[Xen-devel] Re: [PATCH][RFC] Support S3 for MSI interrupt in latest kernel dom0

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 17.12.08 16:22 >>>
>Well, maybe it's okay then. I don't think Yunhong's patch was a good
>argument for it -- looking again it appears to have plenty of not really
>related chunks contained in it.

I don't think it's really okay as-is: As he indicated, there may be side
effects of the changes during other than resume from S3 (in particular
the IRQ_GUEST check around the newly added call to ->startup()), and
I was hoping you might have a suggestion on how to better distinguish
that particular case. In the worst case, Xen has to set another flag in
each MSI irq_desc when it resumes from S3, and do the startup as well
as the clearing of the flag when map_domain_pirq runs first for that
particular vector.

Jan


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