Re: [qemu-s390x] [PATCH v1 0/5][RFC] Refactoring of AIS support

[Cornelia Huck]

On Mon, 30 Oct 2017 09:28:09 +0100
Christian Borntraeger <address@hidden> wrote:

> Now I thought about that for a while and I start to think that we cannot 
> implement ais
> in QEMU and cover all cases.
> One aspect was certainly passthrough (like you handled in patch 4).
> Another aspect is that some interrupts might be injected from the kernel - 
> even for
> emulated devices. e.g. virtio-pci together with vhost-net, will inject 
> interrupts via
> the set_irq callback. I think disabling irqfd for these cases is not a good 
> idea.

Is there still a fallback for irqfd emulation?

> 
> So what about adding a new KVM capability (for 4.14), fixup the other things 
> in
> QEMU and then bind it to the new capability?

For 4.15, surely?

Probably the only way we can make this work correctly...