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| author | Alex Williamson <alex.williamson@redhat.com> | 2011-10-21 23:56:24 +0400 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2011-11-15 15:22:31 +0400 |
| commit | bcb71abe7d4c5a0d0368c67da0a7def4fc73497a (patch) | |
| tree | 3a043f872b234cb5c47cec1c01b4bbb69539fa0f /arch/x86/kernel/pci-dma.c | |
| parent | 8fbdce659549d93dfb257ec4eabacf63a188e506 (diff) | |
| download | linux-bcb71abe7d4c5a0d0368c67da0a7def4fc73497a.tar.xz | |
iommu: Add option to group multi-function devices
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>
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 80dc793b3f63..1c4d769e21ea 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -45,6 +45,15 @@ int iommu_detected __read_mostly = 0; */ int iommu_pass_through __read_mostly; +/* + * Group multi-function PCI devices into a single device-group for the + * iommu_device_group interface. This tells the iommu driver to pretend + * it cannot distinguish between functions of a device, exposing only one + * group for the device. Useful for disallowing use of individual PCI + * functions from userspace drivers. + */ +int iommu_group_mf __read_mostly; + extern struct iommu_table_entry __iommu_table[], __iommu_table_end[]; /* Dummy device used for NULL arguments (normally ISA). */ @@ -169,6 +178,8 @@ static __init int iommu_setup(char *p) #endif if (!strncmp(p, "pt", 2)) iommu_pass_through = 1; + if (!strncmp(p, "group_mf", 8)) + iommu_group_mf = 1; gart_parse_options(p); |