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| author | Zhenzhong Duan <zhenzhong.duan@gmail.com> | 2020-11-10 15:19:08 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-11-18 13:09:07 +0000 |
| commit | 4d213e76a359e540ca786ee937da7f35faa8e5f8 (patch) | |
| tree | 455ca92a82454a3473fe541edc9f58c0aae6f3ea /arch/x86/kernel | |
| parent | f8394f232b1eab649ce2df5c5f15b0e528c92091 (diff) | |
| download | lwn-4d213e76a359e540ca786ee937da7f35faa8e5f8.tar.gz lwn-4d213e76a359e540ca786ee937da7f35faa8e5f8.zip | |
iommu/vt-d: Avoid panic if iommu init fails in tboot system
"intel_iommu=off" command line is used to disable iommu but iommu is force
enabled in a tboot system for security reason.
However for better performance on high speed network device, a new option
"intel_iommu=tboot_noforce" is introduced to disable the force on.
By default kernel should panic if iommu init fail in tboot for security
reason, but it's unnecessory if we use "intel_iommu=tboot_noforce,off".
Fix the code setting force_on and move intel_iommu_tboot_noforce
from tboot code to intel iommu code.
Fixes: 7304e8f28bb2 ("iommu/vt-d: Correctly disable Intel IOMMU force on")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@gmail.com>
Tested-by: Lukasz Hawrylko <lukasz.hawrylko@linux.intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20201110071908.3133-1-zhenzhong.duan@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/tboot.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 992fb1415c0f..420be871d9d4 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -514,9 +514,6 @@ int tboot_force_iommu(void) if (!tboot_enabled()) return 0; - if (intel_iommu_tboot_noforce) - return 1; - if (no_iommu || swiotlb || dmar_disabled) pr_warn("Forcing Intel-IOMMU to enabled\n"); |