Messages in this thread Patch in this message | | | From | Lu Baolu <> | Subject | [PATCH 4/5] iommu/vt-d: Disallow SVA if devices don't support 64-bit address | Date | Tue, 20 Jul 2021 09:38:55 +0800 |
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When the device and CPU share an address space (such as SVA), the device must support the same addressing capability as the CPU. The CPU does not consider the addressing ability of any device when managing the page table of a process, so the device must have enough addressing ability to bind the page table of the process.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> --- drivers/iommu/intel/iommu.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index f45c80ce2381..f3cca1dd384d 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5372,6 +5372,9 @@ static int intel_iommu_enable_sva(struct device *dev) if (!(iommu->flags & VTD_FLAG_SVM_CAPABLE)) return -ENODEV; + if (!dev->dma_mask || *dev->dma_mask != DMA_BIT_MASK(64)) + return -ENODEV; + if (intel_iommu_enable_pasid(iommu, dev)) return -ENODEV; -- 2.25.1
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