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iommu/vt-d: Make root entry visible for hardware right after allocation
In case there was an old root entry, make our new one visible immediately after it was allocated. Tested-by: ZhenHua Li <zhen-hual@hp.com> Tested-by: Baoquan He <bhe@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -2817,6 +2817,12 @@ static int __init init_dmars(void)
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ret = iommu_alloc_root_entry(iommu);
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if (ret)
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goto free_iommu;
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iommu_flush_write_buffer(iommu);
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iommu_set_root_entry(iommu);
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iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
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iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
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if (!ecap_pass_through(iommu->ecap))
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hw_pass_through = 0;
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}
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@ -2893,10 +2899,6 @@ static int __init init_dmars(void)
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if (ret)
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goto free_iommu;
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iommu_set_root_entry(iommu);
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iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
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iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
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iommu_enable_translation(iommu);
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iommu_disable_protect_mem_regions(iommu);
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}
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