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IOMMU Fix for Linux v5.0-rc5:

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* Intel decided to leave the newly added Scalable Mode Feature
 	  default-disabled for now. The patch here accomplishes that.
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Merge tag 'iommu-fixes-v5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU fix from Joerg Roedel:
 "Intel decided to leave the newly added Scalable Mode Feature
  default-disabled for now. The patch here accomplishes that"

* tag 'iommu-fixes-v5.0-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Leave scalable mode default off
This commit is contained in:
Linus Torvalds 2019-02-08 15:34:10 -08:00
commit 2e277fa089
2 changed files with 7 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/admin-guide/kernel-parameters.txt
View File

@ -1696,12 +1696,11 @@
By default, super page will be supported if Intel IOMMU
has the capability. With this option, super page will
not be supported.
sm_off [Default Off]
By default, scalable mode will be supported if the
sm_on [Default Off]
By default, scalable mode will be disabled even if the
hardware advertises that it has support for the scalable
mode translation. With this option set, scalable mode
will not be used even on hardware which claims to support
it.
will be used on hardware which claims to support it.
tboot_noforce [Default Off]
Do not force the Intel IOMMU enabled under tboot.
By default, tboot will force Intel IOMMU on, which

8
drivers/iommu/intel-iommu.c
View File

@ -363,7 +363,7 @@ static int dmar_map_gfx = 1;
static int dmar_forcedac;
static int intel_iommu_strict;
static int intel_iommu_superpage = 1;
static int intel_iommu_sm = 1;
static int intel_iommu_sm;
static int iommu_identity_mapping;
#define IDENTMAP_ALL 1
@ -456,9 +456,9 @@ static int __init intel_iommu_setup(char *str)
} else if (!strncmp(str, "sp_off", 6)) {
pr_info("Disable supported super page\n");
intel_iommu_superpage = 0;
} else if (!strncmp(str, "sm_off", 6)) {
pr_info("Intel-IOMMU: disable scalable mode support\n");
intel_iommu_sm = 0;
} else if (!strncmp(str, "sm_on", 5)) {
pr_info("Intel-IOMMU: scalable mode supported\n");
intel_iommu_sm = 1;
} else if (!strncmp(str, "tboot_noforce", 13)) {
printk(KERN_INFO
"Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n");