From: bugzilla-daemon@bugzilla.kernel.org
To: kvm@vger.kernel.org
Subject: [Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter
Date: Sat, 27 Feb 2021 15:21:37 +0000 [thread overview]
Message-ID: <bug-201753-28872-RtVJd4OEq4@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-201753-28872@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=201753
--- Comment #17 from David Coe (david.coe@live.co.uk) ---
Again, good day!
Two re-builds using Alex's (one-line) patch, for kernels 5.8.18 and 5.10.11.
Both give on the Ryzen 2400G:
[ 0.374138] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[ 0.374141] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[ 0.375457] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4
counters/bank).
[ 0.626269] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
I don't know how significant an extra 125 msec on boot time is but, on grounds
of simplicity and elegance, I'd vote for Alex :-). Are there any downsides?
Much appreciated all.
David
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next prev parent reply other threads:[~2021-02-27 15:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-201753-28872@https.bugzilla.kernel.org/>
2020-03-27 20:58 ` [Bug 201753] AMD-Vi: Unable to write to IOMMU perf counter bugzilla-daemon
2020-03-27 21:06 ` bugzilla-daemon
2021-02-02 1:33 ` bugzilla-daemon
2021-02-06 3:42 ` bugzilla-daemon
2021-02-06 4:01 ` bugzilla-daemon
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2021-02-27 15:21 ` bugzilla-daemon [this message]
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