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