From: David Woodhouse <dwmw2@infradead.org>
To: "Michael S. Tsirkin" <mst@redhat.com>,
Andy Lutomirski <luto@amacapital.net>
Cc: Wei Liu <wei.liu2@citrix.com>, Andy Lutomirski <luto@kernel.org>,
qemu-block@nongnu.org,
Christian Borntraeger <borntraeger@de.ibm.com>,
"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>,
peterx@redhat.com,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Amit Shah <amit.shah@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
kvm list <kvm@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Linux Virtualization <virtualization@lists.linux-foundation.org>
Subject: Re: [PATCH RFC] fixup! virtio: convert to use DMA api
Date: Tue, 19 Apr 2016 12:26:44 -0400 [thread overview]
Message-ID: <1461083204.20056.8.camel@infradead.org> (raw)
In-Reply-To: <20160419191914-mutt-send-email-mst@redhat.com>
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On Tue, 2016-04-19 at 19:20 +0300, Michael S. Tsirkin wrote:
>
> > I thought that PLATFORM served that purpose. Woudn't the host
> > advertise PLATFORM support and, if the guest doesn't ack it, the host
> > device would skip translation? Or is that problematic for vfio?
>
> Exactly that's problematic for security.
> You can't allow guest driver to decide whether device skips security.
Right. Because fundamentally, this *isn't* a property of the endpoint
device, and doesn't live in virtio itself.
It's a property of the platform IOMMU, and lives there.
--
dwmw2
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next prev parent reply other threads:[~2016-04-19 16:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1460979793-6621-1-git-send-email-mst@redhat.com>
2016-04-18 11:58 ` [PATCH RFC] fixup! virtio: convert to use DMA api David Woodhouse
[not found] ` <1460980717.12793.43.camel@infradead.org>
2016-04-18 13:12 ` Michael S. Tsirkin
[not found] ` <20160418160731-mutt-send-email-mst@redhat.com>
2016-04-18 14:03 ` David Woodhouse
[not found] ` <1460988232.22654.7.camel@infradead.org>
2016-04-18 14:23 ` Michael S. Tsirkin
2016-04-18 15:22 ` David Woodhouse
2016-04-18 15:30 ` Michael S. Tsirkin
2016-04-18 15:51 ` David Woodhouse
2016-04-18 16:27 ` Michael S. Tsirkin
2016-04-18 18:29 ` David Woodhouse
2016-04-18 19:24 ` Andy Lutomirski
2016-04-19 10:27 ` Michael S. Tsirkin
2016-04-19 16:02 ` Andy Lutomirski
[not found] ` <CALCETrX72XV25B-0GdaMyJNkJRvvC8MbT4G=L5oGR=D5stpG6w@mail.gmail.com>
2016-04-19 16:09 ` Michael S. Tsirkin
[not found] ` <20160419190520-mutt-send-email-mst@redhat.com>
2016-04-19 16:12 ` Andy Lutomirski
2016-04-19 16:20 ` Michael S. Tsirkin
2016-04-19 16:26 ` David Woodhouse [this message]
2016-04-19 17:49 ` Michael S. Tsirkin
[not found] ` <20160419204907-mutt-send-email-mst@redhat.com>
2016-04-19 18:01 ` Andy Lutomirski
[not found] ` <CALCETrXsbYj5c3j2em2-jrhBWp-VqRJd900s5WDdVUMCN2aiNg@mail.gmail.com>
2016-04-19 20:16 ` Michael S. Tsirkin
[not found] ` <20160419231437-mutt-send-email-mst@redhat.com>
2016-04-19 20:27 ` Andy Lutomirski
[not found] ` <CALCETrXqrbwvStj9MhKizceze56SAFH_hUJwsQ83NsSRzWiq8Q@mail.gmail.com>
2016-04-19 20:54 ` Michael S. Tsirkin
[not found] ` <20160419235212-mutt-send-email-mst@redhat.com>
2016-04-19 21:07 ` Andy Lutomirski
[not found] ` <CALCETrUif0iAFWFsz-i848yUO9WrXZ7q+Kx3-4wu-dQRiuCweg@mail.gmail.com>
2016-04-20 13:14 ` Michael S. Tsirkin
2016-04-20 15:43 ` Andy Lutomirski
2016-04-19 9:13 ` Michael S. Tsirkin
2016-04-19 14:44 ` Alex Williamson
2016-04-19 16:00 ` Andy Lutomirski
[not found] ` <CALCETrVBo-XBD53eStOCwJd53F7_VTnrMJ9rY7_cXwnt2Z6AOw@mail.gmail.com>
2016-04-19 16:04 ` Michael S. Tsirkin
2016-04-18 11:47 Michael S. Tsirkin
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