Re: FW: Notification from Qemu to Guest

[Avi Kivity <avi@redhat.com>]

Kumar, Venkat wrote:
> Hi Avi - Probably you can answer this question?
>
>   

I'm no virtio expert; copying someone who is.

>
> I have emulated a PCI device on Qemu and hooked my sample/simple driver to that virtio device on the guest.
>
> I am testing the notification from Guest-Qemu and vice-versa.
>
> I am able to notify from Guest to Qemu but Qemu-Guest notification is not happening.
>
> As a part of "Kick" routine in my guest driver I could see the notification happening from Guest-Qemu and In the Qemu process as a part of handle output for the emulated device I am simply doing  "virtio_notify(vdev, vq)" but I don't see my callback getting called which is already registered as a part of "find_vq" in guest driver's probe.
>   

You need to enable notifications, not sure how exactly.


> BTW, the emulated device is allocated with "GSI 11" where as for other emulated devices like "virtio-blk" is associated with GSI 10 which I found in "dmesg's". Is this a reason why interrupt is not delivered from Qemu-Guest?
>   

Interrupts for PCI devices are assigned based on the slots where they 
sit. Both GSI 10 and GSI 11 are PCI link interrupts.


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