** Changed in: ubuntu-power-systems
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1832622
Title:
QEMU - count cache flush Spectre v2 mitiga
This bug was fixed in the package qemu - 1:2.11+dfsg-1ubuntu7.18
---
qemu (1:2.11+dfsg-1ubuntu7.18) bionic; urgency=medium
* d/p/ubuntu/lp-1832622-*: count cache flush Spectre v2 mitigation for ppc64
(LP: #1832622)
* d/p/ubuntu/lp-1840745-*: add amd ssbd / no-ssbd features (LP
This bug was fixed in the package qemu - 1:3.1+dfsg-2ubuntu3.4
---
qemu (1:3.1+dfsg-2ubuntu3.4) disco; urgency=medium
* d/p/ubuntu/lp-1832622-*: count cache flush Spectre v2 mitigation for ppc64
(LP: #1832622)
* d/p/ubuntu/lp-1836154-*: add HW CPU model for newer s390x machine
After discussing this with the Team I really think it is ok to release this.
As stated before we confirmed:
- that on a good kernel the fix works
- the fix doesn't break features if not running on the new kernel
- the fix is confirmed to get in the kernel soon (this kernel cycle)
In addition relea
Thanks a lot Fabiano!
So I summarize:
- #7 is in no way a degradation to #4:
- all cap-ibs= modes are failing on that before and after
- that means the new qemu didn't break anything in that regard
- #9 confirms that as soon as we have a fixed kernel under that new disco-qemu
it will work for
Here is test #9 (#8 is the same as #4 from my previous tests. And not of
much help since Disco-updates QEMU (v=1:3.1+dfsg-2ubuntu3.3) does not
have cap-ibs=workaround):
*** 9- Bionic-proposed kernel + Disco-proposed QEMU
$ uname -r; qemu-system-ppc64 --version | head -n 1
4.15.0-60-generic
QE
That is the effect of the lack of "2b57ecd0208f KVM: PPC: Book3S: Add
count cache flush parameters to kvmppc_get_cpu_char()" in Disco.
QEMU checks for KVM_PPC_CPU_BEHAV_FLUSH_COUNT_CACHE which is introduced
in the above commit:
(From lp-1832622-0002-target-ppc-spapr-Add-workaround-option-to-
SPAP
Thanks a lot faro...@br.ibm.com.
Especially for noting the known firmware featues influencing this in your case
and then combining cap-ibs=workaround,cap-ccf-assist=on to prove the new
features work.
I see that cap-ccf-assist=on can be used and successfully grants the guest
[0.00] count-
** Changed in: ubuntu-power-systems
Status: Confirmed => Fix Committed
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Title:
QEMU - count cache flush Spectre v2 mitigatio
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
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Title:
QEMU - count cache flush Spectre v2 mitigat
Per my Tests we already know that on DD2.0 HW things are fine, you can't enable
CCF which is expected, but it doesn't break formerly working cases there.
And I'm not sure if there is DD2.3 HW in the wild already.
Furthermore I was in contact with Leonardo yesterday, he is working with
the Authors
** Changed in: linux (Ubuntu Disco)
Status: Confirmed => In Progress
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Title:
QEMU - count cache flush Spectre v2 mitigation
Confirmed that the Disco kernel is only missing 2b57ecd0208f ("KVM: PPC:
Book3S: Add count cache flush parameters to kvmppc_get_cpu_char()") from
the patchset referenced in bug 1822870.
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Bumping priority up to high after discussions with IBM.
** Changed in: ubuntu-power-systems
Importance: Medium => High
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Title:
Q
I think I found the missing kernel bit.
As reported it needs:
2b57ecd0208f KVM: PPC: Book3S: Add count cache flush parameters to
kvmppc_get_cpu_char()
Which was brought into Bionic/Cosmic already as part of bug LP1822870.
This is only needed when I'd be on new HW/FW
Bionic: $ grep -Hrn KVM_PPC
Back in bug 1822870 it was reported that the Disco kernel is only
missing 92edf8df which is still applied to Disco these days. Maybe due
to that 2b57ecd0208f was lost.
@Kernel Team - could you go through all changes that made up bug 1822870
and ensure whatever is missing will be added to Disco?
-
Lacking better options I gave this some extra testing on a pre DD2.3 P9 box.
revision: 2.2 (pvr 004e 1202)
I though at least CCF=off I should be able to test with these chips and that
worked fine.
Summary:
- the new versions make cap-ibs=fixed-ibs work on DD2.2
- CCF=off works with Bionic
FYI - the related autopkgtest issues would now be resolved.
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Title:
QEMU - count cache flush Spectre v2 mitigation (CVE) (required
May I ask which kernel was used while testing on disco - was is the
kernel from main/updates or proposed (5.0.0.27)?
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Title:
QEMU -
** Changed in: ubuntu-power-systems
Status: Fix Committed => Confirmed
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Title:
QEMU - count cache flush Spectre v2 mitigatio
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: New => Confirmed
** Changed in: linux (Ubuntu Disco)
Importance: Undecided => High
** No longer affects: linux (Ubuntu Cosmic)
** No longer affects: linux (Ubuntu Eo
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