linux-kernel - Re: [PATCH 1/1] s390/cio: fix virtio-ccw DMA without PV

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Message-ID: <20190930145607.GA18163@lst.de>
Date:   Mon, 30 Sep 2019 16:56:07 +0200
From:   Christoph Hellwig <hch@....de>
To:     Halil Pasic <pasic@...ux.ibm.com>
Cc:     Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Robin Murphy <robin.murphy@....com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Janosch Frank <frankja@...ux.ibm.com>
Subject: Re: [PATCH 1/1] s390/cio: fix virtio-ccw DMA without PV

The code looks fine, but I still very much disagree with the workaround
comments.  The different mask for allocations vs streaming mappings is
exactly how the DMA API is intended to work.