diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-04-14 17:59:56 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-04-17 15:05:32 +0200 |
| commit | 1bdb67e5aa2d5d43c48cb7d93393fcba276c9e71 (patch) | |
| tree | 871ff0cb4efb160ba8ecf9f82c2cc977659abf9d /arch/x86 | |
| parent | 3207426925d2b4da390be8068df1d1c2b36e5918 (diff) | |
| download | linux-1bdb67e5aa2d5d43c48cb7d93393fcba276c9e71.tar.bz2 | |
x86/exceptions: Enable IST guard pages
All usage sites which expected that the exception stacks in the CPU entry
area are mapped linearly are fixed up. Enable guard pages between the
IST stacks.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190414160145.349862042@linutronix.de
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/cpu_entry_area.h | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/arch/x86/include/asm/cpu_entry_area.h b/arch/x86/include/asm/cpu_entry_area.h index 310eeb62d418..9c96406e6d2b 100644 --- a/arch/x86/include/asm/cpu_entry_area.h +++ b/arch/x86/include/asm/cpu_entry_area.h @@ -26,13 +26,9 @@ struct exception_stacks { ESTACKS_MEMBERS(0) }; -/* - * The effective cpu entry area mapping with guard pages. Guard size is - * zero until the code which makes assumptions about linear mappings is - * cleaned up. - */ +/* The effective cpu entry area mapping with guard pages. */ struct cea_exception_stacks { - ESTACKS_MEMBERS(0) + ESTACKS_MEMBERS(PAGE_SIZE) }; /* |