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? Tim