linux-kernel - Re: [PATCH v4 2/7] mm: kasan: introduce generic kasan_populate_zero

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Message-ID: <87mvxzptqv.fsf@linux.vnet.ibm.com>
Date:	Mon, 10 Aug 2015 11:31:12 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel@...ts.infradead.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	David Keitel <dkeitel@...eaurora.org>,
	Alexander Potapenko <glider@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Vyukov <dvyukov@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Alexey Klimov <klimov.linux@...il.com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: Re: [PATCH v4 2/7] mm: kasan: introduce generic kasan_populate_zero_shadow()

Andrey Ryabinin <a.ryabinin@...sung.com> writes:

> Introduce generic kasan_populate_zero_shadow(start, end).
> This function maps kasan_zero_page to the [start, end] addresses.
>
> In follow on patches it will be used for ARMv8 (and maybe other
> architectures) and will replace x86_64 specific populate_zero_shadow().
>
> Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>

This assume that we can have shared pgtable_t in generic code ? Is that
true for generic code ? Even if it is we may want to allow some arch to
override this ? On ppc64, we store the hardware hash page table slot
number in pte_t, Hence we won't be able to share pgtable_t. 



> ---
>  arch/x86/mm/kasan_init_64.c |  14 ----
>  include/linux/kasan.h       |   8 +++
>  mm/kasan/Makefile           |   2 +-
>  mm/kasan/kasan_init.c       | 151 ++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 160 insertions(+), 15 deletions(-)
>  create mode 100644 mm/kasan/kasan_init.c
>
> diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
> index e1840f3..812086c 100644
> --- a/arch/x86/mm/kasan_init_64.c
> +++ b/arch/x86/mm/kasan_init_64.c
> @@ -12,20 +12,6 @@
>  extern pgd_t early_level4_pgt[PTRS_PER_PGD];
>  extern struct range pfn_mapped[E820_X_MAX];
>  
> -static pud_t kasan_zero_pud[PTRS_PER_PUD] __page_aligned_bss;
> -static pmd_t kasan_zero_pmd[PTRS_PER_PMD] __page_aligned_bss;
> -static pte_t kasan_zero_pte[PTRS_PER_PTE] __page_aligned_bss;
> -
> -/*

-aneesh

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