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| author | David S. Miller <davem@davemloft.net> | 2016-01-01 00:20:10 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-01-01 00:20:10 +0100 |
| commit | c07f30ad68053181b3e8a0e65b0630e12e844f91 (patch) | |
| tree | 8758968aabc844c435ff2a5d7d02c835fccd02a3 /drivers/iommu/intel-svm.c | |
| parent | Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/... (diff) | |
| parent | Merge tag 'pci-v4.4-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git... (diff) | |
| download | linux-c07f30ad68053181b3e8a0e65b0630e12e844f91.tar.xz linux-c07f30ad68053181b3e8a0e65b0630e12e844f91.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'drivers/iommu/intel-svm.c')
| -rw-r--r-- | drivers/iommu/intel-svm.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index c69e3f9ec958..50464833d0b8 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -484,6 +484,23 @@ struct page_req_dsc { }; #define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x10) + +static bool access_error(struct vm_area_struct *vma, struct page_req_dsc *req) +{ + unsigned long requested = 0; + + if (req->exe_req) + requested |= VM_EXEC; + + if (req->rd_req) + requested |= VM_READ; + + if (req->wr_req) + requested |= VM_WRITE; + + return (requested & ~vma->vm_flags) != 0; +} + static irqreturn_t prq_event_thread(int irq, void *d) { struct intel_iommu *iommu = d; @@ -539,6 +556,9 @@ static irqreturn_t prq_event_thread(int irq, void *d) if (!vma || address < vma->vm_start) goto invalid; + if (access_error(vma, req)) + goto invalid; + ret = handle_mm_fault(svm->mm, vma, address, req->wr_req ? FAULT_FLAG_WRITE : 0); if (ret & VM_FAULT_ERROR) |