Re: [RFC PATCH] xen/dm: arm: Introudce arm_inject_msi DM op

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 19 Dec 2023, Julien Grall wrote:
> Hi,
> 
> On 19/12/2023 14:18, Mykyta Poturai wrote:
> > Following up with relevant QEMU patch link.
> > 
> > https://patchwork.kernel.org/project/qemu-devel/patch/c7a180a5874f036c246fc39f921eefafecbc8c76.1702994649.git.mykyta_poturai@xxxxxxxx/
> 
> I don't seem to have the patch in my inbox. I guess you didn't CC xen-devel?
> 
> Anyway, I will reply here. I think this is a mistake for QEMU to assume that
> Xen will expose a GICv3 ITS to the guest (we may decide to implement another
> MSI controller).
> 
> But QEMU should really not need to implement a full ITS. What it needs is a
> way to forward the MSI to Xen. That's it.

I fully agree with Julien


> Stefano, do you have any suggestion how to do this in QEMU?

Yes, we just need something like hw/i386/xen/xen_apic.c but for ARM