Re: [Xen-devel] [PATCH for-4.6 0/5] xen: arm: Parse PCI DT nodes' ranges and interrupt-map

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.02.15 at 21:13, <suravee.suthikulpanit@xxxxxxx> wrote:
> On 2/18/2015 6:48 AM, Julien Grall wrote:
>> Wouldn't it be possible to route the SPI dynamically when the domain
>> decide to use the MSI n? We would need to implement PHYSDEVOP_map_pirq
>> for MSI.
> 
> Enabling MSI is done by each end-point PCI device drivers in the guest. 
> In Linux, this would mean that when the driver tries to allocate an MSI 
> interrupt, it would need to communicate back to Xen (possibly via 
> hypercall as you pointed out) to get the next available SPI. It is not 
> necessary for now. I am planning to revisit this when we try to 
> implement pass-through support. Lemme know if you think this should be 
> handled differently.

I think guest MSI setup should work at least similarly (if identically
is not possible) to x86, i.e. via the vpci interface.

Jan


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