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xen-devel
RE: [Xen-devel] [PATCH 00 of 38] xen: add more Xen dom0 support
>-----Original Message-----
>From: Jeremy Fitzhardinge [mailto:jeremy@xxxxxxxx]
>Sent: 2009年3月24日 0:28
>To: Jiang, Yunhong
>Cc: Xen-devel
>Subject: 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.
I think both should be ok for dom0. Should the driver domain support be
considered also now?
>
>Are you thinking of putting a Xen hook in setup_msi_irq?
Yes, exactly, I assume it is acceptable for changes under arch/x86/kernel/,
like what changes for IOAPIC, am I right?
Thanks
Yunhong Jiang
>
>Thanks,
>J
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