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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 26 Feb 2020 09:13:21 -0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01Q9DLD463570076 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 26 Feb 2020 09:13:21 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DA2D9AE056; Wed, 26 Feb 2020 09:13:20 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7EE18AE051; Wed, 26 Feb 2020 09:13:17 +0000 (GMT) Received: from hump (unknown [9.148.207.76]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 26 Feb 2020 09:13:17 +0000 (GMT) Date: Wed, 26 Feb 2020 11:13:15 +0200 From: Mike Rapoport To: Christophe Leroy Cc: linux-kernel@vger.kernel.org, Andrew Morton , Arnd Bergmann , Benjamin Herrenschmidt , Brian Cain , Catalin Marinas , Fenghua Yu , Geert Uytterhoeven , Guan Xuetao , James Morse , Jonas Bonn , Julien Thierry , Ley Foon Tan , Marc Zyngier , Michael Ellerman , Paul Mackerras , Rich Felker , Russell King , Stafford Horne , Stefan Kristiansson , Suzuki K Poulose , Tony Luck , Will Deacon , Yoshinori Sato , kvmarm@lists.cs.columbia.edu, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org, nios2-dev@lists.rocketboards.org, openrisc@lists.librecores.org, uclinux-h8-devel@lists.sourceforge.jp, Mike Rapoport Subject: Re: [PATCH v2 07/13] powerpc: add support for folded p4d page tables References: <20200216081843.28670-1-rppt@kernel.org> <20200216081843.28670-8-rppt@kernel.org> <20200218105440.GA1698@hump> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200218105440.GA1698@hump> X-TM-AS-GCONF: 00 x-cbid: 20022609-0016-0000-0000-000002EA5F05 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20022609-0017-0000-0000-0000334D8D9E Message-Id: <20200226091315.GA11803@hump> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-26_02:2020-02-25,2020-02-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 spamscore=0 bulkscore=0 phishscore=0 suspectscore=7 mlxlogscore=999 adultscore=0 impostorscore=0 clxscore=1011 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002260070 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 18, 2020 at 12:54:40PM +0200, Mike Rapoport wrote: > On Sun, Feb 16, 2020 at 11:41:07AM +0100, Christophe Leroy wrote: > > > > > > Le 16/02/2020 ? 09:18, Mike Rapoport a ?crit?: > > > From: Mike Rapoport > > > > > > Implement primitives necessary for the 4th level folding, add walks of p4d > > > level where appropriate and replace 5level-fixup.h with pgtable-nop4d.h. > > > > I don't think it is worth adding all this additionnals walks of p4d, this > > patch could be limited to changes like: > > > > - pud = pud_offset(pgd, gpa); > > + pud = pud_offset(p4d_offset(pgd, gpa), gpa); > > > > The additionnal walks should be added through another patch the day powerpc > > need them. > > Ok, I'll update the patch to reduce walking the p4d. Here's what I have with more direct acceses from pgd to pud. From 6c59a86ce8394fb6100e9b6ced2e346981fb0ce9 Mon Sep 17 00:00:00 2001 From: Mike Rapoport Date: Sun, 24 Nov 2019 15:38:00 +0200 Subject: [PATCH v3] powerpc: add support for folded p4d page tables 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 Tested-by: Christophe Leroy # 8xx and 83xx --- v3: * reduce amount of added p4d walks * kill pgtable_32::get_pteptr and