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iommu/vt-d: Leave scalable mode default off 

Commit 765b6a98c1 ("iommu/vt-d: Enumerate the scalable
mode capability") enables VT-d scalable mode if hardware
advertises the capability. As we will bring up different
features and use cases to upstream in different patch
series, it will leave some intermediate kernel versions
which support partial features. Hence, end user might run
into problems when they use such kernels on bare metals
or virtualization environments.

This leaves scalable mode default off and end users could
turn it on with "intel-iommu=sm_on" only when they have
clear ideas about which scalable features are supported
in the kernel.

Cc: Liu Yi L <yi.l.liu@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Suggested-by: Ashok Raj <ashok.raj@intel.com>
Suggested-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-01-24 10:31:32 +08:00 committed by Joerg Roedel
parent 9825bd94e3
commit 8950dcd83a
2 changed files with 7 additions and 8 deletions
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7
Documentation/admin-guide/kernel-parameters.txt
View File

@ -1696,12 +1696,11 @@
By default, super page will be supported if Intel IOMMU By default, super page will be supported if Intel IOMMU
has the capability. With this option, super page will has the capability. With this option, super page will
not be supported. not be supported.
sm_off [Default Off] sm_on [Default Off]
By default, scalable mode will be supported if the By default, scalable mode will be disabled even if the
hardware advertises that it has support for the scalable hardware advertises that it has support for the scalable
mode translation. With this option set, scalable mode mode translation. With this option set, scalable mode
will not be used even on hardware which claims to support will be used on hardware which claims to support it.
it.
tboot_noforce [Default Off] tboot_noforce [Default Off]
Do not force the Intel IOMMU enabled under tboot. Do not force the Intel IOMMU enabled under tboot.
By default, tboot will force Intel IOMMU on, which 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 dmar_forcedac;
static int intel_iommu_strict; static int intel_iommu_strict;
static int intel_iommu_superpage = 1; static int intel_iommu_superpage = 1;
static int intel_iommu_sm = 1; static int intel_iommu_sm;
static int iommu_identity_mapping; static int iommu_identity_mapping;
#define IDENTMAP_ALL 1 #define IDENTMAP_ALL 1
@ -456,9 +456,9 @@ static int __init intel_iommu_setup(char *str)
} else if (!strncmp(str, "sp_off", 6)) { } else if (!strncmp(str, "sp_off", 6)) {
pr_info("Disable supported super page\n"); pr_info("Disable supported super page\n");
intel_iommu_superpage = 0; intel_iommu_superpage = 0;
} else if (!strncmp(str, "sm_off", 6)) { } else if (!strncmp(str, "sm_on", 5)) {
pr_info("Intel-IOMMU: disable scalable mode support\n"); pr_info("Intel-IOMMU: scalable mode supported\n");
intel_iommu_sm = 0; intel_iommu_sm = 1;
} else if (!strncmp(str, "tboot_noforce", 13)) { } else if (!strncmp(str, "tboot_noforce", 13)) {
printk(KERN_INFO printk(KERN_INFO
"Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n"); "Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n");