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[Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration
From: |
Christian Ehrhardt |
Subject: |
[Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration |
Date: |
Tue, 23 Mar 2021 11:23:24 -0000 |
As my other repro-code didn't trigger the issue I looked at qemu again
and found that before the failing ioctl->scv call there are plenty other
even some very similar (same?) calls that work just fine.
I wonder if on guest setup qemu (or e.g. the rom we load) might set some
arch-bits or such which then breaks the next "scv 0" call.
I attached the full ioctl log here.
** Attachment added: "ioctl log of qemu until the crash happens"
https://bugs.launchpad.net/qemu/+bug/1920784/+attachment/5480011/+files/qemu-ioctls-util-crash.txt
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https://bugs.launchpad.net/bugs/1920784
Title:
qemu-system-ppc64le fails with kvm acceleration
Status in QEMU:
New
Status in The Ubuntu-power-systems project:
New
Status in glibc package in Ubuntu:
New
Status in qemu package in Ubuntu:
Confirmed
Bug description:
(Suspected glibc issue!)
qemu-system-ppc64(le) fails when invoked with kvm acceleration with
error "illegal instruction"
> qemu-system-ppc64(le) -M pseries,accel=kvm
Illegal instruction (core dumped)
In dmesg:
Facility 'SCV' unavailable (12), exception at 0x7624f8134c0c,
MSR=900000000280f033
Version-Release number of selected component (if applicable):
qemu 5.2.0
Linux kernel 5.11
glibc 2.33
all latest updates as of submitting the bug report
How reproducible:
Always
Steps to Reproduce:
1. Run qemu with kvm acceleration
Actual results:
Illegal instruction
Expected results:
Normal VM execution
Additional info:
The machine is a Raptor Talos II Lite with a Sforza V1 8-core, but was also
observed on a Raptor Blackbird with the same processor.
This was also observed on Fedora 34 beta, which uses glibc 2.33
Also tested on ArchPOWER (unofficial port of Arch Linux for ppc64le) with
glibc 2.33
Fedora 33 and Ubuntu 20.10, both using glibc 2.32 do not have this issue, and
downgrading the Linux kernel from 5.11 to 5.4 LTS on ArchPOWER solved the
problem. Kernel 5.9 and 5.10 have the same issue when combined with glibc2.33
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: qemu-system 1:5.2+dfsg-6ubuntu2
ProcVersionSignature: Ubuntu 5.11.0-11.12-generic 5.11.0
Uname: Linux 5.11.0-11-generic ppc64le
.sys.firmware.opal.msglog: Error: [Errno 13] Permission denied:
'/sys/firmware/opal/msglog'
ApportVersion: 2.20.11-0ubuntu60
Architecture: ppc64el
CasperMD5CheckResult: pass
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Mar 22 14:48:39 2021
InstallationDate: Installed on 2021-03-22 (0 days ago)
InstallationMedia: Ubuntu-Server 21.04 "Hirsute Hippo" - Alpha ppc64el
(20210321)
KvmCmdLine: COMMAND STAT EUID RUID PID PPID %CPU COMMAND
ProcKernelCmdLine: root=UUID=f3d03315-0944-4a02-9c87-09c00eba9fa1 ro
ProcLoadAvg: 1.20 0.73 0.46 1/1054 6071
ProcSwaps:
Filename Type Size Used
Priority
/swap.img file 8388544 0
-2
ProcVersion: Linux version 5.11.0-11-generic (buildd@bos02-ppc64el-002) (gcc
(Ubuntu 10.2.1-20ubuntu1) 10.2.1 20210220, GNU ld (GNU Binutils for Ubuntu)
2.36.1) #12-Ubuntu SMP Mon Mar 1 19:26:20 UTC 2021
SourcePackage: qemu
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDump_list: total 0
acpidump:
cpu_cores: Number of cores present = 8
cpu_coreson: Number of cores online = 8
cpu_smt: SMT=4
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- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Frank Heimes, 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration,
Christian Ehrhardt <=
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Laurent Vivier, 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Laurent Vivier, 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Frank Heimes, 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, sadoon albader, 2021/03/23
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/24
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Christian Ehrhardt , 2021/03/24
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Frank Heimes, 2021/03/24
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Tim Gardner, 2021/03/24
- [Bug 1920784] Re: qemu-system-ppc64le fails with kvm acceleration, Thomas Huth, 2021/03/29