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Linux pin_user_pages_fast fails on Xen
- To: <jgross@xxxxxxxx>, <boris.ostrovsky@xxxxxxxxxx>
- From: Stefano Stabellini <stefano.stabellini@xxxxxxx>
- Date: Thu, 8 Sep 2022 19:10:10 -0700
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- Cc: <stefano.stabellini@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 09 Sep 2022 02:10:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Juergen,
A colleague is seeing a failure on x86 in Linux Dom0. The failure is
pin_user_pages_fast with addresses that correspond to foreign memory
pages:
- QEMU maps a domU address using dma_memory_map (xen_map_cache)
- QEMU calls an IOCTL to the TEE subsystem with the Virtual Address
returned by dma_memory_map
- Linux tee_shm_register->pin_user_pages_fast Returns -14 -
drivers/tee/tee_shm.c
Once upon a time it used to be the case that get_user_pages_fast would
fail on Xen because we didn't have a struct page corresponding to
foreign memory mappings. But that hasn't been the case for years now.
Any other ideas why it would fail?
Cheers,
Stefano
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