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Commit e5e1f606 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add parameter to disable device isolation 



Impact: add a new AMD IOMMU kernel command line parameter

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 4e14e833

Documentation/kernel-parameters.txt

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/x86/kernel/amd_iommu_init.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

	}