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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26/10/07 15:35, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> wrote:

> For pciback to poke irq configuration, I think for IOAPIC irq is done
> already, we only need add the mapping at that time. For MSI , domain U
> will do that dynamically, so not sure if viable, especially considering
> for MSI-x, only driver knows how many entry will be used.

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?

 -- Keir



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