On Fri, Jan 05, 2018 at 05:09:25PM +0100, Thomas Deutschmann wrote:

Hi Greg,

sorry, I lost the overview -- the KPTI 4.14, 4.9 and 4.4 patch set is diverging...

4.14 follows Linus's tree almost identically.

4.4 and 4.9 should be identical as well, they come from the work of Hugh from Google and lots of cleanups on top of that from the SUSE developers.

I am missing patches like

x86/pti: Switch to kernel CR3 at early in entry_SYSCALL_compat() x86/pti: Make sure the user/kernel PTEs match

in 4.9.

What are those git commit ids? And are they really relevant for 4.9?

The first one was really important but the problem might be hidden now due to

x86/cpu, x86/pti: Do not enable PTI on AMD processors

So have you tested the backports? Can you provide a copy of them?

thanks,

greg k-h