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authorLu Baolu <baolu.lu@linux.intel.com>2019-04-12 12:26:13 +0800
committerJoerg Roedel <jroedel@suse.de>2019-04-12 13:02:42 +0200
commitf7b0c4ce8cb3c09cb3cbfc0c663268bf99e5fa9c (patch)
tree4817c10480458ebb352f30cc5158c3a235c4bfa2 /drivers/iommu
parentbe068fa236c3d697c77f02f3dc9cd7afeb0538a6 (diff)
downloadlinux-f7b0c4ce8cb3c09cb3cbfc0c663268bf99e5fa9c.tar.bz2
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.c6
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 */