linux-stable/Documentation/x86/x86_64
Andrey Ryabinin 12a8cc7fcf x86/kasan: Use the same shadow offset for 4- and 5-level paging
We are going to support boot-time switching between 4- and 5-level
paging. For KASAN it means we cannot have different KASAN_SHADOW_OFFSET
for different paging modes: the constant is passed to gcc to generate
code and cannot be changed at runtime.

This patch changes KASAN code to use 0xdffffc0000000000 as shadow offset
for both 4- and 5-level paging.

For 5-level paging it means that shadow memory region is not aligned to
PGD boundary anymore and we have to handle unaligned parts of the region
properly.

In addition, we have to exclude paravirt code from KASAN instrumentation
as we now use set_pgd() before KASAN is fully ready.

[kirill.shutemov@linux.intel.com: clenaup, changelog message]
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@suse.de>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170929140821.37654-4-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-10-20 13:07:09 +02:00
..
00-INDEX
5level-paging.txt x86: Enable 5-level paging support via CONFIG_X86_5LEVEL=y 2017-07-21 10:05:19 +02:00
boot-options.txt x86/mce: Update bootlog description to reflect behavior on AMD 2017-06-14 07:32:10 +02:00
cpu-hotplug-spec
fake-numa-for-cpusets Documenation: update cgroup's document path 2016-08-03 15:43:58 -06:00
machinecheck x86/Documentation: Fix various typos in Documentation/x86/ files 2016-07-01 10:00:10 +02:00
mm.txt x86/kasan: Use the same shadow offset for 4- and 5-level paging 2017-10-20 13:07:09 +02:00
uefi.txt