36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
From: kiler129 <grzegorz@noflash.pl>
|
|
|
|
allow opt-in to allow pass-through on broken hardware..
|
|
|
|
adapted from https://github.com/kiler129/relax-intel-rmrr , licensed under MIT or GPL 2.0+
|
|
|
|
--- a/drivers/iommu/intel/iommu.c
|
|
+++ b/drivers/iommu/intel/iommu.c
|
|
@@ -297,6 +297,7 @@
|
|
static int dmar_map_ipu = 1;
|
|
static int intel_iommu_superpage = 1;
|
|
static int iommu_identity_mapping;
|
|
+static int intel_relaxable_rmrr = 0;
|
|
static int iommu_skip_te_disable;
|
|
|
|
#define IDENTMAP_GFX 2
|
|
@@ -358,6 +359,9 @@
|
|
} else if (!strncmp(str, "tboot_noforce", 13)) {
|
|
pr_info("Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n");
|
|
intel_iommu_tboot_noforce = 1;
|
|
+ } else if (!strncmp(str, "relax_rmrr", 10)) {
|
|
+ pr_info("Intel-IOMMU: assuming all RMRRs are relaxable. This can lead to instability or data loss\n");
|
|
+ intel_relaxable_rmrr = 1;
|
|
} else {
|
|
pr_notice("Unknown option - '%s'\n", str);
|
|
}
|
|
@@ -2538,7 +2542,7 @@
|
|
return false;
|
|
|
|
pdev = to_pci_dev(dev);
|
|
- if (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev))
|
|
+ if (intel_relaxable_rmrr || IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev))
|
|
return true;
|
|
else
|
|
return false;
|