Re: [Qemu-devel] [PATCH] MSI / MSIX injection for Xen HVM

[Paolo Bonzini]

Il 01/03/2012 15:06, Stefano Stabellini ha scritto:
>> > This is not a NACK, but I can't help asking.  Perhaps the fake Xen
>> > interrupt controller is a bit too simplistic?  You can add a memory
>> > region corresponding to the APICs and trap writes in that region.
>> > Writes coming from QEMU are MSIs and can be injected to the hypervisor,
>> > writes coming from the VM will be trapped by Xen before going out to QEMU.
>  
> That is a good point actually: we already have lapic emulation in Xen,
> it makes sense to have apic-msi in Xen too.
> We would still need the changes to msi_notify and msix_notify though.

Why?  The stores would just go to the Xen interrupt controller MMIO area
which then does the xc_hvm_inject_msi.

Paolo