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iommu: Add option to group multi-function devices

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The option iommu=group_mf indicates the that the iommu driver should
expose all functions of a multi-function PCI device as the same
iommu_device_group.  This is useful for disallowing individual functions
being exposed as independent devices to userspace as there are often
hidden dependencies.  Virtual functions are not affected by this option.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Alex Williamson
2011-10-21 15:56:24 -04:00
committed by Joerg Roedel
parent 8fbdce6595
commit bcb71abe7d
7 changed files with 30 additions and 2 deletions
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arch/ia64/kernel/pci-dma.c
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@@ -33,6 +33,7 @@ int force_iommu __read_mostly;
#endif
int iommu_pass_through;
int iommu_group_mf;
/* Dummy device used for NULL arguments (normally ISA). Better would
be probably a smaller DMA mask, but this is bug-to-bug compatible