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

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

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
> 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?

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.

> 
> -- Keir
> 
> 
> 
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