traverse page table in pgtable_32::__change_page_attr_noflush 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 | 60 ++++++++++--------- 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 | 6 +- arch/powerpc/kvm/book3s_64_mmu_radix.c | 30 ++++++---- 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 | 26 +++++--- 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 | 30 ++++++---- arch/powerpc/mm/pgtable_32.c | 45 +++----------- arch/powerpc/mm/pgtable_64.c | 10 ++-- arch/powerpc/mm/ptdump/hashpagetable.c | 20 ++++++- arch/powerpc/mm/ptdump/ptdump.c | 14 +++-- arch/powerpc/xmon/xmon.c | 18 +++--- 28 files changed, 213 insertions(+), 184 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h index 5b39c11e884a..39ec11371be0 100644 --- a/arch/powerpc/include/asm/book3s/32/pgtable.h +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h @@ -2,7 +2,6 @@ #ifndef _ASM_POWERPC_BOOK3S_32_PGTABLE_H #define _ASM_POWERPC_BOOK3S_32_PGTABLE_H -#define __ARCH_USE_5LEVEL_HACK #include #include diff --git a/arch/powerpc/include/asm/book3s/64/hash.h b/arch/powerpc/include/asm/book3s/64/hash.h index 2781ebf6add4..876d1528c2cf 100644 --- a/arch/powerpc/include/asm/book3s/64/hash.h +++ b/arch/powerpc/include/asm/book3s/64/hash.h @@ -134,9 +134,9 @@ static inline int get_region_id(unsigned long ea) #define hash__pmd_bad(pmd) (pmd_val(pmd) & H_PMD_BAD_BITS) #define hash__pud_bad(pud) (pud_val(pud) & H_PUD_BAD_BITS) -static inline int hash__pgd_bad(pgd_t pgd) +static inline int hash__p4d_bad(p4d_t p4d) { - return (pgd_val(pgd) == 0); + return (p4d_val(p4d) == 0); } #ifdef CONFIG_STRICT_KERNEL_RWX extern void hash__mark_rodata_ro(void); diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h index a41e91bd0580..69c5b051734f 100644 --- a/arch/powerpc/include/asm/book3s/64/pgalloc.h +++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h @@ -85,9 +85,9 @@ static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); } -static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) +static inline void p4d_populate(struct mm_struct *mm, p4d_t *pgd, pud_t *pud) { - *pgd = __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS); + *pgd = __p4d(__pgtable_ptr_val(pud) | PGD_VAL_BITS); } static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 201a69e6a355..fa60e8594b9f 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -2,7 +2,7 @@ #ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ #define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ -#include +#include #ifndef __ASSEMBLY__ #include @@ -251,7 +251,7 @@ extern unsigned long __pmd_frag_size_shift; /* Bits to mask out from a PUD to get to the PMD page */ #define PUD_MASKED_BITS 0xc0000000000000ffUL /* Bits to mask out from a PGD to get to the PUD page */ -#define PGD_MASKED_BITS 0xc0000000000000ffUL +#define P4D_MASKED_BITS 0xc0000000000000ffUL /* * Used as an indicator for rcu callback functions @@ -949,54 +949,60 @@ static inline bool pud_access_permitted(pud_t pud, bool write) return pte_access_permitted(pud_pte(pud), write); } -#define pgd_write(pgd) pte_write(pgd_pte(pgd)) +#define __p4d_raw(x) ((p4d_t) { __pgd_raw(x) }) +static inline __be64 p4d_raw(p4d_t x) +{ + return pgd_raw(x.pgd); +} + +#define p4d_write(p4d) pte_write(p4d_pte(p4d)) -static inline void pgd_clear(pgd_t *pgdp) +static