On Thu, Jan 18, 2018 at 04:28:26PM +0100, Thomas Gleixner wrote: > The machine check idtentry uses an indirect branch directly from the low > level code. This evades the speculation protection. > > Replace it by a direct call into C code and issue the indirect call there > so the compiler can apply the proper speculation protection. > > Signed-off-by: Thomas Gleixner <t...@linutronix.de> > --- > arch/x86/entry/entry_64.S | 2 +- > arch/x86/include/asm/traps.h | 1 + > arch/x86/kernel/cpu/mcheck/mce.c | 5 +++++ > 3 files changed, 7 insertions(+), 1 deletion(-) > > --- a/arch/x86/entry/entry_64.S > +++ b/arch/x86/entry/entry_64.S > @@ -1264,7 +1264,7 @@ idtentry async_page_fault do_async_page_ > #endif > > #ifdef CONFIG_X86_MCE > -idtentry machine_check > has_error_code=0 paranoid=1 do_sym=*machine_check_vector(%rip) > +idtentry machine_check do_mce > has_error_code=0 paranoid=1
Nice, Thanks!
