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xen-devel
Re: [Xen-devel] [PATCH 00 of 38] xen: add more Xen dom0 support
Jiang, Yunhong wrote:
> We are working on the MSI support now. I'd get some guide on how the pirq is
> defined in pv dom0, can I assume it is something like xen interrupt
> controller's gsi?
The pirq we pass to Xen is the Linux irq we allocate for the interrupt
source. For compatibility with native, we maintain an irq == gsi
identity, so the Xen pirq will also equal the gsi. However, there's no
problem in allocating irqs above the highest gsi for msi use; you could
either adapt xen_allocate_pirq or add an msi variant. I think the first
is preferred if possible; you'd just use "gsi" to refer to msis too, if
they have easily distinguished identifiers.
Are you thinking of putting a Xen hook in setup_msi_irq?
Thanks,
J
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