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Re: [Qemu-devel] [PATCH 4/5] vfio: Move container list to DMAContext


From: Alexey Kardashevskiy
Subject: Re: [Qemu-devel] [PATCH 4/5] vfio: Move container list to DMAContext
Date: Fri, 26 Apr 2013 18:46:27 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130402 Thunderbird/17.0.5

On 04/26/2013 06:44 PM, Paolo Bonzini wrote:

Il 25/04/2013 08:36, David Gibson ha scritto:
On Wed, Apr 24, 2013 at 06:33:33PM +0200, Paolo Bonzini wrote:
Il 24/04/2013 17:12, Alex Williamson ha scritto:
At the moment, vfio maintains a global list of containers
that are assumed to be more or less interchangeable, since
they are all set up with a MemoryListener to have all of
system memory mapped.  However, that only makes sense if
all the containers are used on devices which really do
expect a dma address space identical to system memory.

This patch moves towards that by making the list of
containers per DMAContext (which corresponds to a dma
address space) instead of global.
This seems like an unnecessary intrusion into common code.  Why
not create a vfio specific list of dma objects, each with a
list of containers?  Thanks,

Yeah, I suggest that this is re-evaluated on top of the iommu
patches.

You can find them at git://github.com/bonzini/qemu.git, branch
iommu. It seems to work with pseries, at least my guest crashes
at the same place with and without.  USB works, and so do VGA and
spapr-vscsi.

Ok, I'll have a look when I get a chance.  Any guesses as to when
they might reach mainline?

If I get your Tested-by, early in 1.6.


Emulated PCI works on ppc64/spapr so far.



--
Alexey



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