From: Julien Grall <julien@xen.org>
To: Christoph Hellwig <hch@lst.de>
Cc: f.fainelli@gmail.com, Stefano Stabellini <sstabellini@kernel.org>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
linux-kernel@vger.kernel.org,
osstest service owner <osstest-admin@xenproject.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
iommu@lists.linux-foundation.org
Subject: Re: Regression when booting 5.15 as dom0 on arm64 (WAS: Re: [linux-linus test] 161829: regressions - FAIL)
Date: Mon, 10 May 2021 19:15:17 +0100 [thread overview]
Message-ID: <8b851596-acf7-9d3b-b08a-848cae5adada@xen.org> (raw)
In-Reply-To: <20210510084057.GA933@lst.de>
Hi Christoph,
On 10/05/2021 09:40, Christoph Hellwig wrote:
> On Sat, May 08, 2021 at 12:32:37AM +0100, Julien Grall wrote:
>> The pointer dereferenced seems to suggest that the swiotlb hasn't been
>> allocated. From what I can tell, this may be because swiotlb_force is set
>> to SWIOTLB_NO_FORCE, we will still enable the swiotlb when running on top
>> of Xen.
>>
>> I am not entirely sure what would be the correct fix. Any opinions?
>
> Can you try something like the patch below (not even compile tested, but
> the intent should be obvious?
>
>
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index 16a2b2b1c54d..7671bc153fb1 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -44,6 +44,8 @@
> #include <asm/tlb.h>
> #include <asm/alternative.h>
>
> +#include <xen/arm/swiotlb-xen.h>
> +
> /*
> * We need to be able to catch inadvertent references to memstart_addr
> * that occur (potentially in generic code) before arm64_memblock_init()
> @@ -482,7 +484,7 @@ void __init mem_init(void)
> if (swiotlb_force == SWIOTLB_FORCE ||
> max_pfn > PFN_DOWN(arm64_dma_phys_limit))
> swiotlb_init(1);
> - else
> + else if (!IS_ENABLED(CONFIG_XEN) || !xen_swiotlb_detect())
> swiotlb_force = SWIOTLB_NO_FORCE;
>
> set_max_mapnr(max_pfn - PHYS_PFN_OFFSET);
I have applied the patch on top of 5.13-rc1 and can confirm I am able to
boot dom0. Are you going to submit the patch?
Thank you for your help!
Best regards,
--
Julien Grall
next prev parent reply other threads:[~2021-05-10 18:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-07 21:00 [linux-linus test] 161829: regressions - FAIL osstest service owner
2021-05-07 23:32 ` Regression when booting 5.15 as dom0 on arm64 (WAS: Re: [linux-linus test] 161829: regressions - FAIL) Julien Grall
2021-05-10 8:40 ` Christoph Hellwig
2021-05-10 18:15 ` Julien Grall [this message]
2021-05-10 19:04 ` Florian Fainelli
2021-05-11 1:46 ` Stefano Stabellini
2021-05-11 6:35 ` Christoph Hellwig
2021-05-11 16:47 ` Regression when booting 5.15 as dom0 on arm64 (WAS: Re: [linux-linus test] 161829: regressions - FAIL)] Stefano Stabellini
2021-05-11 16:49 ` Christoph Hellwig
2021-05-11 16:51 ` Stefano Stabellini
2021-05-11 17:01 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8b851596-acf7-9d3b-b08a-848cae5adada@xen.org \
--to=julien@xen.org \
--cc=boris.ostrovsky@oracle.com \
--cc=f.fainelli@gmail.com \
--cc=hch@lst.de \
--cc=iommu@lists.linux-foundation.org \
--cc=konrad.wilk@oracle.com \
--cc=linux-kernel@vger.kernel.org \
--cc=osstest-admin@xenproject.org \
--cc=sstabellini@kernel.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).