Bug 28567

Summary:	AMD-Vi: Unable to read/write to IOMMU perf counter
Product:	Mageia	Reporter:	Pe Alfa <pealfa>
Component:	Release (media or process)	Assignee:	Kernel and Drivers maintainers <kernel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	Normal	CC:	sysadmin-bugs
Version:	8
Target Milestone:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Source RPM:		CVE:
Status comment:

Description Pe Alfa 2021-03-09 20:39:11 CET

I just installed Mageia 8 (64 bits) in a new Lenovo Ideapad 3 (AMD Ryzen 7 4800h + nVidia GTX 1650) and this error appears at the start:

pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.

I do:
dmesg | grep -e IOMMU
[0.722808] pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf counter.
[0.724431] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[1.392921] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>

Is it a bug? Should I fix it?

Thanks

Pepe Álvarez

Comment 1 Lewis Smith 2021-03-09 21:30:17 CET

Thank you for the report.

Assigning to kernel team.

Assignee: bugsquad => kernel

Comment 2 Pe Alfa 2021-03-23 14:58:25 CET

Hi!

After last update:

uname -a
Linux lenovo.pealfa.duckdns.org 5.10.25-desktop-1.mga8 #1 SMP Sat Mar 20 16:45:02 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

# dmesg | grep -e DMAR -e IOMMU
[    0.764292] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[    0.767103] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[    0.769617] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
[    1.442067] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>

Good news?

Comment 3 Thomas Backlund 2021-03-23 18:04:56 CET

Yep.

the fix for this landed in upstream 5.10.24

Resolution: (none) => FIXED
Status: NEW => RESOLVED