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Re: [Xen-devel] [PATCH v11 05/10] xen/arm: physical irq follow virtual irq

Hi Stefano,

On 08/08/2014 06:13 PM, Stefano Stabellini wrote:
> Migrate physical irqs to the same physical cpu that is running the vcpu
> expected to receive the irqs. That is done when enabling irqs, when the
> guest writes to GICD_ITARGETSR and when Xen migrates a vcpu to a
> different pcpu.
> In case of virq migration, if the virq is inflight and in a GICH_LR
> register already, delay migrating the corresponding physical irq until
> the virq is EOIed by the guest and the MIGRATING flag has been cleared.
> This way we make sure that the pcpu running the old vcpu gets
> interrupted with a new irq of the same kind, clearing the GICH_LR sooner.
> Introduce a new arch specific function, arch_move_irqs, that is empty on
> x86 and implements the vgic irq migration code on ARM.
> arch_move_irqs is going to be called by from sched.c.
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>


Julien Grall

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