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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-11-17 15:07:17 +0100 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2008-11-18 15:43:23 +0100 |
| commit | e5e1f606ecbf67e52ebe2df5d14f8b94ec6544d0 (patch) | |
| tree | 07ca4cda790e3937f0893b41b3777ce6492ef9f4 | |
| parent | 4e14e833ac3b97a4aa8803eea49f899adc5bb5f4 (diff) | |
AMD IOMMU: add parameter to disable device isolation
Impact: add a new AMD IOMMU kernel command line parameter
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 9fa6508892c..b56ee02d251 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -295,6 +295,8 @@ and is between 256 and 4096 characters. It is defined in the file isolate - enable device isolation (each device, as far as possible, will get its own protection domain) + share - put every device behind one IOMMU into the + same protection domain fullflush - enable flushing of IO/TLB entries when they are unmapped. Otherwise they are flushed before they will be reused, which diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index 0cdcda35a05..838a2e1d5bb 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -1213,6 +1213,8 @@ static int __init parse_amd_iommu_options(char *str) for (; *str; ++str) { if (strncmp(str, "isolate", 7) == 0) amd_iommu_isolate = 1; + if (strncmp(str, "share", 5) == 0) + amd_iommu_isolate = 0; if (strncmp(str, "fullflush", 11) == 0) amd_iommu_unmap_flush = true; } |