From: Andy Lutomirski <luto@amacapital.net>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Joerg Roedel <jroedel@suse.de>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
Christoph Hellwig <hch@lst.de>,
David Woodhouse <dwmw2@infradead.org>, KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff
Date: Thu, 19 Nov 2015 13:59:05 -0800 [thread overview]
Message-ID: <CALCETrXXsThXpbRMQ_CWTsq7_HiRFaK+dTeDYaz5cSm0QtoW_w@mail.gmail.com> (raw)
In-Reply-To: <20151119153821-mutt-send-email-mst@redhat.com>
On Nov 19, 2015 5:45 AM, "Michael S. Tsirkin" <mst@redhat.com> wrote:
>
> On Tue, Oct 27, 2015 at 11:38:57PM -0700, Andy Lutomirski wrote:
> > This switches virtio to use the DMA API unconditionally. I'm sure
> > it breaks things, but it seems to work on x86 using virtio-pci, with
> > and without Xen, and using both the modern 1.0 variant and the
> > legacy variant.
>
> So thinking hard about it, I don't see any real drawbacks to making this
> conditional on a new feature bit, that Xen can then set..
Can you elaborate? If I run QEMU, hosting Xen, hosting Linux, and the
virtio device is provided by QEMU, then how does Xen set the bit?
Similarly, how would Xen set the bit for a real physical device?
--Andy
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto@amacapital.net>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-s390 <linux-s390@vger.kernel.org>,
KVM <kvm@vger.kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Joerg Roedel <jroedel@suse.de>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v3 0/3] virtio DMA API core stuff
Date: Thu, 19 Nov 2015 13:59:05 -0800 [thread overview]
Message-ID: <CALCETrXXsThXpbRMQ_CWTsq7_HiRFaK+dTeDYaz5cSm0QtoW_w@mail.gmail.com> (raw)
In-Reply-To: <20151119153821-mutt-send-email-mst@redhat.com>
On Nov 19, 2015 5:45 AM, "Michael S. Tsirkin" <mst@redhat.com> wrote:
>
> On Tue, Oct 27, 2015 at 11:38:57PM -0700, Andy Lutomirski wrote:
> > This switches virtio to use the DMA API unconditionally. I'm sure
> > it breaks things, but it seems to work on x86 using virtio-pci, with
> > and without Xen, and using both the modern 1.0 variant and the
> > legacy variant.
>
> So thinking hard about it, I don't see any real drawbacks to making this
> conditional on a new feature bit, that Xen can then set..
Can you elaborate? If I run QEMU, hosting Xen, hosting Linux, and the
virtio device is provided by QEMU, then how does Xen set the bit?
Similarly, how would Xen set the bit for a real physical device?
--Andy
next prev parent reply other threads:[~2015-11-19 21:59 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-28 6:38 [PATCH v3 0/3] virtio DMA API core stuff Andy Lutomirski
2015-10-28 6:38 ` [PATCH v3 1/3] virtio_net: Stop doing DMA from the stack Andy Lutomirski
2015-10-28 7:08 ` Michael S. Tsirkin
2015-10-28 7:08 ` Michael S. Tsirkin
2015-10-28 6:38 ` Andy Lutomirski
2015-10-28 6:38 ` [PATCH v3 2/3] virtio_ring: Support DMA APIs Andy Lutomirski
2015-10-28 6:38 ` Andy Lutomirski
2015-10-28 6:39 ` [PATCH v3 3/3] virtio_pci: Use the DMA API Andy Lutomirski
2015-10-28 6:39 ` Andy Lutomirski
2015-10-28 6:53 ` [PATCH v3 0/3] virtio DMA API core stuff David Woodhouse
2015-10-28 6:53 ` David Woodhouse
2015-10-28 7:09 ` Andy Lutomirski
2015-10-28 7:09 ` Andy Lutomirski
2015-10-28 7:17 ` Michael S. Tsirkin
2015-10-28 7:17 ` Michael S. Tsirkin
2015-10-28 7:40 ` Christian Borntraeger
2015-10-28 7:40 ` Christian Borntraeger
2015-10-28 8:09 ` David Woodhouse
