On Thu, 13 Jun 2019 07:14:47 +0000 "'awokd' via qubes-users" <[email protected]> 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. > There has been a thread on the Linux Kernel mailing list recently, discussing the need to re-enable the SMT chips during resume else something breaks, and then turn them off again. You may be one of the unlucky ones to heave this affecting your system. I'm not sure which new kernel the fix is in - may not be until 5.2 comes out. Mike. -- 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 [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/20190613153859.0ed532ef.mike%40keehan.net. For more options, visit https://groups.google.com/d/optout.
