From e9f6376858b9799148d07e58b72b681d4b8fa4c7 Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Thu, 4 Jun 2020 16:46:23 -0700 Subject: arm64: add support for folded p4d page tables Implement primitives necessary for the 4th level folding, add walks of p4d level where appropriate, replace 5level-fixup.h with pgtable-nop4d.h and remove __ARCH_USE_5LEVEL_HACK. [arnd@arndb.de: fix gcc-10 shift warning] Link: http://lkml.kernel.org/r/20200429185657.4085975-1-arnd@arndb.de Signed-off-by: Mike Rapoport Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Brian Cain Cc: Catalin Marinas Cc: Christophe Leroy Cc: Fenghua Yu Cc: Geert Uytterhoeven Cc: Guan Xuetao Cc: James Morse Cc: Jonas Bonn Cc: Julien Thierry Cc: Ley Foon Tan Cc: Marc Zyngier Cc: Michael Ellerman Cc: Paul Mackerras Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Suzuki K Poulose Cc: Tony Luck Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200414153455.21744-4-rppt@kernel.org Signed-off-by: Linus Torvalds --- arch/arm64/mm/kasan_init.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) (limited to 'arch/arm64/mm/kasan_init.c') diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index f87a32484ea8..2339811f317b 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -84,17 +84,17 @@ static pmd_t *__init kasan_pmd_offset(pud_t *pudp, unsigned long addr, int node, return early ? pmd_offset_kimg(pudp, addr) : pmd_offset(pudp, addr); } -static pud_t *__init kasan_pud_offset(pgd_t *pgdp, unsigned long addr, int node, +static pud_t *__init kasan_pud_offset(p4d_t *p4dp, unsigned long addr, int node, bool early) { - if (pgd_none(READ_ONCE(*pgdp))) { + if (p4d_none(READ_ONCE(*p4dp))) { phys_addr_t pud_phys = early ? __pa_symbol(kasan_early_shadow_pud) : kasan_alloc_zeroed_page(node); - __pgd_populate(pgdp, pud_phys, PMD_TYPE_TABLE); + __p4d_populate(p4dp, pud_phys, PMD_TYPE_TABLE); } - return early ? pud_offset_kimg(pgdp, addr) : pud_offset(pgdp, addr); + return early ? pud_offset_kimg(p4dp, addr) : pud_offset(p4dp, addr); } static void __init kasan_pte_populate(pmd_t *pmdp, unsigned long addr, @@ -126,11 +126,11 @@ static void __init kasan_pmd_populate(pud_t *pudp, unsigned long addr, } while (pmdp++, addr = next, addr != end && pmd_none(READ_ONCE(*pmdp))); } -static void __init kasan_pud_populate(pgd_t *pgdp, unsigned long addr, +static void __init kasan_pud_populate(p4d_t *p4dp, unsigned long addr, unsigned long end, int node, bool early) { unsigned long next; - pud_t *pudp = kasan_pud_offset(pgdp, addr, node, early); + pud_t *pudp = kasan_pud_offset(p4dp, addr, node, early); do { next = pud_addr_end(addr, end); @@ -138,6 +138,18 @@ static void __init kasan_pud_populate(pgd_t *pgdp, unsigned long addr, } while (pudp++, addr = next, addr != end && pud_none(READ_ONCE(*pudp))); } +static void __init kasan_p4d_populate(pgd_t *pgdp, unsigned long addr, + unsigned long end, int node, bool early) +{ + unsigned long next; + p4d_t *p4dp = p4d_offset(pgdp, addr); + + do { + next = p4d_addr_end(addr, end); + kasan_pud_populate(p4dp, addr, next, node, early); + } while (p4dp++, addr = next, addr != end); +} + static void __init kasan_pgd_populate(unsigned long addr, unsigned long end, int node, bool early) { @@ -147,7 +159,7 @@ static void __init kasan_pgd_populate(unsigned long addr, unsigned long end, pgdp = pgd_offset_k(addr); do { next = pgd_addr_end(addr, end); - kasan_pud_populate(pgdp, addr, next, node, early); + kasan_p4d_populate(pgdp, addr, next, node, early); } while (pgdp++, addr = next, addr != end); } -- cgit v1.2.3