Re: Shared IRQ with PCI Passthrough?

[Michael Sturm <cyclonic2k@yahoo.com.au>]

On 19-08-11 0:02, Gardziejczyk, Kamil wrote:
> Hi,
>
> Have you resolve your problem with shared IRQ lines? I have checked out qemu-kvm 0.15.0 and found that Jan Kiszka patch was applied to latest version of kvm.
>
> [PATCH 0/5] pci-assign: Host IRQ sharing suppport + some fixes and cleanups
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/64601
>
> Which version of linux kernel do you use? I have tried with 3.0.0. It looks that Jan Kiszka`s patches were not added to that kernel version. Maybe it is in 2.6.xxx?
> Any ideas how to fix it? :)
>
>

Hi Kamil,

Thanks for your reply.

For testing purposes, I've installed Ubuntu 11.04 Server (64-bit) on a 
separate physical disk. The default kernel of this setup is 
2.6.38-8-server (slightly newer than the Proxmox kernel 2.6.35-1-pve I 
was using previously).

As you suggested, I too have now tested qemu-kvm 0.15.0. (git clone 
git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git and compiling the 
stable-0.15 branch).

As before, using the nousb kernel option (with intel_iommu=on) my WinXP 
guest with pci-passthrough works fine, but without the nousb option, the 
guest cannot be started.

My next attempt will be to try the KVM external module kit, compiling 
the latest code from the git clone 
git://git.kernel.org/pub/scm/virt/kvm/kvm-kmod.git. I think using the 
module kit rather than patching and compiling a custom kernel should 
work better in my case (if I'm moving back to Proxmox later), yet still 
update KVM to the latest code.

Hopefully this will resolve the IRQ conflict.

Any other ideas?

Mick