linux-kernel - Re: [Xen-devel] [PATCH RFC 0/3] Xen on Virtio

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Message-ID: <566ECB65.3060509@citrix.com>
Date:	Mon, 14 Dec 2015 14:00:05 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<mst@...hat.com>
CC:	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
	<virtualization@...ts.linux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [Xen-devel] [PATCH RFC 0/3] Xen on Virtio

On 07/12/15 16:19, Stefano Stabellini wrote:
> Hi all,
> 
> this patch series introduces support for running Linux on top of Xen
> inside a virtual machine with virtio devices (nested virt scenario).
> The problem is that Linux virtio drivers use virt_to_phys to get the
> guest pseudo-physical addresses to pass to the backend, which doesn't
> work as expected on Xen.
> 
> Switching the virtio drivers to the dma APIs (dma_alloc_coherent,
> dma_map/unmap_single and dma_map/unmap_sg) would solve the problem, as
> Xen support in Linux provides an implementation of the dma API which
> takes care of the additional address conversions. However using the dma
> API would increase the complexity of the non-Xen case too. We would also
> need to keep track of the physical or virtual address in addition to the
> dma address for each vring_desc to be able to free the memory in
> detach_buf (see patch #3).
> 
> Instead this series adds few obvious checks to perform address
> translations in a couple of key places, without changing non-Xen code
> paths. You are welcome to suggest improvements or alternative
> implementations.

Andy Lutomirski also looked at this.  Andy what happened to this work?

David
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