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Re: [Qemu-devel] Virtio-pci issue

From: Evgeny Voevodin
Subject: Re: [Qemu-devel] Virtio-pci issue
Date: Tue, 29 May 2012 07:48:02 +0400
User-agent: Mozilla/5.0 (X11; Linux i686; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 28.05.2012 16:37, Stefan Hajnoczi wrote:
On Thu, May 24, 2012 at 4:18 AM, Evgeny Voevodin<address@hidden>  wrote:
And also there is another problem that I've faced with. It is the ability to
plug as many pci back-ends as board wants.
I mean that if for each back-end board should create a transport, then user
have to know maximum number of transport instances
created by board. In the case of mmio transport I think that it's a correct
behaviour, but for pci transport seems not.
Not sure I understand the problem.  Can you rephrase it?


Ok, I'll try )
As I see, to connect a pci device to board it should be enough to specify "-device ..." on command line. And in the way virtio refactoring is moving, board should create transport pci device to correspond each
back-end created by "-device ..." command.
So, if we create more back-ends with "-device" option then transports created by board then there would be
back-ends that will not have corresponding transport device.
As result user should know maximum number of transport instances created by board to not overrun it. In the case of mmio I think it's normal, but not in the pci case. Am I right?

Kind regards,
Evgeny Voevodin,
Leading Software Engineer,
ASWG, Moscow R&D center, Samsung Electronics
e-mail: address@hidden

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