Re: [Xen-devel] Question about the XEN platform pci

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

Please don't top post.

On Tue, Apr 12, 2016 at 05:33:47PM +0200, karim.allah.ahmed@xxxxxxxxx wrote:
> The INTx interrupt of this platform device can be used by Xen in HVM case to
> notify the guest of pending events in the event channel. However that's 
> usually
> not used in favor of vector callbacks support in Xen where a vector is 
> injected
> directly to the vCPU bypassing LAPIC.
> 
> (that said, the platform-pci driver in linux is actually broken when vector
> callbacks are not used anyway)
> 
> I also think that the grant-table lives on this PCI device MMIO BAR (?!)

Not really, grant table can live anywhere, but it's usually placed there 
because the OS knows there's nothing in this MMIO region.
 
Roger.

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