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 05:43:50 +0100 [thread overview]
Message-ID: <20151026044350.GE27420@8bytes.org> (raw)
In-Reply-To: <1445833878.3405.24.camel@infradead.org>
On Mon, Oct 26, 2015 at 01:31:18PM +0900, David Woodhouse wrote:
> On Sun, 2015-10-25 at 19:55 -0700, Andy Lutomirski wrote:
> > but in a way that would actually work on all supported platforms
> > without breaking backward compatibility or killing performance.
>
> FWIW it should be fine with VT-d; we already cope with the concept that
> *some* devices don't have translation, while others do. If we don't
> have DMA translation for the virtio devices, that works out fine.
Yes, that should work with the x86 IOMMUs and also with the DT-based
configuration of most ARM IOMMUs.
But it would actually be neat to have at least the option to translate
virtio DMA through an emulated IOMMU to be able to pass a virtio-device
to a nested guest.
Joerg
next prev parent reply other threads:[~2015-10-26 4:43 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 [this message]
2015-10-26 4:48 ` David Woodhouse
2015-10-26 5:04 ` Joerg Roedel
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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