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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2019-04-12 07:26:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-15 12:53:01 +0300 |
| commit | 189a9522fab8634d97723ecd093ca196033fd234 (patch) | |
| tree | 96fc6adff0bc7b6d2999ecae388b0d739a61d25f /drivers/iommu | |
| parent | 80245980872419490f4b43fb78c0f519e02b5bec (diff) | |
| download | linux-189a9522fab8634d97723ecd093ca196033fd234.tar.xz | |
iommu/vt-d: Flush IOTLB for untrusted device in time
[ Upstream commit f7b0c4ce8cb3c09cb3cbfc0c663268bf99e5fa9c ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index cb656f503604..0feb3f70da16 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3736,6 +3736,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size) unsigned long iova_pfn; struct intel_iommu *iommu; struct page *freelist; + struct pci_dev *pdev = NULL; if (iommu_no_mapping(dev)) return; @@ -3751,11 +3752,14 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size) start_pfn = mm_to_dma_pfn(iova_pfn); 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); 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, nrpages, !freelist, 0); /* free iova */ |