Re: [Xen-devel] [PATCH v10 07/10] xen: remove workaround to inject evtchn_irq on irq enable

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Stefano,

On 08/05/2014 12:26 PM, Stefano Stabellini wrote:
> evtchn_upcall_pending is already set by common code at vcpu creation,
> therefore on ARM we also need to call vgic_vcpu_inject_irq for it.
> Currently we do that from vgic_enable_irqs as a workaround.
> 
> Do this properly by introducing an appropriate arch specific hook:
> arch_evtchn_inject. arch_evtchn_inject is called by map_vcpu_info to
> inject the evtchn irq into the guest. On ARM is implemented by calling
> vgic_vcpu_inject_irq.
> 
> On x86 guests typically don't call VCPUOP_register_vcpu_info on vcpu0,
> therefore avoiding the issue. However theoretically they could call
> VCPUOP_register_vcpu_info on vcpu0 and in that case Xen would need to
> inject the event channel notification into the guest if the guest is
> HVM. So implement arch_evtchn_inject on x86 by calling
> hvm_assert_evtchn_irq.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>

Regards,

-- 
Julien Grall

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