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Re: [Qemu-devel] [PATCH] VirtIO Support for Memory Regions

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH] VirtIO Support for Memory Regions
Date: Wed, 24 Feb 2010 09:41:17 -0600
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On 02/24/2010 09:13 AM, Anthony Liguori wrote:
to work on that if we can agree on what the underlying device looks
like whether it should be VirtIO or just PCI.
Agreed, you had suggested uio_pci for my PCI driver and I'd be happy

I feel pretty strongly that we shouldn't add shared memory to virtio. I'm pretty sure Christian would too because it eliminates the possibility of implementing a copy-based transport for virtio (virtio-over-ethernet).

Actually, ignore my crazy justification based on virtio-over-ethernet :-)

Certain hypervisors (like Xen and PHYP) have very limited/non-existent support for shared memory. In the case of Xen, there's a very small pool that can be used for DMA buffers. In the case of PHYP, you have hardware accelerated copying for all I/O.

Adding shared memory to virtio means that virtio could not be supported (or at least, all virtio devices) on these hypervisors.


Anthony Liguori

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