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AMD IOMMU: enable device isolation per default

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Impact: makes device isolation the default for AMD IOMMU

Some device drivers showed double-free bugs of DMA memory while testing
them with AMD IOMMU. If all devices share the same protection domain
this can lead to data corruption and data loss. Prevent this by putting
each device into its own protection domain per default.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-11-17 15:09:20 +01:00
parent e5e1f606ec
commit 3ce1f93c6d
2 changed files with 2 additions and 2 deletions
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2
Documentation/kernel-parameters.txt
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@ -294,7 +294,7 @@ and is between 256 and 4096 characters. It is defined in the file
Possible values are:
isolate - enable device isolation (each device, as far
as possible, will get its own protection
domain)
domain) [default]
share - put every device behind one IOMMU into the
same protection domain
fullflush - enable flushing of IO/TLB entries when

2
arch/x86/kernel/amd_iommu_init.c
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@ -121,7 +121,7 @@ u16 amd_iommu_last_bdf; /* largest PCI device id we have
LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings
we find in ACPI */
unsigned amd_iommu_aperture_order = 26; /* size of aperture in power of 2 */
int amd_iommu_isolate; /* if 1, device isolation is enabled */
int amd_iommu_isolate = 1; /* if 1, device isolation is enabled */
bool amd_iommu_unmap_flush; /* if true, flush on every unmap */
LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the