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Message-ID: <8cc36c16-4aa0-9c47-ab2f-c75c1e22772f@citrix.com>
Date:   Tue, 14 Mar 2023 11:41:08 +0000
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From:   Andrew Cooper <Andrew.Cooper3@citrix.com>
Subject: Re: Report in downstream Debian: mpt3sas broken with xen dom0 with
 update to 5.10.149 in 5.10.y.
Content-Language: en-GB
To:     Juergen Gross <jgross@suse.com>,
        Joost Roeleveld <joost@antarean.org>,
        Christoph Hellwig <hch@infradead.org>
Cc:     jejb@linux.ibm.com, Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Salvatore Bonaccorso <carnil@debian.org>,
        sathya.prakash@broadcom.com, suganath-prabu.subramani@broadcom.com,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        MPT-FusionLinux.pdl@broadcom.com, linux-scsi@vger.kernel.org,
        linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
        adi@kriegisch.at
References: <Y1JkuKTjVYrOWbvm@eldamar.lan>
 <85ad4508-b979-c792-e92b-01bc16260dec@acm.org>
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 <30a056c8-071f-4259-3253-75e718af619d@suse.com>
 <Y1bEQMS5SNTbZO/3@infradead.org>
 <858a4288-46ac-d423-a529-b3b77b7fbc8a@citrix.com>
 <20230314111752.EGroupware.TiNRv1BSroWqKL7zQtfNLJ8@_>
 <4c5de098-5cd3-116b-54cb-6972c6c06818@suse.com>
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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.

~Andrew