Re: [PATCH 1/2] kvm/x86: Hyper-V synthetic interrupt controller

On 09/10/2015 17:53, Roman Kagan wrote:

quoted

I really don't like this auto-EOI extension, but I guess that's the
spec. :( If it wasn't for it, you could do everything very easily in
userspace using Google's proposed MSR exit.

I guess you're right.  We'd probably have to (ab)use MSI for SINT
delivery, though.

Not really an issue, as MSI on x86 is really just the external entry
point into the LAPIC, it makes sense that it be the external interface
into KVM's virtualized LAPIC.  Userspace split irqchip is (ab)using MSI
routes the same way.

Anyway the need to implement auto-EOI rules that out.

Yup.  I look forward to reviewing v2!

Paolo