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