Re: [Xen-devel] [Query] Flow of PCI device dedicated to a domU

[Simon Martin <furryfuttock@xxxxxxxxx>]

Hello Ian,

>> If I read this correctly you are saying that the MMIO region is
>> already mapped into my domain by xl? So when I go and read the BAR
>> register from the PCI configuration I can just go and access it
>> directly or do I have to update the VA mapping?

> Stefano meant mapped in the p2m which under ARM or x86 HVM still means
> you need to make a virtual mapping of those PFNs.

> Under X86 PV "mapping" in this context really just means giving
> permission to map the underlying MFNs, so you still need to create a
> virtual mapping but they don't exist in your p2m until you put them
> there.

Thanks Ian, that is what I had understood from the mail that you sent
me on the thread I started about "Consuming PCI device in PV kernel".
Just wanted to confirm. I have just about worked my way up to
implementing the MMIO access now and wanted to make sure before I
carry on.

-- 
Best regards,
 Simon                            mailto:furryfuttock@xxxxxxxxx


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