iommu/vt-d: Avoid panic if iommu init fails in tboot system
[ Upstream commit5.4-rM2-2.2.x-imx-squashed4d213e76a3
] "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:7304e8f28b
("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> Signed-off-by: Sasha Levin <sashal@kernel.org>
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964b02d50b
commit
58f1657c3a
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@ -512,9 +512,6 @@ int tboot_force_iommu(void)
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if (!tboot_enabled())
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if (!tboot_enabled())
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return 0;
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return 0;
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if (intel_iommu_tboot_noforce)
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return 1;
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if (no_iommu || swiotlb || dmar_disabled)
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if (no_iommu || swiotlb || dmar_disabled)
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pr_warning("Forcing Intel-IOMMU to enabled\n");
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pr_warning("Forcing Intel-IOMMU to enabled\n");
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@ -179,7 +179,7 @@ static int rwbf_quirk;
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* (used when kernel is launched w/ TXT)
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* (used when kernel is launched w/ TXT)
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*/
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*/
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static int force_on = 0;
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static int force_on = 0;
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int intel_iommu_tboot_noforce;
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static int intel_iommu_tboot_noforce;
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static int no_platform_optin;
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static int no_platform_optin;
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#define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
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#define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry))
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@ -4927,7 +4927,8 @@ int __init intel_iommu_init(void)
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* Intel IOMMU is required for a TXT/tboot launch or platform
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* Intel IOMMU is required for a TXT/tboot launch or platform
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* opt in, so enforce that.
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* opt in, so enforce that.
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*/
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*/
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force_on = tboot_force_iommu() || platform_optin_force_iommu();
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force_on = (!intel_iommu_tboot_noforce && tboot_force_iommu()) ||
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platform_optin_force_iommu();
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if (iommu_init_mempool()) {
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if (iommu_init_mempool()) {
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if (force_on)
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if (force_on)
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@ -706,7 +706,6 @@ extern int iommu_calculate_agaw(struct intel_iommu *iommu);
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extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
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extern int iommu_calculate_max_sagaw(struct intel_iommu *iommu);
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extern int dmar_disabled;
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extern int dmar_disabled;
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extern int intel_iommu_enabled;
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extern int intel_iommu_enabled;
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extern int intel_iommu_tboot_noforce;
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extern int intel_iommu_gfx_mapped;
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extern int intel_iommu_gfx_mapped;
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#else
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#else
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static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
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static inline int iommu_calculate_agaw(struct intel_iommu *iommu)
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