On Wed, Oct 14, 2015 at 12:20:27PM +0100, Suzuki K. Poulose wrote: > Now that we can calculate the number of levels required for > mapping a va width, reserve exact number of pages that would > be required to cover the idmap. The idmap should be able to handle > the maximum physical address size supported. > > Cc: Ard Biesheuvel <ard.biesheu...@linaro.org> > Cc: Mark Rutland <mark.rutl...@arm.com> > Cc: Catalin Marinas <catalin.mari...@arm.com> > Cc: Will Deacon <will.dea...@arm.com> > Signed-off-by: Suzuki K. Poulose <suzuki.poul...@arm.com> > Reviewed-by: Ard Biesheuvel <ard.biesheu...@linaro.org> > Tested-by: Ard Biesheuvel <ard.biesheu...@linaro.org> > --- > arch/arm64/include/asm/kernel-pgtable.h | 7 +++++-- > 1 file changed, 5 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/include/asm/kernel-pgtable.h > b/arch/arm64/include/asm/kernel-pgtable.h > index 5876a36..def7168 100644 > --- a/arch/arm64/include/asm/kernel-pgtable.h > +++ b/arch/arm64/include/asm/kernel-pgtable.h > @@ -33,16 +33,19 @@ > * map to pte level. The swapper also maps the FDT (see __create_page_tables > * for more information). Note that the number of ID map translation levels > * could be increased on the fly if system RAM is out of reach for the > default > - * VA range, so 3 pages are reserved in all cases. > + * VA range, so pages required to map highest possible PA are reserved in all > + * cases. > */ > #if ARM64_SWAPPER_USES_SECTION_MAPS > #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS - 1) > +#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT) - 1) > #else > #define SWAPPER_PGTABLE_LEVELS (CONFIG_PGTABLE_LEVELS) > +#define IDMAP_PGTABLE_LEVELS (ARM64_HW_PGTABLE_LEVELS(PHYS_MASK_SHIFT)) > #endif > > #define SWAPPER_DIR_SIZE (SWAPPER_PGTABLE_LEVELS * PAGE_SIZE) > -#define IDMAP_DIR_SIZE (3 * PAGE_SIZE) > +#define IDMAP_DIR_SIZE (IDMAP_PGTABLE_LEVELS * PAGE_SIZE)
Acked-by: Mark Rutland <mark.rutl...@arm.com> Thanks, Mark. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
