On 14.09.2022 01:31, Stefano Stabellini wrote: > The problem is that drivers/xen/privcmd.c:privcmd_mmap sets VM_IO | > VM_PFNMAP, and either flag would cause check_vma_flags to return > -EFAULT. > > Do you know if it works if you remove VM_IO | VM_PFNMAP from > privcmd_mmap?
My Linux MM knowledge is certainly rusty, but I don't think this can work, at the very least not without further changes elsewhere. I did look some at the specific use by the TEE subsystem, and it looks to me as if their "shared memory" machinery simply isn't meant to be used with non-local memory. Jan
