On Thu, Aug 16, 2018 at 6:39 PM Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
On Thu, Aug 16, 2018 at 06:28:59PM +0200, Jinpu Wang wrote:
On Thu, Aug 16, 2018 at 5:51 PM Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
On Thu, Aug 16, 2018 at 05:43:23PM +0200, Jinpu Wang wrote:
Hi Greg, hi Thomas,
I noticed /sys/devices/system/cpu/smt dir is missing on 4.4.148 and 4.14.63, default setting.
For 4.4, I would be amazed if anything was there, the backport was done only to handle the local user issue, not the "full" protection. So please try 4.9 or 4.14.
Thanks for quick reply. Right, just checked. the patch for create the sysfs entry is missing.
What patch is that? What is the git commit id that we missed?
How about 4.17 and 4.18, do those trees work properly for you?
I guess it's the same.
Tried stable/master branch 31130a16d459 ("Merge tag 'for-linus-4.19-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip") It's the same there.
Ah, so we are bug compatible, good :)
I will try test stable master a bit more to gather the full log.
When boot with 'nosmt' kernel paramter kernel 4.14.63 panic during boot, 4.4.148 boot fine. The call trace seem irq related, is it known bug?
You are not giving us much to go on here sorry. We need full details, and also please cc: lkml and the other developers who worked on this. THomas is on vacation this week.
Now, add more developers to cc, also lkml.
I have the config and boot dmesg attached for default setting.
I see no error in your boot log, what exactly are you worried about?
2 problems here: 1 According to https://www.kernel.org/doc/html/latest/admin-guide/l1tf.html I expect /sys/devices/system/cpu/smt/, but it's not. 2 kernel 4.14.63 panic when I boot with 'nosmt' or 'l1tf=full', I attached the picture here again, I will try to get the full log tomorrow, also test with linus tree.
confused,
greg k-h
Thanks
