Re: [Xen-devel] [PATCH v3 01/11] x86/domctl: Add XEN_DOMCTL_set_avail_vcpus

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 11/22/2016 05:39 AM, Jan Beulich wrote:
> > > > On 22.11.16 at 11:31, <JBeulich@xxxxxxxx> wrote:
> > > > > On 21.11.16 at 22:00, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > > This domctl is called when a VCPU is hot-(un)plugged to a guest (via
> > > 'xl vcpu-set').
> > >
> > > The primary reason for adding this call is because for PVH guests
> > > the hypervisor needs to send an SCI and set GPE registers. This is
> > > unlike HVM guests that have qemu to perform these tasks.
> > And the tool stack can't do this?
> For the avoidance of further misunderstandings: Of course likely
> not completely on its own, but by using a (to be introduced) more
> low level hypervisor interface (setting arbitrary GPE bits, with SCI
> raised as needed, or the SCI raising being another hypercall).
So you are suggesting breaking up XEN_DOMCTL_set_avail_vcpus into

XEN_DOMCTL_set_acpi_reg(io_offset, length, val)
XEN_DOMCTL_set_avail_vcpus(avail_vcpus_bitmap)
XEN_DOMCTL_send_virq(virq)

(with perhaps set_avail_vcpus folded into set_acpi_reg) ?


-boris

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