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xen-devel
Re: [Xen-devel] [PATCH 1/2][VTD] pci mmconfig support to be used for ATS
>>> "Kay, Allen M" <allen.m.kay@xxxxxxxxx> 20.11.08 02:42 >>>
>ATS (Address Translation Service) is a PCI specification used for
>synchronizing iotlb translations between chipset iommu such as vt-d with iotlb
>on board a PCI device.
>
>This patch enables PCI mmconfig for Intel64 systems. Most of the code were
>copied from Linux. This functionality is need for parsing ATS capability in
>PCIe extended configuration space.
If this is x86-64 only anyway, why do you need to use fixmap space for this
(and limit things arbitrarily to 4 segments) rather than using a 256Mb block
from one of the unused virtual address regions in hypervisor space?
Also, using obj-$(CONFIG_X86_64) in the Makefile changes would avoid building
dead code for x86-32...
Jan
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