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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] How to deal with hypercalls returning -EFAULT
>>> On 14.06.18 at 10:48, <jgross@xxxxxxxx> wrote: > On 14/06/18 10:17, Julien Grall wrote: >> On Thu, 14 Jun 2018, 07:40 Juergen Gross, <jgross@xxxxxxxx >> <mailto:jgross@xxxxxxxx>> wrote: >> >> On 13/06/18 18:25, Andrew Cooper wrote: >> > On 13/06/18 16:27, Juergen Gross wrote: >> >> Looking more into the privcmd driver I'm rather sure now I can solve >> this via mmap() plus an ioctl(). So the kernel would allocate the >> bounce buffers and map them into user space. This will require changes >> only in libxencall without having to modify its external interface. >> >> >> It looks like David Vrabel sent in 2016 a patch implementing that >> solution [1]. It seems it has not been merged. Do you have any insight >> why it was not merged? > > No. It had all needed Acks and there were no open questions. > > Thanks for the reference, I think I can just reuse the patch after some > rebasing. But I still wonder whether retaining references obtained through get_user_pages_fast() across system calls is a legitimate thing to do. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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