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Date:   Tue, 11 May 2021 18:49:33 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Stefano Stabellini <sstabellini@kernel.org>
Cc:     Christoph Hellwig <hch@lst.de>, Julien Grall <julien@xen.org>,
        f.fainelli@gmail.com,
        "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
        linux-kernel@vger.kernel.org,
        osstest service owner <osstest-admin@xenproject.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        iommu@lists.linux-foundation.org
Subject: Re: Regression when booting 5.15 as dom0 on arm64 (WAS: Re:
 [linux-linus test] 161829: regressions - FAIL)]
Message-ID: <20210511164933.GA19775@lst.de>
References: <osstest-161829-mainreport@xen.org> <4ea1e89f-a7a0-7664-470c-b3cf773a1031@xen.org> <20210510084057.GA933@lst.de> <alpine.DEB.2.21.2105101818260.5018@sstabellini-ThinkPad-T480s> <20210511063558.GA7605@lst.de> <alpine.DEB.2.21.2105110925430.5018@sstabellini-ThinkPad-T480s>
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On Tue, May 11, 2021 at 09:47:33AM -0700, Stefano Stabellini wrote:
> That's a much better plan. It is also not super urgent, so maybe for now
> we could add an explicit check for io_tlb_default_mem != NULL at the
> beginning of xen_swiotlb_init? So that at least we can fail explicitly
> or ignore it explicitly rather than by accident.

Fine with me.  Do you want to take over from here and test and submit
your version?