On 6/13/19 7:14 AM, 'awokd' via qubes-users wrote:
Jon deps:
On 6/12/19 8:14 AM, Jon deps wrote:
Jun 12 07:52:01 dom0 kernel: MDS CPU bug present and SMT on, data
leak possible. See
https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
for more details.
.....any idea on the "data leak possible" journal entry?
sounds a bit scary, maybe I need to look around in my UEFI to
disable some cache-ing ?
SMT should be off. Do you see that same message if you do a cold power
on? Also, in "sudo cat /boot/efi/EFI/qubes/xen.cfg", do you see
"smt=off" in the Xen options lines?
I wonder if there is a Xen bug making SMT re-enable after a resume.
Please check the above, then look in your UEFI options to disable
Hyperthreading/SMT.
in my case turns out, I have an Intel i5 which apparently doesn't have
multithreading,
I did look around the UEFI anyway, and see no references to it
sudo cat /boot/efi/EFI/qubes/xen.cfg
has 4.19.43-1 smt=off
on cold reboot I don't see the kernel vuln journal entry
so I guess its as I suspected qubes isn't going to suspend well and
may break various things ??
--
You received this message because you are subscribed to the Google Groups
"qubes-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to qubes-users+unsubscr...@googlegroups.com.
To post to this group, send email to qubes-users@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/qubes-users/f9d75e67-730b-d3b0-11af-1e099b144fa7%40riseup.net.
For more options, visit https://groups.google.com/d/optout.