Adding more people in CC
On Thu, 8 Sep 2022, Stefano Stabellini wrote:
> 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
>
