Re: [Xen-devel] [PATCH v6 2/5] xen/arm: inflight irqs during migration

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-06-23 at 17:37 +0100, Stefano Stabellini wrote:

> +        list_del_init(&p->lr_queue);
> +        list_del_init(&p->inflight);
> +        spin_unlock_irqrestore(&old->arch.vgic.lock, flags);
> +        vgic_vcpu_inject_irq(new, irq);
> +        return;
> +    /* if the IRQ is in a GICH_LR register, set GIC_IRQ_GUEST_MIGRATING
> +     * and wait for the EOI */

Is it safe that MIGRATING serves dual purpose -- it indicates an irq
which is actively being moved but it also indicates an irq where we are
awaiting an EOI before migrating it. (Or have I misunderstood what is
going on here?)

I suspect what I'm worried about is something completing the migration
without realising it needs to wait for an EOI?

Ian.


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