* Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote: > 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. > > Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> > [kirill.shutemov@xxxxxxxxxxxxxxx: clenaup, changelog message] > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Bad SOB chain. If Andrey the true author of this patch then it be reflected in a "From:" line. > --- > arch/x86/Kconfig | 1 - > arch/x86/kernel/Makefile | 3 +- > arch/x86/mm/kasan_init_64.c | 86 ++++++++++++++++++++++++++++++++++----------- > 3 files changed, 67 insertions(+), 23 deletions(-) This is a lot of complex code added with exactly zero lines of comments that explains all the complexity ... Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