inline void p4d_clear(p4d_t *p4dp) { - *pgdp = __pgd(0); + *p4dp = __p4d(0); } -static inline int pgd_none(pgd_t pgd) +static inline int p4d_none(p4d_t p4d) { - return !pgd_raw(pgd); + return !p4d_raw(p4d); } -static inline int pgd_present(pgd_t pgd) +static inline int p4d_present(p4d_t p4d) { - return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PRESENT)); + return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PRESENT)); } -static inline pte_t pgd_pte(pgd_t pgd) +static inline pte_t p4d_pte(p4d_t p4d) { - return __pte_raw(pgd_raw(pgd)); + return __pte_raw(p4d_raw(p4d)); } -static inline pgd_t pte_pgd(pte_t pte) +static inline p4d_t pte_p4d(pte_t pte) { - return __pgd_raw(pte_raw(pte)); + return __p4d_raw(pte_raw(pte)); } -static inline int pgd_bad(pgd_t pgd) +static inline int p4d_bad(p4d_t p4d) { if (radix_enabled()) - return radix__pgd_bad(pgd); - return hash__pgd_bad(pgd); + return radix__p4d_bad(p4d); + return hash__p4d_bad(p4d); } -#define pgd_access_permitted pgd_access_permitted -static inline bool pgd_access_permitted(pgd_t pgd, bool write) +#define p4d_access_permitted p4d_access_permitted +static inline bool p4d_access_permitted(p4d_t p4d, bool write) { - return pte_access_permitted(pgd_pte(pgd), write); + return pte_access_permitted(p4d_pte(p4d), write); } -extern struct page *pgd_page(pgd_t pgd); +extern struct page *p4d_page(p4d_t p4d); /* Pointers in the page table tree are physical addresses */ #define __pgtable_ptr_val(ptr) __pa(ptr) #define pmd_page_vaddr(pmd) __va(pmd_val(pmd) & ~PMD_MASKED_BITS) #define pud_page_vaddr(pud) __va(pud_val(pud) & ~PUD_MASKED_BITS) -#define pgd_page_vaddr(pgd) __va(pgd_val(pgd) & ~PGD_MASKED_BITS) +#define p4d_page_vaddr(p4d) __va(p4d_val(p4d) & ~P4D_MASKED_BITS) #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1)) #define pud_index(address) (((address) >> (PUD_SHIFT)) & (PTRS_PER_PUD - 1)) @@ -1010,8 +1016,8 @@ extern struct page *pgd_page(pgd_t pgd); #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) -#define pud_offset(pgdp, addr) \ - (((pud_t *) pgd_page_vaddr(*(pgdp))) + pud_index(addr)) +#define pud_offset(p4dp, addr) \ + (((pud_t *) p4d_page_vaddr(*(p4dp))) + pud_index(addr)) #define pmd_offset(pudp,addr) \ (((pmd_t *) pud_page_vaddr(*(pudp))) + pmd_index(addr)) #define pte_offset_kernel(dir,addr) \ @@ -1368,11 +1374,11 @@ static inline bool pud_is_leaf(pud_t pud) return !!(pud_raw(pud) & cpu_to_be64(_PAGE_PTE)); } -#define pgd_is_leaf pgd_is_leaf -#define pgd_leaf pgd_is_leaf -static inline bool pgd_is_leaf(pgd_t pgd) +#define p4d_is_leaf p4d_is_leaf +#define p4d_leaf p4d_is_leaf +static inline bool p4d_is_leaf(p4d_t p4d) { - return !!(pgd_raw(pgd) & cpu_to_be64(_PAGE_PTE)); + return !!(p4d_raw(p4d) & cpu_to_be64(_PAGE_PTE)); } #endif /* __ASSEMBLY__ */ diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h index d97db3ad9aae..9bca2ac64220 100644 --- a/arch/powerpc/include/asm/book3s/64/radix.h +++ b/arch/powerpc/include/asm/book3s/64/radix.h @@ -30,7 +30,7 @@ /* Don't have anything in the reserved bits and leaf bits */ #define RADIX_PMD_BAD_BITS 0x60000000000000e0UL #define RADIX_PUD_BAD_BITS 0x60000000000000e0UL -#define RADIX_PGD_BAD_BITS 0x60000000000000e0UL +#define RADIX_P4D_BAD_BITS 0x60000000000000e0UL #define RADIX_PMD_SHIFT (PAGE_SHIFT + RADIX_PTE_INDEX_SIZE) #define RADIX_PUD_SHIFT (RADIX_PMD_SHIFT + RADIX_PMD_INDEX_SIZE) @@ -227,9 +227,9 @@ static inline int radix__pud_bad(pud_t pud) } -static inline int radix__pgd_bad(pgd_t pgd) +static inline int radix__p4d_bad(p4d_t p4d) { - return !!