From: Lu Baolu <baolu.lu@linux.intel.com>
To: David Woodhouse <dwmw2@infradead.org>,
Joerg Roedel <joro@8bytes.org>,
ashok.raj@intel.com, jacob.jun.pan@intel.com, alan.cox@intel.com,
kevin.tian@intel.com, mika.westerberg@linux.intel.com,
pengfei.xu@intel.com
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Lu Baolu <baolu.lu@linux.intel.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v1 8/9] iommu/vt-d: Flush IOTLB for untrusted device in time
Date: Tue, 12 Mar 2019 14:00:04 +0800 [thread overview]
Message-ID: <20190312060005.12189-9-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20190312060005.12189-1-baolu.lu@linux.intel.com>
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>
---
drivers/iommu/intel-iommu.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 36909f8e7788..4f2fdd68658c 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3749,10 +3749,14 @@ 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;
+ if (dev_is_pci(dev))
+ pdev = to_pci_dev(dev);
+
domain = find_domain(dev);
BUG_ON(!domain);
@@ -3768,7 +3772,7 @@ static void intel_unmap(struct device *dev, dma_addr_t dev_addr, size_t size)
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 */
--
2.17.1
next prev parent reply other threads:[~2019-03-12 6:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-12 5:59 [PATCH v1 0/9] Bounce buffer for untrusted devices Lu Baolu
2019-03-12 5:59 ` [PATCH v1 1/9] iommu/vt-d: Add trace events for domain map/unmap Lu Baolu
2019-03-12 5:59 ` [PATCH v1 2/9] iommu/vt-d: Add helpers for domain mapping/unmapping Lu Baolu
2019-03-12 5:59 ` [PATCH v1 3/9] iommu/vt-d: Add address walk helper Lu Baolu
[not found] ` <20190312060005.12189-1-baolu.lu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2019-03-12 6:00 ` [PATCH v1 4/9] iommu/vt-d: Add bounce buffer API for domain map/unmap Lu Baolu
2019-03-12 16:38 ` Christoph Hellwig
2019-03-13 2:04 ` Lu Baolu
[not found] ` <e653341d-e001-7262-740b-2262842be06d-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2019-03-13 2:31 ` Lu Baolu
[not found] ` <c9fe7879-569e-b4f4-d6ec-47ab7e6fd443-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2019-03-13 16:10 ` Christoph Hellwig
[not found] ` <20190313161029.GA23513-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2019-03-14 1:01 ` Lu Baolu
2019-03-19 7:59 ` Lu Baolu
2019-03-19 11:21 ` Robin Murphy
2019-03-12 6:00 ` [PATCH v1 5/9] iommu/vt-d: Add bounce buffer API for dma sync Lu Baolu
2019-03-12 6:00 ` [PATCH v1 6/9] iommu/vt-d: Check whether device requires bounce buffer Lu Baolu
2019-03-12 6:00 ` [PATCH v1 7/9] iommu/vt-d: Add dma sync ops for untrusted devices Lu Baolu
2019-03-12 6:00 ` Lu Baolu [this message]
2019-03-12 6:00 ` [PATCH v1 9/9] iommu/vt-d: Use bounce buffer " Lu Baolu
2019-03-12 6:07 ` [PATCH v1 0/9] Bounce " Lu Baolu
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