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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Message-ID: <Y1bEQMS5SNTbZO/3@infradead.org>
Date:   Mon, 24 Oct 2022 09:58:40 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     jejb@...ux.ibm.com, Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Bart Van Assche <bvanassche@....org>,
        Salvatore Bonaccorso <carnil@...ian.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.

On Mon, Oct 24, 2022 at 03:20:43PM +0200, Juergen Gross wrote:
> Dom0 is (normally) a PV domain, so the physical memory can be still above
> 4 GB even with dom0_mem set to 4GB.

Which means that we need to ensure the DMA ops for Xen-PV (which is
always xen-swiotlb I think?) need to return DMA_BIT_MASK(64) or whatever
is the highest possible address.