This bug was fixed in the package autopkgtest - 5.25ubuntu1
---------------
autopkgtest (5.25ubuntu1) kinetic; urgency=medium
* qemu: fix the ppc64le arch name in kvm_compatible().
Upstream cherry-pick (93fd5ea9). (LP: #1988527)
-- Paride Legovini <par...@ubuntu.com> Wed, 07 Sep 2022 17:28:05 +0200
** Changed in: autopkgtest (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1988527
Title:
autopkgtest_qemu doesn't use accel=kvm on ppc64le, being fully
unusable on that arch
Status in autopkgtest package in Ubuntu:
Fix Released
Status in autopkgtest source package in Jammy:
Triaged
Status in autopkgtest package in Debian:
Fix Committed
Bug description:
On Power9 the qemu based autopkgtest commands create VMs that are
extremely slow and fail with obscure errors (partially discussed in
LP: #1973628, comment 8). This can be reproduced for example by
running:
autopkgtest-buildvm-ubuntu-cloud -v -r jammy --ram-size 1024
but autopkgtest-virt-qemu is also affected. The extreme slowness of
the VMs made me think that something was off with the virtualization
settings. I modified autopkgtest_qemu.py so that qemu-system-ppc64le
is called with '-machine accel=kvm' (which I think is the same as
'-machine pseries,accel=kvm' with pseries being the default machine
type).
With this change everything is very fast and reliable. These warnings
also went away:
qemu-system-ppc64le: warning: TCG doesn't support requested feature,
cap-cfpc=workaround
qemu-system-ppc64le: warning: TCG doesn't support requested feature,
cap-sbbc=workaround
qemu-system-ppc64le: warning: TCG doesn't support requested feature,
cap-ibs=workaround
qemu-system-ppc64le: warning: TCG doesn't support requested feature,
cap-ccf-assist=on
indicating that we were using TCG emulation before.
I imagine that Qemu has good reasons not to default to accel=kvm or
accel=kvm:tcg on ppc64, but think it's reasonable to assume it's
available and enable it in autopkgtest.
We can fix this in autopkgtest upstream, but it would be nice to
verify if this is an issue with Debian too before submitting a salsa
MR.
[1] https://wiki.qemu.org/Documentation/TCG
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