Re: [Xen-devel] [PATCH] x86: properly handle MSI-X unmask operation from guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.11.13 at 17:16, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> wrote:
>>  -----Original Message-----
>> From: xen-devel-bounces@xxxxxxxxxxxxx 
>> [mailto:xen-devel-bounces@xxxxxxxxxxxxx] On Behalf Of Jan Beulich
>> But I this should be done entirely inside the hypervisor - after all
>> it is the hypervisor that forwards the request to qemu, so upon
>> completion of the request it could as well do the necessary
>> unmasking (as long as it doesn't need the interrupt masked for
>> internal purposes).
> 
> Currently, Feng's patch handles the unmask operation when QEMU issues the 
> MSI-X update hypercall (XEN_DOMCTL_bind_pt_irq).
> However, if add the unmask operation in Xen's generic I/O emulation code 
> path, we may need to introduce a new MSI-X specific callback function, which 
> is supposed to be executed after QEMU I/O operation is done. Is this what you 
> mean?

Yes.

Jan


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