From: Paolo Bonzini <pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: "Michael S. Tsirkin"
<mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: Kevin Wolf <kwolf-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
cornelia.huck-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org,
Wei Liu <wei.liu2-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>,
Stefan Hajnoczi
<stefanha-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
qemu-block-qX2TKyscuCcdnm+yROfE0A@public.gmane.org,
Stefano Stabellini
<stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>,
qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org,
peterx-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Christian Borntraeger
<borntraeger-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Andy Lutomirski <luto-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Amit Shah <amit.shah-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Anthony PERARD
<anthony.perard-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>,
Jason Wang <jasowang-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH V2 RFC] fixup! virtio: convert to use DMA api
Date: Mon, 9 May 2016 13:09:24 +0200 [thread overview]
Message-ID: <57306FE4.4050006@redhat.com> (raw)
In-Reply-To: <20160428182341-mutt-send-email-mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
On 28/04/2016 17:37, Michael S. Tsirkin wrote:
> > All the internally-emulated devices *can* be either translated or
> > untranslated. That's just a matter of software. Surely, you currently
> > *can't* have translated assigned devices (until someone implements the
> > whole VT-d page table shadowing or whatever), so you'll be barred from
> > assigning a device to a slot which *previously* had an untranslated
> > device. But so what? Put it in a different slot instead.
>
> Unfortunately people got used to be able to put any device
> in any slot, and built external tools around that ability.
> It's rather painful to break this assumption.
Once you move to PCIe, a lot of things become more complicated. This is
just one of them; instead of needing half a dozen PCI bridges, you'll
need half a dozen plus one.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>,
David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>, Kevin Wolf <kwolf@redhat.com>,
Wei Liu <wei.liu2@citrix.com>, Andy Lutomirski <luto@kernel.org>,
qemu-block@nongnu.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
Jason Wang <jasowang@redhat.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
qemu-devel@nongnu.org, peterx@redhat.com,
linux-kernel@vger.kernel.org, Amit Shah <amit.shah@redhat.com>,
iommu@lists.linux-foundation.org,
Stefan Hajnoczi <stefanha@redhat.com>,
kvm@vger.kernel.org, cornelia.huck@de.ibm.com,
virtualization@lists.linux-foundation.org,
Anthony PERARD <anthony.perard@citrix.com>
Subject: Re: [PATCH V2 RFC] fixup! virtio: convert to use DMA api
Date: Mon, 9 May 2016 13:09:24 +0200 [thread overview]
Message-ID: <57306FE4.4050006@redhat.com> (raw)
In-Reply-To: <20160428182341-mutt-send-email-mst@redhat.com>
On 28/04/2016 17:37, Michael S. Tsirkin wrote:
> > All the internally-emulated devices *can* be either translated or
> > untranslated. That's just a matter of software. Surely, you currently
> > *can't* have translated assigned devices (until someone implements the
> > whole VT-d page table shadowing or whatever), so you'll be barred from
> > assigning a device to a slot which *previously* had an untranslated
> > device. But so what? Put it in a different slot instead.
>
> Unfortunately people got used to be able to put any device
> in any slot, and built external tools around that ability.
> It's rather painful to break this assumption.
Once you move to PCIe, a lot of things become more complicated. This is
just one of them; instead of needing half a dozen PCI bridges, you'll
need half a dozen plus one.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>,
David Woodhouse <dwmw2@infradead.org>
Cc: Joerg Roedel <joro@8bytes.org>, Kevin Wolf <kwolf@redhat.com>,
Wei Liu <wei.liu2@citrix.com>, Andy Lutomirski <luto@kernel.org>,
qemu-block@nongnu.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
Jason Wang <jasowang@redhat.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
qemu-devel@nongnu.org, peterx@redhat.com,
linux-kernel@vger.kernel.org, Amit Shah <amit.shah@redhat.com>,
iommu@lists.linux-foundation.org,
Stefan Hajnoczi <stefanha@redhat.com>,
kvm@vger.kernel.org, cornelia.huck@de.ibm.com,
virtualization@lists.linux-foundation.org,
Anthony PERARD <anthony.perard@citrix.com>
Subject: Re: [Qemu-devel] [PATCH V2 RFC] fixup! virtio: convert to use DMA api
Date: Mon, 9 May 2016 13:09:24 +0200 [thread overview]
Message-ID: <57306FE4.4050006@redhat.com> (raw)
In-Reply-To: <20160428182341-mutt-send-email-mst@redhat.com>
On 28/04/2016 17:37, Michael S. Tsirkin wrote:
> > All the internally-emulated devices *can* be either translated or
> > untranslated. That's just a matter of software. Surely, you currently
> > *can't* have translated assigned devices (until someone implements the
> > whole VT-d page table shadowing or whatever), so you'll be barred from
> > assigning a device to a slot which *previously* had an untranslated
> > device. But so what? Put it in a different slot instead.
>
> Unfortunately people got used to be able to put any device
> in any slot, and built external tools around that ability.
> It's rather painful to break this assumption.
Once you move to PCIe, a lot of things become more complicated. This is
just one of them; instead of needing half a dozen PCI bridges, you'll
need half a dozen plus one.
