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Tasklist

FS#58463 - [linux] kvm wmwrite error and virtual machine slow down with old CPUs (e.g. Intel Core 2

Attached to Project: Arch Linux
Opened by Andreas Baumann (andreas_baumann) - Saturday, 05 May 2018, 06:45 GMT
Last edited by Doug Newgard (Scimmia) - Friday, 01 June 2018, 15:41 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To Tobias Powalowski (tpowa)
Jan Alexander Steffens (heftig)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:

starting a virtual machine with kvm acceleration almost kills the machine
(with high CPU load of systemd-journald). The root cause is in KVM logging
the following error over and over again:

vmwrite error: reg 401e
[ 3368.691017] CPU: 0 PID: 1491 Comm: CPU 0/KVM Tainted: G O 4.16.6-1-ARCH #1
[ 3368.691018] Hardware name: /DP965LT, BIOS MQ96510J.86A.1577.2006.1115.2351 11/15/2006
[ 3368.691019] Call Trace:
[ 3368.691023] dump_stack+0x5c/0x85
[ 3368.691027] vmx_set_cr4+0x1d2/0x210 [kvm_intel]
[ 3368.691045] kvm_set_cr4+0x18e/0x2c0 [kvm]
[ 3368.691051] handle_cr+0x601/0x6a0 [kvm_intel]
[ 3368.691055] ? vmx_vcpu_run+0x2f5/0x5b0 [kvm_intel]
[ 3368.691060] vmx_handle_exit+0xaf/0x14e0 [kvm_intel]
[ 3368.691065] ? vmx_vcpu_run+0x2f5/0x5b0 [kvm_intel]
[ 3368.691069] ? vmx_vcpu_run+0x301/0x5b0 [kvm_intel]
[ 3368.691074] ? vmx_vcpu_run+0x2f5/0x5b0 [kvm_intel]
[ 3368.691078] ? vmx_vcpu_run+0x301/0x5b0 [kvm_intel]
[ 3368.691083] ? vmx_vcpu_run+0x3bd/0x5b0 [kvm_intel]
[ 3368.691102] kvm_arch_vcpu_ioctl_run+0xc39/0x1820 [kvm]

The following patch seemed to solve the issue:

https://bugzilla.redhat.com/show_bug.cgi?id=1566258
https://bodhi.fedoraproject.org/updates/FEDORA-2018-b6be90818
https://patchwork.kernel.org/patch/10353377/

I attached a modified PKGBUILD and the patch.

Note: I didn't check yet, if 4.17 is also affected.

Additional info:
* package version(s): 4.16.6-1
* config and/or log files etc.


Steps to reproduce:
virsh start <name of vm>
check output of systemd journal

   PKGBUILD (8.7 KiB)
   0005-CR4-Write-Slowdown-Old-C... (1.7 KiB)
This task depends upon

Closed by  Doug Newgard (Scimmia)
Friday, 01 June 2018, 15:41 GMT
Reason for closing:  Fixed
Additional comments about closing:  linux 4.16.11-1
Comment by loqs (loqs) - Saturday, 05 May 2018, 07:50 GMT
second iteration of the patch https://patchwork.kernel.org/patch/10372151/ not yet in mainlne
Comment by loqs (loqs) - Saturday, 19 May 2018, 20:17 GMT
https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-4.16/kvm-vmx-update-sec-exec-controls-for-umip-iff-emulating-umip.patch?id=c88d047aade3c6ad77d3eafa80128938f83c92b0
queued for 4.16.11
Edit:
4.16.11 not 4.16.10
Comment by loqs (loqs) - Wednesday, 30 May 2018, 16:02 GMT
@andreas_baumann can you confirm if the issue has been fixed in 4.16.11-1 / 4.16.12-1?
Comment by Andreas Baumann (andreas_baumann) - Thursday, 31 May 2018, 05:40 GMT
Just tested with kernel 4.16.12-1. Looks good, no more messages in the journal.
Comment by Andreas Baumann (andreas_baumann) - Friday, 01 June 2018, 05:39 GMT
Can be closed from my point of view. :-)

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