From: David Woodhouse <dwmw2@infradead.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: "linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
"linux390@de.ibm.com" <linux390@de.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v5 2/3] virtio_pci: Use the DMA API for virtqueues when possible
Date: Sat, 20 Sep 2014 23:01:46 -0700 [thread overview]
Message-ID: <1411279306.23886.1.camel@infradead.org> (raw)
In-Reply-To: <CALCETrUu6hSyw5quP8fCQzB2Rwo17Vd18Pkf-Bese0q0hcxkQw@mail.gmail.com>
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On Sat, 2014-09-20 at 22:48 -0700, Andy Lutomirski wrote:
>
> I'm all for doing this as some kind of bus property, if needed,
> although David Woodhouse may be right that the best solution is to
> *always* have the IOMMU there and to just ask it for an identity map
> if desired.
That's the right solution for x86, certainly. For POWER it's a little
less clear-cut because I don't think the IOMMU normally supports
identity mapping there. You could still do an identity mapping (hell, we
do at the moment) but it'd be a very special case.
--
dwmw2
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next prev parent reply other threads:[~2014-09-21 6:01 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-17 5:22 [PATCH v5 0/3] virtio: Use the DMA API when appropriate Andy Lutomirski
2014-09-17 5:22 ` [PATCH v5 1/3] virtio_ring: Support DMA APIs if requested Andy Lutomirski
2014-09-17 5:22 ` [PATCH v5 2/3] virtio_pci: Use the DMA API for virtqueues when possible Andy Lutomirski
2014-09-17 12:02 ` Benjamin Herrenschmidt
2014-09-17 14:16 ` Michael S. Tsirkin
2014-09-17 16:07 ` Andy Lutomirski
2014-09-17 16:49 ` David Woodhouse
2014-09-19 21:28 ` Benjamin Herrenschmidt
2014-09-19 21:33 ` Benjamin Herrenschmidt
2014-09-20 5:59 ` Andy Lutomirski
2014-09-21 5:03 ` Benjamin Herrenschmidt
2014-09-21 5:05 ` Benjamin Herrenschmidt
2014-09-21 5:48 ` Andy Lutomirski
2014-09-21 6:01 ` David Woodhouse [this message]
2014-09-24 21:41 ` Andy Lutomirski
2014-09-24 21:50 ` Benjamin Herrenschmidt
2014-09-24 21:59 ` Andy Lutomirski
2014-09-24 22:04 ` Benjamin Herrenschmidt
2014-09-24 22:15 ` Andy Lutomirski
2014-09-24 22:38 ` Benjamin Herrenschmidt
2014-09-24 22:49 ` Andy Lutomirski
2014-09-19 21:31 ` Benjamin Herrenschmidt
2014-09-29 18:55 ` Andy Lutomirski
2014-09-29 20:49 ` Benjamin Herrenschmidt
2014-09-29 20:55 ` Andy Lutomirski
2014-09-29 21:06 ` Benjamin Herrenschmidt
2014-09-30 15:38 ` Michael S. Tsirkin
2014-09-30 15:48 ` Andy Lutomirski
2014-09-30 16:19 ` Andy Lutomirski
2014-09-30 17:53 ` Konrad Rzeszutek Wilk
2014-09-30 18:01 ` Andy Lutomirski
2014-10-02 16:36 ` Konrad Rzeszutek Wilk
2014-10-01 6:42 ` Michael S. Tsirkin
2014-09-30 15:53 ` Paolo Bonzini
2014-10-01 7:36 ` Michael S. Tsirkin
2014-09-30 20:05 ` Andy Lutomirski
2014-10-06 9:59 ` Christian Borntraeger
2014-10-06 10:48 ` Benjamin Herrenschmidt
2014-09-17 16:09 ` Ira W. Snyder
2014-09-17 16:15 ` Andy Lutomirski
2014-09-17 5:22 ` [PATCH v5 3/3] virtio_net: Stop doing DMA from the stack Andy Lutomirski
2014-09-19 18:25 ` [PATCH v5 0/3] virtio: Use the DMA API when appropriate Konrad Rzeszutek Wilk
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