]>
Commit | Line | Data |
---|---|---|
1acfcad2 FG |
1 | From: kiler129 <grzegorz@noflash.pl> |
2 | ||
3 | allow opt-in to allow pass-through on broken hardware.. | |
4 | ||
5 | adapted from https://github.com/kiler129/relax-intel-rmrr , licensed under MIT or GPL 2.0+ | |
6 | ||
7 | --- a/drivers/iommu/intel/iommu.c | |
8 | +++ b/drivers/iommu/intel/iommu.c | |
9 | @@ -297,6 +297,7 @@ | |
10 | static int dmar_map_ipu = 1; | |
11 | static int intel_iommu_superpage = 1; | |
12 | static int iommu_identity_mapping; | |
13 | +static int intel_relaxable_rmrr = 0; | |
14 | static int iommu_skip_te_disable; | |
15 | ||
16 | #define IDENTMAP_GFX 2 | |
17 | @@ -358,6 +359,9 @@ | |
18 | } else if (!strncmp(str, "tboot_noforce", 13)) { | |
19 | pr_info("Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n"); | |
20 | intel_iommu_tboot_noforce = 1; | |
21 | + } else if (!strncmp(str, "relax_rmrr", 10)) { | |
22 | + pr_info("Intel-IOMMU: assuming all RMRRs are relaxable. This can lead to instability or data loss\n"); | |
23 | + intel_relaxable_rmrr = 1; | |
24 | } else { | |
25 | pr_notice("Unknown option - '%s'\n", str); | |
26 | } | |
27 | @@ -2538,7 +2542,7 @@ | |
28 | return false; | |
29 | ||
30 | pdev = to_pci_dev(dev); | |
31 | - if (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev)) | |
32 | + if (intel_relaxable_rmrr || IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev)) | |
33 | return true; | |
34 | else | |
35 | return false; |