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

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Date:   Tue, 14 Mar 2023 13:07:14 +0100
From:   Salvatore Bonaccorso <carnil@...ian.org>
To:     Andrew Cooper <Andrew.Cooper3@...rix.com>
Cc:     Juergen Gross <jgross@...e.com>,
        Joost Roeleveld <joost@...arean.org>,
        Christoph Hellwig <hch@...radead.org>, jejb@...ux.ibm.com,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Bart Van Assche <bvanassche@....org>,
        sathya.prakash@...adcom.com, suganath-prabu.subramani@...adcom.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        adi@...egisch.at
Subject: Re: Report in downstream Debian: mpt3sas broken with xen dom0 with
 update to 5.10.149 in 5.10.y.

Hi Andrew,

On Tue, Mar 14, 2023 at 11:41:08AM +0000, Andrew Cooper wrote:
> On 14/03/2023 11:23 am, Juergen Gross wrote:
> > On 14.03.23 12:17, Joost Roeleveld wrote:
> >>> On Mon, Oct 24, 2022 at 05:28:05PM +0000, Andrew Cooper wrote:
> >>>> I don't know exactly how this translates to Linux internals, but most
> >>>> devices are fine and it's routinely the mpt2/3sas drivers which
> >>>> encounter problems.  It would be lovely if we could get to the
> >>>> bottom of
> >>>> this for once and for all.
> >>>
> >>> So to summarize my two mails: I think te use of dma_get_required_mask
> >>> in mpt3sas is wrong, and the dma_get_required_mask return value from
> >>> xen-swiotlb is also wrong. Fixing either one should fix this problem,
> >>> and I think we should fix both.
> >>
> >> Hi all,
> >>
> >> Is there anything that can be done to get this fixed in xen and the
> >> kernel somehow?
> >> I keep having to manually patch the mpt3sas driver to prevent it from
> >> being able to switch to 32bit mode each time I upgrade the kernel.
> >
> > Just use 5.10.173.
> 
> Its still broken even in 6.1
> 
> We've just stumbled over this yet again in XenServer.

The mentioned commit has been backported to 6.1.16, 5.15.100 and
5.10.173. Is the issue still reproducible with 6.1.16?

Regards,
Salvatore