linux-kernel - Report in downstream Debian: mpt3sas broken with xen dom0 with update to 5.10.149 in 5.10.y.

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Date:   Fri, 21 Oct 2022 11:22:00 +0200
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        sathya.prakash@...adcom.com, sreekanth.reddy@...adcom.com,
        suganath-prabu.subramani@...adcom.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        MPT-FusionLinux.pdl@...adcom.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, adi@...egisch.at
Subject: Report in downstream Debian: mpt3sas broken with xen dom0 with
 update to 5.10.149 in 5.10.y.

Hi,

We got the following report in Debian after an update from 5.10.140 to
the current 5.10.149. Full quoting below (from
https://bugs.debian.org/1022126). Does this ring some bell about known
regressions?
On Thu, Oct 20, 2022 at 05:21:03PM +0200, Adi Kriegisch wrote:
> Package: linux-image-5.10.0-19-amd64
> Version: 5.10.149-1
> Severity: important
> 
> Dear maintainers,
> 
> with the upgrade to the latest bullseye kernel (5.10.149-1), our xen setup
> is unbootable due to swiotlb buffer errors:
>   | sd 0:0:0:0: scsi_dma_map failed: request for 401408 bytes!
> and
>   | mpt3sas 0000:01:00.0: swiotlb buffer is full (sz: 401408 bytes),
>   |     total 32768 (slots), used 0 (slots)
> (the byte sizes vary between boots).
> 
> After reading bug #850425[1], we also tried to force 32bit mode in the
> mpt3sas driver by specifying a dom0 memory below 4G; this lets the machine
> boot, but almost immediately after that fails with the same error. Notable
> difference is that the used slots are 128.
> 
> Xen commandline:
>   dom0_mem=4096M,max:4096M dom0_max_vcpus=4 dom0_vcpus_pin
>   ucode=scan xpti=dom0=false,domu=true gnttab_max_frames=128
> 
> Using dom0-iommu=map-inclusive in some combinations with swiotlb on the
> kernel commandline gives us some used slots (way below 128) in the error
> message even in 64bit dma mode in the mpt3sas driver.
> 
> The kernel works when booted without xen. We'd be more than happy to get
> pointers on how to fix that issue or patches to test!
> 
> Thanks for your help!
> 
> -- Adi
> 
> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850425

Regards,
Salvatore