On Fri, Mar 09, 2018 at 05:04:39PM -0800, Tim Chen wrote: > On 03/08/2018 10:23 AM, Tim Chen wrote: > > On 03/07/2018 09:30 AM, Greg Kroah-Hartman wrote: > >> On Fri, Mar 02, 2018 at 01:32:09PM -0800, Tim Chen wrote: > >>> From: Andy Lutomirski <luto@xxxxxxxxxx> > >>> commit: f39681ed0f48498b80455095376f11535feea332 > >>> > >>> This adds a new variable to mmu_context_t: ctx_id. > >>> ctx_id uniquely identifies the mm_struct and will never be reused. > >>> > >>> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx> > >>> Reviewed-by: Nadav Amit <nadav.amit@xxxxxxxxx> > >>> Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > >>> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > >>> Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx> > >>> Cc: Borislav Petkov <bp@xxxxxxxxx> > >>> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> > >>> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > >>> Cc: Mel Gorman <mgorman@xxxxxxx> > >>> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > >>> Cc: Rik van Riel <riel@xxxxxxxxxx> > >>> Cc: linux-mm@xxxxxxxxx > >>> Link: http://lkml.kernel.org/r/413a91c24dab3ed0caa5f4e4d017d87b0857f920.1498751203.git.luto@xxxxxxxxxx > >>> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> > >>> Signed-off-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> > >>> --- > >>> arch/x86/include/asm/mmu.h | 15 +++++++++++++-- > >>> arch/x86/include/asm/mmu_context.h | 5 +++++ > >>> arch/x86/mm/tlb.c | 2 ++ > >>> 3 files changed, 20 insertions(+), 2 deletions(-) > >>> > >> > >> Does not apply to 4.4.y :( > >> > >> Can you provide a working backport for that tree? > >> > > > > Okay. Will do. Thanks. > > > > > Greg, > > I actually found that there are a number of dependent IBPB related patches that haven't been > backported yet to 4.4: > > x86/cpufeatures: Add AMD feature bits for Speculation Control > (cherry picked from commit 5d10cbc91d9eb5537998b65608441b592eec65e7) > > x86/msr: Add definitions for new speculation control MSRs > (cherry picked from commit 1e340c60d0dd3ae07b5bedc16a0469c14b9f3410) > > x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support > (cherry picked from commit 20ffa1caecca4db8f79fe665acdeaa5af815a24d) > > x86/cpufeatures: Clean up Spectre v2 related CPUID flags > (cherry picked from commit 2961298efe1ea1b6fc0d7ee8b76018fa6c0bcef2) > > And probably and a few more. > You have plans to backport these patches? I don't, but I think someone from Amazon was looking into it, but I haven't heard from them in a few weeks. I'll gladly take patches if you have them, or at the worse case, a list like above of the git commits that are missing. thanks, greg k-h