linux-kernel - Re: "dma-mapping: remove CONFIG_DMA

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Date:   Thu, 31 Mar 2022 08:51:51 +0200
From:   Thorsten Leemhuis <linux@...mhuis.info>
To:     regressions@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: "dma-mapping: remove CONFIG_DMA_REMAP" causes AMD SME boot fail

[TLDR: I'm adding the regression report below to regzbot, the Linux
kernel regression tracking bot; all text you find below is compiled from
a few templates paragraphs you might have encountered already already
from similar mails.]

Hi, this is your Linux kernel regression tracker. Sending this just to
the lists, as it's already handled.

On 30.03.22 19:51, Alex Xu (Hello71) wrote:
> 
> After a recent kernel update, booting one of my machines causes it to 
> hang on a black screen. Pressing Lock keys on the USB keyboard does not 
> turn on the indicators, and the machine does not appear on the Ethernet 
> network. I don't have a serial port on this machine. I didn't try 
> netconsole, but I suspect it won't work.
> 
> Setting mem_encrypt=0 seems to resolve the issue. Reverting f5ff79fddf0e 
> ("dma-mapping: remove CONFIG_DMA_REMAP") also appears to resolve the 
> issue.
> 
> The machine in question has an AMD Ryzen 5 1600 and ASRock B450 Pro4.

To be sure below issue doesn't fall through the cracks unnoticed, I'm
adding it to regzbot, my Linux kernel regression tracking bot:

#regzbot ^introduced f5ff79fddf0e
#regzbot title dma: "dma-mapping: remove CONFIG_DMA_REMAP" causes AMD
SME boot fail
#regzbot ignore-activity

If it turns out this isn't a regression, free free to remove it from the
tracking by sending a reply to this thread containing a paragraph like
"#regzbot invalid: reason why this is invalid" (without the quotes).

Ciao, Thorsten