2015-10-28 8:09 ` David Woodhouse
2015-10-28 11:35 ` Michael S. Tsirkin
2015-10-28 11:35 ` Michael S. Tsirkin
2015-10-28 13:35 ` David Woodhouse
2015-10-28 13:35 ` David Woodhouse
2015-10-28 14:05 ` Michael S. Tsirkin
2015-10-28 14:05 ` Michael S. Tsirkin
2015-10-28 14:13 ` David Woodhouse
2015-10-28 14:13 ` David Woodhouse
2015-10-28 14:22 ` Michael S. Tsirkin
2015-10-28 14:22 ` Michael S. Tsirkin
2015-10-28 14:32 ` David Woodhouse
2015-10-28 14:32 ` David Woodhouse
2015-10-28 16:12 ` Michael S. Tsirkin
2015-10-28 22:51 ` Andy Lutomirski
2015-10-28 22:51 ` Andy Lutomirski
2015-10-29 9:01 ` Michael S. Tsirkin
2015-10-29 9:01 ` Michael S. Tsirkin
2015-10-29 16:18 ` David Woodhouse
2015-10-29 16:18 ` David Woodhouse
2015-11-08 10:37 ` Michael S. Tsirkin
2015-11-08 10:37 ` Michael S. Tsirkin
2015-11-08 11:49 ` Joerg Roedel
2015-11-08 11:49 ` Joerg Roedel
2015-11-10 15:02 ` Michael S. Tsirkin
2015-11-10 15:02 ` Michael S. Tsirkin
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 18:54 ` Andy Lutomirski
2015-11-11 10:05 ` Michael S. Tsirkin
2015-11-11 10:05 ` Michael S. Tsirkin
2015-11-11 15:56 ` Andy Lutomirski
2015-11-11 22:30 ` David Woodhouse
2015-11-11 22:30 ` David Woodhouse
2015-11-12 11:09 ` Michael S. Tsirkin
2015-11-12 11:09 ` Michael S. Tsirkin
2015-11-12 12:18 ` David Woodhouse
2015-11-12 12:18 ` David Woodhouse
2015-11-11 15:56 ` Andy Lutomirski
2015-11-22 13:06 ` Marcel Apfelbaum
2015-11-22 13:06 ` Marcel Apfelbaum
2015-11-22 15:54 ` David Woodhouse
2015-11-22 15:54 ` David Woodhouse
2015-11-22 17:04 ` Marcel Apfelbaum
2015-11-22 17:04 ` Marcel Apfelbaum
2015-11-22 22:11 ` Michael S. Tsirkin
2015-11-22 22:11 ` Michael S. Tsirkin
2015-11-08 12:00 ` David Woodhouse
2015-11-08 12:00 ` David Woodhouse
2015-10-30 15:16 ` Joerg Roedel
2015-10-30 15:16 ` Joerg Roedel
2015-11-11 9:11 ` Michael S. Tsirkin
2015-11-11 9:11 ` Michael S. Tsirkin
2015-10-30 16:54 ` David Woodhouse
2015-10-30 16:54 ` David Woodhouse
2015-11-03 10:24 ` Paolo Bonzini
2015-11-03 10:24 ` Paolo Bonzini
2015-10-28 16:12 ` Michael S. Tsirkin
2015-10-28 8:36 ` Benjamin Herrenschmidt
2015-10-28 8:36 ` Benjamin Herrenschmidt
2015-10-28 11:23 ` Michael S. Tsirkin
2015-10-28 11:23 ` Michael S. Tsirkin
2015-10-28 13:37 ` David Woodhouse
2015-10-28 13:37 ` David Woodhouse
2015-10-28 14:07 ` Michael S. Tsirkin
2015-10-28 14:07 ` Michael S. Tsirkin
2015-11-19 13:45 ` Michael S. Tsirkin
2015-11-19 13:45 ` Michael S. Tsirkin
2015-11-19 21:59 ` Andy Lutomirski [this message]
2015-11-19 21:59 ` Andy Lutomirski
2015-11-19 23:38 ` David Woodhouse
2015-11-19 23:38 ` David Woodhouse
2015-11-20 2:56 ` Benjamin Herrenschmidt
2015-11-20 2:56 ` Benjamin Herrenschmidt
2015-11-20 8:34 ` Michael S. Tsirkin
2015-11-20 8:34 ` Michael S. Tsirkin
2015-11-20 8:21 ` Michael S. Tsirkin
2015-11-20 8:21 ` Michael S. Tsirkin
2015-11-22 15:58 ` David Woodhouse
2015-11-22 15:58 ` David Woodhouse
2015-11-22 21:52 ` Michael S. Tsirkin
2015-11-22 21:52 ` Michael S. Tsirkin
2015-11-22 22:21 ` David Woodhouse
2015-11-22 22:21 ` David Woodhouse
2015-11-23 7:56 ` Michael S. Tsirkin
2015-11-23 7:56 ` Michael S. Tsirkin
2015-11-22 22:21 ` David Woodhouse
2015-11-22 22:21 ` David Woodhouse
2015-11-20 6:56 ` Michael S. Tsirkin
2015-11-20 6:56 ` Michael S. Tsirkin
2015-11-20 7:47 ` Michael S. Tsirkin
2015-11-20 7:47 ` Michael S. Tsirkin
-- strict thread matches above, loose matches on Subject: below --
2015-10-28 6:38 Andy Lutomirski
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