Re: [Qemu-devel] should KVM or userspace be the one which decides what MIPIDR/affinity values to assign to vcpus?

[Igor Mammedov]

On Tue, 09 Jun 2015 15:35:21 +0100
Marc Zyngier <address@hidden> wrote:

> On 09/06/15 15:01, Peter Maydell wrote:
> > On 9 June 2015 at 15:00, Marc Zyngier <address@hidden> wrote:
> >>
> >> Yeah, what I had in mind was something along the lines of:
> >> - kernel computes its "default MPDIR"
> >> - kernel exposes a new capability "KVM_ARM_ALLOW_MPIDR_OVERRIDE" (or
> >> something along those lines)
> >> - userspace does the right thing.
> > 
> > You forgot the "???" step :-)
> 
> Indeed. I also missed the step that says "kernel is able to convert
> arbitrary MPIDR to vcpu_id in an efficient manner...". GICv3 is
> definitely going to require this.
x86 probably already has code that does this for APIC ID -> vcpu_id