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Re: [Qemu-devel] [Xen-devel] [PATCH RFC V1 00/11] Xen PCI Passthrough

To: Avi Kivity <avi@xxxxxxxxxx>
Subject: Re: [Qemu-devel] [Xen-devel] [PATCH RFC V1 00/11] Xen PCI Passthrough
From: Anthony Liguori <anthony@xxxxxxxxxxxxx>
Date: Tue, 04 Oct 2011 10:01:16 -0500
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, QEMU-devel <qemu-devel@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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On 10/04/2011 09:58 AM, Avi Kivity wrote:
On 10/04/2011 04:51 PM, Anthony PERARD wrote:
Hi all,

This patch series introduce the PCI passthrough for Xen.

First, we have HostPCIDevice that help to access one PCI device of the host.

Then, there are several additions in the QEMU code. One is qemu_run_one_timer
to run a specific timer. It is used by PCI passthrough to run a timer about
power management. Another is pci_check_bar_overlap.

There are also several change in pci_ids and pci_regs.

Last part, but not least, the PCI passthrough device himself. Cut in 3 parts
(or file), there is one to take care of the initialisation of a passthrough
device. The second one handle everything about the config address space, there
are specifics functions for every config register. The third one is to handle
MSI.

I'm still working on setting a PCI passthrough device through QMP from libxl
(xen tool stack). It is just a call to device_add, with the driver parametter
hostaddr="0000:00:1b.0".

There is some minor things missing:
- copyright header
- PCI IO space multiplexer



We also have pci passthrough in qemu-kvm (I think based on the same Neocleus
code). Rather than having two pci assignment implementations, I think we should
have just one, with the differences (programming the hypervisor) abstracted at
that level.

I agree in principle but how close is qemu-kvm pci passthrough to a mergable state? Would it make sense to merge the Xen code first and then abstract it?

Regards,

Anthony Liguori




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