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iommu/vt-d: Flush IOTLB for untrusted device in time
By default, for performance consideration, Intel IOMMU driver won't flush IOTLB immediately after a buffer is unmapped. It schedules a thread and flushes IOTLB in a batched mode. This isn't suitable for untrusted device since it still can access the memory even if it isn't supposed to do so. Cc: Ashok Raj <ashok.raj@intel.com> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Tested-by: Xu Pengfei <pengfei.xu@intel.com> Tested-by: Mika Westerberg <mika.westerberg@intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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1 changed files with 5 additions and 1 deletions
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@ -3729,6 +3729,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
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unsigned long iova_pfn;
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unsigned long iova_pfn;
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struct intel_iommu *iommu;
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struct intel_iommu *iommu;
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struct page *freelist;
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struct page *freelist;
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struct pci_dev *pdev = NULL;
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domain = find_domain(dev);
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domain = find_domain(dev);
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BUG_ON(!domain);
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BUG_ON(!domain);
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@ -3741,11 +3742,14 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
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start_pfn = mm_to_dma_pfn(iova_pfn);
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start_pfn = mm_to_dma_pfn(iova_pfn);
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last_pfn = start_pfn + nrpages - 1;
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last_pfn = start_pfn + nrpages - 1;
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if (dev_is_pci(dev))
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pdev = to_pci_dev(dev);
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dev_dbg(dev, "Device unmapping: pfn %lx-%lx\n", start_pfn, last_pfn);
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dev_dbg(dev, "Device unmapping: pfn %lx-%lx\n", start_pfn, last_pfn);
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freelist = domain_unmap(domain, start_pfn, last_pfn);
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freelist = domain_unmap(domain, start_pfn, last_pfn);
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if (intel_iommu_strict) {
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if (intel_iommu_strict || (pdev && pdev->untrusted)) {
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iommu_flush_iotlb_psi(iommu, domain, start_pfn,
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iommu_flush_iotlb_psi(iommu, domain, start_pfn,
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nrpages, !freelist, 0);
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nrpages, !freelist, 0);
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/* free iova */
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/* free iova */
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