Am 09.02.2018 um 14:32 schrieb Tom St Denis:
On 02/02/18 02:09 PM, Christian König wrote:
+        if (p->mapping != adev->mman.bdev.dev_mapping)
+            return -EPERM;

This comparison fails for both IOMMU and non-IOMMU devices in my carrizo+polaris10 box.

The address being read from is what the VM decodes to (checked with strace).

Have you applied the whole series? That patches before this one are necessary to initialize p->mapping when there isn't any userspace mapping for the page.



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