Paolo
next prev parent reply other threads:[~2016-05-09 11:09 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-21 13:43 [PATCH V2 RFC] fixup! virtio: convert to use DMA api Michael S. Tsirkin
2016-04-21 13:43 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-21 13:43 ` Michael S. Tsirkin
2016-04-21 13:54 ` Wei Liu
2016-04-21 13:54 ` Wei Liu
2016-04-21 13:54 ` [Qemu-devel] " Wei Liu
2016-04-21 13:54 ` Wei Liu
2016-04-27 12:18 ` David Woodhouse
2016-04-27 12:18 ` [Qemu-devel] " David Woodhouse
2016-04-27 13:37 ` Michael S. Tsirkin
2016-04-27 13:37 ` [Qemu-devel] " Michael S. Tsirkin
[not found] ` <20160427153345-mutt-send-email-mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-27 14:23 ` Joerg Roedel
2016-04-27 14:23 ` [Qemu-devel] " Joerg Roedel
2016-04-27 14:23 ` Joerg Roedel
2016-04-27 14:31 ` Andy Lutomirski
2016-04-27 14:31 ` [Qemu-devel] " Andy Lutomirski
2016-04-27 14:31 ` Andy Lutomirski
2016-04-27 14:38 ` Michael S. Tsirkin
[not found] ` <CALCETrVkSSJbjoK8i7pLsSYR0o=Wy1UP-mrmn2uxYUd81g18dg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-04-27 14:38 ` Michael S. Tsirkin
2016-04-27 14:38 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-27 14:38 ` Michael S. Tsirkin
2016-04-27 14:43 ` Andy Lutomirski
2016-04-27 14:43 ` [Qemu-devel] " Andy Lutomirski
2016-04-27 14:43 ` Andy Lutomirski
2016-04-27 14:54 ` Michael S. Tsirkin
2016-04-27 14:54 ` Michael S. Tsirkin
2016-04-27 14:54 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-27 14:54 ` Michael S. Tsirkin
2016-04-27 14:58 ` Joerg Roedel
2016-04-27 14:58 ` [Qemu-devel] " Joerg Roedel
2016-04-27 15:09 ` Michael S. Tsirkin
2016-04-27 15:09 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-27 15:09 ` Michael S. Tsirkin
2016-04-27 15:09 ` Michael S. Tsirkin
2016-04-27 14:58 ` Joerg Roedel
2016-04-27 15:10 ` Andy Lutomirski
2016-04-27 15:10 ` Andy Lutomirski
2016-04-27 15:10 ` [Qemu-devel] " Andy Lutomirski
2016-04-27 15:10 ` Andy Lutomirski
2016-04-27 14:43 ` Andy Lutomirski
2016-04-27 14:34 ` Michael S. Tsirkin
2016-04-27 14:34 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-27 14:34 ` Michael S. Tsirkin
2016-04-27 14:56 ` Joerg Roedel
[not found] ` <20160427172630-mutt-send-email-mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-27 14:56 ` Joerg Roedel
2016-04-27 14:56 ` [Qemu-devel] " Joerg Roedel
2016-04-27 14:56 ` Joerg Roedel
2016-04-27 15:05 ` Michael S. Tsirkin
[not found] ` <20160427145632.GI17926-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-04-27 15:05 ` Michael S. Tsirkin
2016-04-27 15:05 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-27 15:05 ` Michael S. Tsirkin
2016-04-27 15:15 ` David Woodhouse
2016-04-27 15:15 ` David Woodhouse
2016-04-27 15:15 ` [Qemu-devel] " David Woodhouse
2016-04-27 15:15 ` David Woodhouse
2016-04-27 18:17 ` Michael S. Tsirkin
2016-04-27 18:17 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-27 18:17 ` Michael S. Tsirkin
2016-04-27 19:16 ` David Woodhouse
2016-04-27 19:16 ` David Woodhouse
2016-04-27 19:16 ` [Qemu-devel] " David Woodhouse
2016-04-27 19:16 ` David Woodhouse
2016-04-28 14:34 ` Michael S. Tsirkin
[not found] ` <1461784617.118304.181.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-28 14:34 ` Michael S. Tsirkin
2016-04-28 14:34 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-28 14:34 ` Michael S. Tsirkin
2016-04-28 15:11 ` David Woodhouse
2016-04-28 15:11 ` [Qemu-devel] " David Woodhouse
2016-04-28 15:11 ` David Woodhouse
[not found] ` <1461856314.33870.98.camel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2016-04-28 15:37 ` Michael S. Tsirkin
2016-04-28 15:37 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-28 15:37 ` Michael S. Tsirkin
2016-04-28 15:48 ` David Woodhouse
2016-04-28 15:48 ` David Woodhouse
2016-04-28 15:48 ` [Qemu-devel] " David Woodhouse
2016-04-28 15:48 ` David Woodhouse
2016-05-01 10:37 ` Michael S. Tsirkin
2016-05-01 10:37 ` [Qemu-devel] " Michael S. Tsirkin
2016-05-01 10:37 ` Michael S. Tsirkin
[not found] ` <20160428182341-mutt-send-email-mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-05-09 11:09 ` Paolo Bonzini [this message]
2016-05-09 11:09 ` [Qemu-devel] " Paolo Bonzini
2016-05-09 11:09 ` Paolo Bonzini
2016-05-09 11:09 ` Paolo Bonzini
2016-04-28 15:37 ` Michael S. Tsirkin
2016-04-27 18:17 ` Michael S. Tsirkin
2016-04-27 14:23 ` Joerg Roedel
2016-04-27 13:37 ` Michael S. Tsirkin
2016-04-27 12:18 ` David Woodhouse
2016-04-21 14:56 ` Stefan Hajnoczi
2016-04-21 14:56 ` Stefan Hajnoczi
2016-04-21 14:56 ` [Qemu-devel] " Stefan Hajnoczi
2016-04-21 15:11 ` Michael S. Tsirkin
2016-04-21 15:11 ` [Qemu-devel] " Michael S. Tsirkin
2016-04-21 15:11 ` Michael S. Tsirkin
2016-04-22 9:33 ` Stefan Hajnoczi
2016-04-22 9:33 ` [Qemu-devel] " Stefan Hajnoczi
2016-04-22 9:33 ` Stefan Hajnoczi
2016-04-22 9:33 ` Stefan Hajnoczi
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