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iommu/vt-d: Flush IOTLB for untrusted device in time

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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>
This commit is contained in:
Lu Baolu 2019-04-12 12:26:13 +08:00 • committed by Joerg Roedel
parent be068fa236
commit f7b0c4ce8c
1 changed files with 5 additions and 1 deletions
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6
drivers/iommu/intel-iommu.c
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@ -3729,6 +3729,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
unsigned long iova_pfn; unsigned long iova_pfn;
struct intel_iommu *iommu; struct intel_iommu *iommu;
struct page *freelist; struct page *freelist;
struct pci_dev *pdev = NULL;
domain = find_domain(dev); domain = find_domain(dev);
BUG_ON(!domain); BUG_ON(!domain);
@ -3741,11 +3742,14 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
start_pfn = mm_to_dma_pfn(iova_pfn); start_pfn = mm_to_dma_pfn(iova_pfn);
last_pfn = start_pfn + nrpages - 1; last_pfn = start_pfn + nrpages - 1;
if (dev_is_pci(dev))
pdev = to_pci_dev(dev);
dev_dbg(dev, "Device unmapping: pfn %lx-%lx\n", start_pfn, last_pfn); dev_dbg(dev, "Device unmapping: pfn %lx-%lx\n", start_pfn, last_pfn);
freelist = domain_unmap(domain, start_pfn, last_pfn); freelist = domain_unmap(domain, start_pfn, last_pfn);
if (intel_iommu_strict) { if (intel_iommu_strict || (pdev && pdev->untrusted)) {
iommu_flush_iotlb_psi(iommu, domain, start_pfn, iommu_flush_iotlb_psi(iommu, domain, start_pfn,
nrpages, !freelist, 0); nrpages, !freelist, 0);
/* free iova */ /* free iova */