Hi,
On 29/05/2020 14:26, Roger Pau Monné wrote:
TBH I would just remove the error message on Arm from the current
hypercall, I don't think it's useful.
The message is part of the helpers get_page_from_gva() which is also
used by copy_{to, from}_guest. While it may not be useful in the context
of the runstate, it was introduced because there was some other weird
bug happening before KPTI even existed (see [1]). I haven't yet managed
to find the bottom line of the issue.
So I would still very much like to keep the message in place. Although
we could reduce the number of cases where this is hapenning based on the
fault.
Note this is a dprintk(XENLOG_G_DEBUG,...) so the verbosity of the
logging is only for debug build.
Cheers,
[1] https://lists.xen.org/archives/html/xen-devel/2017-11/msg00942.html
--
Julien Grall
