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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>
This commit is contained in:
Joerg Roedel 2015-06-12 09:18:53 +02:00
parent b63d80d1e0
commit 5f0a7f7614
1 changed files with 6 additions and 4 deletions
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10
drivers/iommu/intel-iommu.c
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@ -2817,6 +2817,12 @@ static int __init init_dmars(void)
ret = iommu_alloc_root_entry(iommu);
if (ret)
goto free_iommu;
iommu_flush_write_buffer(iommu);
iommu_set_root_entry(iommu);
iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
if (!ecap_pass_through(iommu->ecap))
hw_pass_through = 0;
}
@ -2893,10 +2899,6 @@ static int __init init_dmars(void)
if (ret)
goto free_iommu;
iommu_set_root_entry(iommu);
iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL);
iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
iommu_enable_translation(iommu);
iommu_disable_protect_mem_regions(iommu);
}