From 06cabc10e1728142650e545b0038ffb512b45aff Mon Sep 17 00:00:00 2001 From: James Sewart Date: Fri, 8 Mar 2019 16:12:34 +0000 Subject: [PATCH 7/9] iommu/vt-d: Enable DMA remapping after rmrr mapped The rmrr devices require identity map of the rmrr regions before enabling DMA remapping. Otherwise, there will be a window during which DMA from/to the rmrr regions will be blocked. In order to alleviate this, we move enabling DMA remapping after all rmrr regions get mapped. Signed-off-by: Lu Baolu diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index e79df3cf548c..3a06e8804b6e 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3519,11 +3519,6 @@ static int __init init_dmars(void) ret = dmar_set_interrupt(iommu); if (ret) goto free_iommu; - - if (!translation_pre_enabled(iommu)) - iommu_enable_translation(iommu); - - iommu_disable_protect_mem_regions(iommu); } return 0; @@ -4921,7 +4916,6 @@ int __init intel_iommu_init(void) goto out_free_reserved_range; } up_write(&dmar_global_lock); - pr_info("Intel(R) Virtualization Technology for Directed I/O\n"); #if defined(CONFIG_X86) && defined(CONFIG_SWIOTLB) swiotlb = 0; @@ -4944,6 +4938,16 @@ int __init intel_iommu_init(void) register_memory_notifier(&intel_iommu_memory_nb); cpuhp_setup_state(CPUHP_IOMMU_INTEL_DEAD, "iommu/intel:dead", NULL, intel_iommu_cpu_dead); + + /* Finally, we enable the DMA remapping hardware. */ + for_each_iommu(iommu, drhd) { + if (!translation_pre_enabled(iommu)) + iommu_enable_translation(iommu); + + iommu_disable_protect_mem_regions(iommu); + } + pr_info("Intel(R) Virtualization Technology for Directed I/O\n"); + intel_iommu_enabled = 1; intel_iommu_debugfs_init(); -- 2.17.1