On Mon, Sep 03, 2018 at 03:59:43PM -0700, Andy Lutomirski wrote: > In the non-trampoline SYSCALL64 path, we use a percpu variable to > temporarily store the user RSP value. Instead of a separate > variable, use the otherwise unused sp2 slot in the TSS. This will > improve cache locality, as the sp1 slot is already used in the same > code to find the kernel stack. It will also simplify a future > change to make the non-trampoline path work in PTI mode. > > Signed-off-by: Andy Lutomirski <[email protected]> > --- > arch/x86/entry/entry_64.S | 16 +++++++++------- > arch/x86/include/asm/processor.h | 6 ++++++ > arch/x86/kernel/asm-offsets.c | 3 ++- > arch/x86/kernel/process_64.c | 2 -- > arch/x86/xen/xen-asm_64.S | 8 +++++--- > 5 files changed, 22 insertions(+), 13 deletions(-)
Reviewed-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.