(pgd_val(pgd) & RADIX_PGD_BAD_BITS); + return !!(p4d_val(p4d) & RADIX_P4D_BAD_BITS); } #ifdef CONFIG_TRANSPARENT_HUGEPAGE diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h index 60c4d829152e..d4c2c4259fa3 100644 --- a/arch/powerpc/include/asm/nohash/32/pgtable.h +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h @@ -2,7 +2,6 @@ #ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H #define _ASM_POWERPC_NOHASH_32_PGTABLE_H -#define __ARCH_USE_5LEVEL_HACK #include #ifndef __ASSEMBLY__ diff --git a/arch/powerpc/include/asm/nohash/64/pgalloc.h b/arch/powerpc/include/asm/nohash/64/pgalloc.h index b9534a793293..668aee6017e7 100644 --- a/arch/powerpc/include/asm/nohash/64/pgalloc.h +++ b/arch/powerpc/include/asm/nohash/64/pgalloc.h @@ -15,7 +15,7 @@ struct vmemmap_backing { }; extern struct vmemmap_backing *vmemmap_list; -#define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD) +#define p4d_populate(MM, P4D, PUD) p4d_set(P4D, (unsigned long)PUD) static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) { diff --git a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h index c40ec32b8194..81b1c54e3cf1 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable-4k.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable-4k.h @@ -2,7 +2,7 @@ #ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H #define _ASM_POWERPC_NOHASH_64_PGTABLE_4K_H -#include +#include /* * Entries per page directory level. The PTE level must use a 64b record @@ -45,41 +45,41 @@ #define PMD_MASKED_BITS 0 /* Bits to mask out from a PUD to get to the PMD page */ #define PUD_MASKED_BITS 0 -/* Bits to mask out from a PGD to get to the PUD page */ -#define PGD_MASKED_BITS 0 +/* Bits to mask out from a P4D to get to the PUD page */ +#define P4D_MASKED_BITS 0 /* * 4-level page tables related bits */ -#define pgd_none(pgd) (!pgd_val(pgd)) -#define pgd_bad(pgd) (pgd_val(pgd) == 0) -#define pgd_present(pgd) (pgd_val(pgd) != 0) -#define pgd_page_vaddr(pgd) (pgd_val(pgd) & ~PGD_MASKED_BITS) +#define p4d_none(p4d) (!p4d_val(p4d)) +#define p4d_bad(p4d) (p4d_val(p4d) == 0) +#define p4d_present(p4d) (p4d_val(p4d) != 0) +#define p4d_page_vaddr(p4d) (p4d_val(p4d) & ~P4D_MASKED_BITS) #ifndef __ASSEMBLY__ -static inline void pgd_clear(pgd_t *pgdp) +static inline void p4d_clear(p4d_t *p4dp) { - *pgdp = __pgd(0); + *p4dp = __p4d(0); } -static inline pte_t pgd_pte(pgd_t pgd) +static inline pte_t p4d_pte(p4d_t p4d) { - return __pte(pgd_val(pgd)); + return __pte(p4d_val(p4d)); } -static inline pgd_t pte_pgd(pte_t pte) +static inline p4d_t pte_p4d(pte_t pte) { - return __pgd(pte_val(pte)); + return __p4d(pte_val(pte)); } -extern struct page *pgd_page(pgd_t pgd); +extern struct page *p4d_page(p4d_t p4d); #endif /* !