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Date:   Mon, 24 Oct 2022 09:58:40 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Juergen Gross <jgross@suse.com>
Cc:     jejb@linux.ibm.com, Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
        Bart Van Assche <bvanassche@acm.org>,
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        "Martin K. Petersen" <martin.petersen@oracle.com>,
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        linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
        adi@kriegisch.at
Subject: Re: Report in downstream Debian: mpt3sas broken with xen dom0 with
 update to 5.10.149 in 5.10.y.
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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.