From: Joerg Roedel <joro@8bytes.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
m.smarduch@samsung.com,
"ksummit-discuss@lists.linuxfoundation.org"
<ksummit-discuss@lists.linuxfoundation.org>
Subject: Re: [Ksummit-discuss] Short topic: virtio vs IOMMU
Date: Mon, 26 Oct 2015 06:04:50 +0100 [thread overview]
Message-ID: <20151026050450.GF27420@8bytes.org> (raw)
In-Reply-To: <1445834882.3405.30.camel@infradead.org>
On Mon, Oct 26, 2015 at 01:48:02PM +0900, David Woodhouse wrote:
> It would be useful to have an emulated IOMMU, full stop. And yeah, it
> might actually make sense to *start* by using it for purely virtual
> devices, [...]
Sure, I think this is what qemu provides already, except for the virtio
devices (which are also emulated). I think it would be cool to have
virtio translated by the emulated iommu too (at least optional).
> [...] and then graduate to doing it for passthrough (which will
> finally mean we can stop having to pin *all* guest memory the moment we
> assign a device, and we only have to pin those pages which are
> referenced from the IOMMU page tables).
Good point, havn't thought of that yet. But getting rid of the excessive
pinning this way would be really great.
Joerg
next prev parent reply other threads:[~2015-10-26 5:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-26 2:55 Andy Lutomirski
2015-10-26 4:31 ` David Woodhouse
2015-10-26 4:43 ` Joerg Roedel
2015-10-26 4:48 ` David Woodhouse
2015-10-26 5:04 ` Joerg Roedel [this message]
2015-10-26 5:13 ` David Woodhouse
2015-10-26 5:20 ` Joerg Roedel
2015-10-26 6:03 ` Andy Lutomirski
2015-10-26 4:38 ` Joerg Roedel
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