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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 <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-05-25 13:41:25 +08:00 committed by Joerg Roedel
parent d850c2ee5f
commit d8190dc638
1 changed files with 10 additions and 6 deletions
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16
drivers/iommu/intel-iommu.c
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@ -3510,11 +3510,6 @@ domains_done:
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;
@ -4902,7 +4897,6 @@ 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;
@ -4925,6 +4919,16 @@ 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();