Commit 189a9522 authored by Lu Baolu's avatar Lu Baolu Committed by Greg Kroah-Hartman

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

[ Upstream commit f7b0c4ce ]

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: default avatarLu Baolu <baolu.lu@linux.intel.com>
Tested-by: default avatarXu Pengfei <pengfei.xu@intel.com>
Tested-by: default avatarMika Westerberg <mika.westerberg@intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 80245980
......@@ -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 */
......
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