[Xen-devel] Re: [PATCH][RFC] Support S3 for MSI interrupt in latest kernel dom0

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 17/12/2008 14:47, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> Could Xen remember the MSI state automatically, as it does for IO-APIC
>> presumably already? It knows what vectors are routed where at least, even if
>> dom0 has to reprogram the PCI device itself.
> 
> That is what the map_guest_pirq() re-invocation is intended for - use the
> already known (stored) MSI state to re-setup the device accordingly
> (after all, msi_compose_msg() only depends on the vector information
> to be able to reconstruct address and data fields).

Why wait for map_guest_pirq() to be invoked to do this?

 -- Keir



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