Re: [Qemu-devel] ARM CPU affinities

[Andrew Jones]

On Mon, Sep 28, 2015 at 06:36:29PM +0300, Pavel Fedin wrote:
>  Hello!
> 
> > I think we'll need to cache mpidr in the vcpu data in order to properly
> > reset it.
> 
>  We already have it in our data. I took a quick look at that, but kernel 
> needs patching. IIRC reset

Right. I was referring to the kernel's vcpu data (struct kvm_vcpu).

> for secondary vCPUs happens inside kernel's PSCI code, before primary tells 
> it to start up. You
> cannot separate these two events.
>  In a short: you can use KVM_SET_ONE_REG for the MPIDR, and the value will go 
> into kernel, but as
> soon as you call KVM_VCPU_RUN for the secondary, it gets reset.

My current thinking is that we'll set MPIDR with KVM_SET_ONE_REG, which
will also set the cached value in struct kvm_vcpu. Reset will then use
that value.

Thanks,
drew