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Re: Linux pin_user_pages_fast fails on Xen
- To: Stefano Stabellini <stefano.stabellini@xxxxxxx>
- From: Stefano Stabellini <stefano.stabellini@xxxxxxx>
- Date: Thu, 8 Sep 2022 19:11:05 -0700
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- Cc: <jgross@xxxxxxxx>, <boris.ostrovsky@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>, <JESHWANTHKUMAR.NK@xxxxxxx>, <Devaraj.Rangasamy@xxxxxxx>, <Mythri.Pandeshwarakrishna@xxxxxxx>, <SivaSangeetha.SK@xxxxxxx>, <Rijo-john.Thomas@xxxxxxx>
- Delivery-date: Fri, 09 Sep 2022 02:11:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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
>
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