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Date: Wed, 19 Feb 2020 13:07:55 +0100
From: Christophe Leroy <christophe.leroy@....fr>
To: Mike Rapoport <rppt@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Brian Cain <bcain@...eaurora.org>,
Catalin Marinas <catalin.marinas@....com>,
Fenghua Yu <fenghua.yu@...el.com>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Guan Xuetao <gxt@....edu.cn>,
James Morse <james.morse@....com>,
Jonas Bonn <jonas@...thpole.se>,
Julien Thierry <julien.thierry.kdev@...il.com>,
Ley Foon Tan <ley.foon.tan@...el.com>,
Marc Zyngier <maz@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Paul Mackerras <paulus@...ba.org>,
Rich Felker <dalias@...c.org>,
Russell King <linux@...linux.org.uk>,
Stafford Horne <shorne@...il.com>,
Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
Suzuki K Poulose <suzuki.poulose@....com>,
Tony Luck <tony.luck@...el.com>, Will Deacon <will@...nel.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
kvmarm@...ts.cs.columbia.edu, kvm-ppc@...r.kernel.org,
linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
linux-sh@...r.kernel.org, nios2-dev@...ts.rocketboards.org,
openrisc@...ts.librecores.org,
uclinux-h8-devel@...ts.sourceforge.jp,
Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH v2 07/13] powerpc: add support for folded p4d page tables
Le 16/02/2020 à 09:18, Mike Rapoport a écrit :
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> Implement primitives necessary for the 4th level folding, add walks of p4d
> level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h.
>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> Tested-by: Christophe Leroy <christophe.leroy@....fr> # 8xx and 83xx
> ---
> arch/powerpc/include/asm/book3s/32/pgtable.h | 1 -
> arch/powerpc/include/asm/book3s/64/hash.h | 4 +-
> arch/powerpc/include/asm/book3s/64/pgalloc.h | 4 +-
> arch/powerpc/include/asm/book3s/64/pgtable.h | 58 ++++++++++--------
> arch/powerpc/include/asm/book3s/64/radix.h | 6 +-
> arch/powerpc/include/asm/nohash/32/pgtable.h | 1 -
> arch/powerpc/include/asm/nohash/64/pgalloc.h | 2 +-
> .../include/asm/nohash/64/pgtable-4k.h | 32 +++++-----
> arch/powerpc/include/asm/nohash/64/pgtable.h | 6 +-
> arch/powerpc/include/asm/pgtable.h | 8 +++
> arch/powerpc/kvm/book3s_64_mmu_radix.c | 59 ++++++++++++++++---
> arch/powerpc/lib/code-patching.c | 7 ++-
> arch/powerpc/mm/book3s32/mmu.c | 2 +-
> arch/powerpc/mm/book3s32/tlb.c | 4 +-
> arch/powerpc/mm/book3s64/hash_pgtable.c | 4 +-
> arch/powerpc/mm/book3s64/radix_pgtable.c | 19 ++++--
> arch/powerpc/mm/book3s64/subpage_prot.c | 6 +-
> arch/powerpc/mm/hugetlbpage.c | 28 +++++----
> arch/powerpc/mm/kasan/kasan_init_32.c | 8 +--
> arch/powerpc/mm/mem.c | 4 +-
> arch/powerpc/mm/nohash/40x.c | 4 +-
> arch/powerpc/mm/nohash/book3e_pgtable.c | 15 +++--
> arch/powerpc/mm/pgtable.c | 25 +++++++-
> arch/powerpc/mm/pgtable_32.c | 28 +++++----
> arch/powerpc/mm/pgtable_64.c | 10 ++--
> arch/powerpc/mm/ptdump/hashpagetable.c | 20 ++++++-
> arch/powerpc/mm/ptdump/ptdump.c | 22 ++++++-
> arch/powerpc/xmon/xmon.c | 17 +++++-
> 28 files changed, 284 insertions(+), 120 deletions(-)
>
> diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c
> index 206156255247..7bd4b81d5b5d 100644
> --- a/arch/powerpc/mm/ptdump/ptdump.c
> +++ b/arch/powerpc/mm/ptdump/ptdump.c
> @@ -277,9 +277,9 @@ static void walk_pmd(struct pg_state *st, pud_t *pud, unsigned long start)
> }
> }
>
> -static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
> +static void walk_pud(struct pg_state *st, p4d_t *p4d, unsigned long start)
> {
> - pud_t *pud = pud_offset(pgd, 0);
> + pud_t *pud = pud_offset(p4d, 0);
> unsigned long addr;
> unsigned int i;
>
> @@ -293,6 +293,22 @@ static void walk_pud(struct pg_state *st, pgd_t *pgd, unsigned long start)
> }
> }
>
> +static void walk_p4d(struct pg_state *st, pgd_t *pgd, unsigned long start)
> +{
> + p4d_t *p4d = p4d_offset(pgd, 0);
> + unsigned long addr;
> + unsigned int i;
> +
> + for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {
> + addr = start + i * P4D_SIZE;
> + if (!p4d_none(*p4d) && !p4d_is_leaf(*p4d))
> + /* p4d exists */
> + walk_pud(st, p4d, addr);
> + else
> + note_page(st, addr, 2, p4d_val(*p4d));
Level 2 is already used by walk_pud().
I think you have to increment the level used in walk_pud() and
walk_pmd() and walk_pte()
> + }
> +}
> +
> static void walk_pagetables(struct pg_state *st)
> {
> unsigned int i;
> @@ -306,7 +322,7 @@ static void walk_pagetables(struct pg_state *st)
> for (i = pgd_index(addr); i < PTRS_PER_PGD; i++, pgd++, addr += PGDIR_SIZE) {
> if (!pgd_none(*pgd) && !pgd_is_leaf(*pgd))
> /* pgd exists */
> - walk_pud(st, pgd, addr);
> + walk_p4d(st, pgd, addr);
> else
> note_page(st, addr, 1, pgd_val(*pgd));
> }
Christophe
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