
Thank you. I went ahead and backported the necessary patches. In
total, I had to backport the following upstream commits:
fb00aa61267c8b9c57a2d1a1fa1e336d02e3bcd1
d7c72735f618a7ee27ee109d8b1468193734606a
cca0a000d06f897411a8af4402e5d0522bbe450b
I uploaded a version of QEMU
** Changed in: qemu (Ubuntu)
Assignee: (unassigned) => Sergio Durigan Junior (sergiodj)
** Tags added: server-todo
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Title:
EPYC-Rome model
Hello Sergio,
I can help with testing. I have access to EPYC-Rome CPU machines.
Thanks
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Title:
EPYC-Rome model without XSAVES may break live
Hello Jan,
Thank you for reporting this bug, and for providing a good initial
analysis of the problem.
Would you have access to a host with an EPYC-Rome CPU where you can run
some tests? This is something that needs to be done in order to proceed
here, especially if we indeed decide to SRU this
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: qemu (Ubuntu)
Status: New => Confirmed
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