Re: [Xen-devel] [PATCH] AMD IOMMU: also allocate IRTEs for HPET MSI

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.08.13 at 03:21, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> 
>>> wrote:
> I have been trying to test out this patch.  Somehow, I could not get Xen 
> boot option to exercise the code path.  What boot configuration are you 
> using to test this?

I don't have a system suitable for testing this; Sander did. The main
requirement apart from having an IOMMU is to also have a HPET
with at least on MSI-capable channel. Otherwise code won't get
here. The normal flow is 

hpet_broadcast_init() -> hpet_fsb_cap_lookup() -> hpet_assign_irq()
-> hpet_setup_msi_irq() -> iommu_setup_hpet_msi()

Jan


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