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AMD IOMMU: add parameter to disable device isolation

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Impact: add a new AMD IOMMU kernel command line parameter

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-11-17 15:07:17 +01:00
parent 4e14e833ac
commit e5e1f606ec
2 changed files with 4 additions and 0 deletions
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2
Documentation/kernel-parameters.txt
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@ -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

2
arch/x86/kernel/amd_iommu_init.c
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@ -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;
}