Re: [Xen-devel] Re: [PATCH 0/5] Add MSI support to xen environment

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26/10/07 16:02, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

>> dom0 needs to be involved, since we can't let domU map any arbitrary
> vector
>> into its pirq space. Since dom0 has to be involved in access control
> to the
>> irq vector space, can't it do the mapping?
> 
> yes, what I mean is, "before starting the domain" works for IOAPIC IRQ,
> not MSI. MSI will still through communcation between PCI
> frontend/backend directly.

Oh, I see. Then it probably has to be a phydevop and let dom0 kernel do it.
But there should be no reason to let domU use the map_irq physdev_op at all.

 -- Keir



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