RE: [Xen-devel] [PATCH 00 of 38] xen: add more Xen dom0 support

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

>-----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
>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel