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Commit | Line | Data |
---|---|---|
1 | From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 | |
2 | From: kiler129 <grzegorz@noflash.pl> | |
3 | Date: Mon, 18 Sep 2023 15:19:26 +0200 | |
4 | Subject: [PATCH] allow opt-in to allow pass-through on broken hardware.. | |
5 | ||
6 | adapted from https://github.com/kiler129/relax-intel-rmrr , licensed under MIT or GPL 2.0+ | |
7 | ||
8 | Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com> | |
9 | --- | |
10 | drivers/iommu/intel/iommu.c | 6 +++++- | |
11 | 1 file changed, 5 insertions(+), 1 deletion(-) | |
12 | ||
13 | diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c | |
14 | index a788062820df..4020c5336369 100644 | |
15 | --- a/drivers/iommu/intel/iommu.c | |
16 | +++ b/drivers/iommu/intel/iommu.c | |
17 | @@ -159,6 +159,7 @@ static int dmar_map_gfx = 1; | |
18 | static int dmar_map_ipu = 1; | |
19 | static int intel_iommu_superpage = 1; | |
20 | static int iommu_identity_mapping; | |
21 | +static int intel_relaxable_rmrr = 0; | |
22 | static int iommu_skip_te_disable; | |
23 | ||
24 | #define IDENTMAP_GFX 2 | |
25 | @@ -221,6 +222,9 @@ static int __init intel_iommu_setup(char *str) | |
26 | } else if (!strncmp(str, "tboot_noforce", 13)) { | |
27 | pr_info("Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n"); | |
28 | intel_iommu_tboot_noforce = 1; | |
29 | + } else if (!strncmp(str, "relax_rmrr", 10)) { | |
30 | + pr_info("Intel-IOMMU: assuming all RMRRs are relaxable. This can lead to instability or data loss\n"); | |
31 | + intel_relaxable_rmrr = 1; | |
32 | } else { | |
33 | pr_notice("Unknown option - '%s'\n", str); | |
34 | } | |
35 | @@ -2395,7 +2399,7 @@ static bool device_rmrr_is_relaxable(struct device *dev) | |
36 | return false; | |
37 | ||
38 | pdev = to_pci_dev(dev); | |
39 | - if (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev)) | |
40 | + if (intel_relaxable_rmrr || IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev)) | |
41 | return true; | |
42 | else | |
43 | return false; |