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Commit 3ce1f93c authored by Joerg Roedel's avatar Joerg Roedel
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AMD IOMMU: enable device isolation per default 



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: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent e5e1f606

Documentation/kernel-parameters.txt

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/x86/kernel/amd_iommu_init.c

+1 −1
Original line number Diff line number Diff line
@@ -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