diff options
| author | Lu Baolu | 2019-04-12 12:26:13 +0800 |
|---|---|---|
| committer | Joerg Roedel | 2019-04-12 13:02:42 +0200 |
| commit | f7b0c4ce8cb3c09cb3cbfc0c663268bf99e5fa9c (patch) | |
| tree | 4817c10480458ebb352f30cc5158c3a235c4bfa2 /drivers/iommu | |
| parent | be068fa236c3d697c77f02f3dc9cd7afeb0538a6 (diff) | |
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>
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 599a25809440..d93c4bd7de75 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -3729,6 +3729,7 @@ 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; domain = find_domain(dev); 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); 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 */ |