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From: Christoph Hellwig <>
To: "Alex Xu (Hello71)" <>
Cc: Christoph Hellwig <>,,,
Subject: Re: "dma-mapping: remove CONFIG_DMA_REMAP" causes AMD SME boot fail
Date: Wed, 30 Mar 2022 10:55:27 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <1648659326.eabkokyuym.none@localhost>

On Wed, Mar 30, 2022 at 01:51:07PM -0400, Alex Xu (Hello71) wrote:
> Hi,
> 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.

This looks like something in the AMD IOMMU code or it's users can't
deal with vmalloc addresses.  I'll start looking for a culprit ASAP.

  reply	other threads:[~2022-03-30 17:55 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1648659326.eabkokyuym.none.ref@localhost>
2022-03-30 17:51 ` "dma-mapping: remove CONFIG_DMA_REMAP" causes AMD SME boot fail Alex Xu (Hello71)
2022-03-30 17:55   ` Christoph Hellwig [this message]
2022-03-30 18:01   ` Christoph Hellwig
2022-03-30 19:17     ` Alex Xu (Hello71)
2022-03-31  4:08       ` Christoph Hellwig
2022-03-31  6:51   ` Thorsten Leemhuis
2022-04-15 17:58     ` "dma-mapping: remove CONFIG_DMA_REMAP" causes AMD SME boot fail #forregzbot Thorsten Leemhuis

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