On Fri, Nov 24, 2017 at 10:14:16AM +0100, Ingo Molnar wrote: > From: Andy Lutomirski <[email protected]> > > On 64-bit kernels, we used to assume that TSS.sp0 was the current > top of stack. With the addition of an entry trampoline, this will > no longer be the case. Store the current top of stack in TSS.sp1, > which is otherwise unused but shares the same cacheline. > > Signed-off-by: Andy Lutomirski <[email protected]> > Reviewed-by: Thomas Gleixner <[email protected]> > Cc: Borislav Petkov <[email protected]> > Cc: Borislav Petkov <[email protected]> > Cc: Brian Gerst <[email protected]> > Cc: Dave Hansen <[email protected]> > Cc: Denys Vlasenko <[email protected]> > Cc: H. Peter Anvin <[email protected]> > Cc: Josh Poimboeuf <[email protected]> > Cc: Linus Torvalds <[email protected]> > Cc: Peter Zijlstra <[email protected]> > Link: > http://lkml.kernel.org/r/f56634c746a2926eb7bae61e7b80ed51a1940769.1511497875.git.l...@kernel.org > Signed-off-by: Ingo Molnar <[email protected]> > --- > arch/x86/include/asm/processor.h | 18 +++++++++++++----- > arch/x86/include/asm/thread_info.h | 2 +- > arch/x86/kernel/asm-offsets_64.c | 1 + > arch/x86/kernel/process.c | 10 ++++++++++ > arch/x86/kernel/process_64.c | 1 + > 5 files changed, 26 insertions(+), 6 deletions(-)
Reviewed-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.
