Bug#978479: linux-image-5.9.0-5-amd64: NVMe AMD-Vi IO_PAGE_FAULT only with hardware IOMMU

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#978479: linux-image-5.9.0-5-amd64: NVMe AMD-Vi IO_PAGE_FAULT only with hardware IOMMU
Date	2021-05-02 15:40 +0200
Message-ID	<Cakue-1eV-13@gated-at.bofh.it> (permalink)
References	<Cakue-1eV-15@gated-at.bofh.it> <Cakue-1eV-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Lisandro,

On Sun, Dec 27, 2020 at 07:22:06PM -0300, Lisandro Damián Nicanor Pérez Meyer wrote:
> Package: src:linux
> Version: 5.9.15-1
> Severity: important
> Tags: upstream
> Forwarded: https://bugzilla.kernel.org/show_bug.cgi?id=202665
> X-Debbugs-Cc: lisandro@debian.org
> 
> Hi! I'm filing this bug for 5.9.0-5-amd64 but it also happens with 5.9.0-4-amd64.
> 
> After upgrading Plasma (KDE) to current unstable and trying to log in I
> get nnme/AMD-Vi page faults (see attached photo). I could not determine
> what specifically in Plasma triggers the issue, in fact I had to log in
> via ssh prior to log in to get the demsg output.
> 
> I tried to log in with other desktops and they did not show the problem.
> 
> At first I thought it was a Plasma or video driver-triggered issue. I even
> tried installing the proprietary NVidia driver to see if it was
> somehow triggered by the video driver and no luck.
> 
> And then I found:
> 
>   https://bugzilla.kernel.org/show_bug.cgi?id=202665
> 
> The work around in that bug (using "iommu=soft" as a kernel parameter)
> worked like a charm. The only thing I could not check (because I don't
> know how) is if it's really related to fstrim/discard.
> 
> I'm using the above URL as forwarded tag, but of course feel free to
> change that as needed.
> 
> If I can be of further help please just ping me.
> 
> Kinds regards and **thanks** for your work

is this something you still can reproduce with the 5.10 kernel in
unstable?

Regards,
Salvatore

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Bug#978479: linux-image-5.9.0-5-amd64: NVMe AMD-Vi IO_PAGE_FAULT only with hardware IOMMU Salvatore Bonaccorso <carnil@debian.org> - 2021-05-02 15:40 +0200
  Bug#978479: linux-image-5.9.0-5-amd64: NVMe AMD-Vi IO_PAGE_FAULT only with hardware IOMMU Salvatore Bonaccorso <carnil@debian.org> - 2021-05-02 16:10 +0200

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