__ASSEMBLY__ */ -#define pud_offset(pgdp, addr) \ - (((pud_t *) pgd_page_vaddr(*(pgdp))) + \ +#define pud_offset(p4dp, addr) \ + (((pud_t *) p4d_page_vaddr(*(p4dp))) + \ (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))) #define pud_ERROR(e) \ diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index 9a33b8bd842d..b360f262b9c6 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -175,11 +175,11 @@ static inline pud_t pte_pud(pte_t pte) return __pud(pte_val(pte)); } #define pud_write(pud) pte_write(pud_pte(pud)) -#define pgd_write(pgd) pte_write(pgd_pte(pgd)) +#define p4d_write(pgd) pte_write(p4d_pte(p4d)) -static inline void pgd_set(pgd_t *pgdp, unsigned long val) +static inline void p4d_set(p4d_t *p4dp, unsigned long val) { - *pgdp = __pgd(val); + *p4dp = __p4d(val); } /* diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 8cc543ed114c..05205d7a7b4a 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -139,9 +139,9 @@ static inline bool pud_is_leaf(pud_t pud) } #endif -#ifndef pgd_is_leaf -#define pgd_is_leaf pgd_is_leaf -static inline bool pgd_is_leaf(pgd_t pgd) +#ifndef p4d_is_leaf +#define p4d_is_leaf p4d_is_leaf +static inline bool p4d_is_leaf(p4d_t p4d) { return false; } diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index 803940d79b73..beb694285100 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -499,13 +499,14 @@ void kvmppc_free_pgtable_radix(struct kvm *kvm, pgd_t *pgd, unsigned int lpid) unsigned long ig; for (ig = 0; ig < PTRS_PER_PGD; ++ig, ++pgd) { + p4d_t *p4d = p4d_offset(pgd, 0); pud_t *pud; - if (!pgd_present(*pgd)) + if (!p4d_present(*p4d)) continue; - pud = pud_offset(pgd, 0); + pud = pud_offset(p4d, 0); kvmppc_unmap_free_pud(kvm, pud, lpid); - pgd_clear(pgd); + p4d_clear(p4d); } } @@ -566,6 +567,7 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, unsigned long *rmapp, struct rmap_nested **n_rmap) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud, *new_pud = NULL; pmd_t *pmd, *new_pmd = NULL; pte_t *ptep, *new_ptep = NULL; @@ -573,9 +575,11 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, /* Traverse the guest's 2nd-level tree, allocate new levels needed */ pgd = pgtable + pgd_index(gpa); + p4d = p4d_offset(pgd, gpa); + pud = NULL; - if (pgd_present(*pgd)) - pud = pud_offset(pgd, gpa); + if (p4d_present(*p4d)) + pud = pud_offset(p4d, gpa); else new_pud = pud_alloc_one(kvm->mm, gpa); @@ -596,13 +600,13 @@ int kvmppc_create_pte(struct kvm *kvm, pgd_t *pgtable, pte_t pte, /* Now traverse again under the lock and change the tree */ ret = -ENOMEM; - if (pgd_none(*pgd)) { + if (p4d_none(*p4d)) { if (!new_pud) goto out_unlock; - pgd_populate(kvm->mm, pgd, new_pud); + p4d_populate(kvm->mm, p4d, new_pud); new_pud = NULL; } - pud = pud_offset(pgd, gpa); + pud = pud_offset(p4d, gpa); if (pud_is_leaf(*pud)) { unsigned long hgpa = gpa & PUD_MASK; @@ -1220,6 +1224,7 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf, pgd_t *pgt; struct kvm_nested_guest *nested; pgd_t pgd, *pgdp; + p4d_t p4d, *p4dp; pud_t pud, *pudp; pmd_t pmd, *pmdp; pte_t *ptep; @@ -1292,13 +1297,14 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf, } pgdp = pgt + pgd_index(gpa); - pgd = READ_ONCE(*pgdp); - if (!(pgd_val(pgd) & _PAGE_PRESENT)) { - gpa = (gpa & PGDIR_MASK) + PGDIR_SIZE; + p4dp = p4d_offset(pgdp, gpa); + p4d = READ_ONCE(*p4dp); + if (!(p4d_val(p4d) & _PAGE_PRESENT)) { + gpa = (gpa & P4D_MASK) + P4D_SIZE; continue; } - pudp = pud_offset(&pgd, gpa); + pudp = pud_offset(&p4d, gpa); pud = READ_ONCE(*pudp); if (!(pud_val(pud) & _PAGE_PRESENT)) { gpa = (gpa & PUD_MASK) + PUD_SIZE; diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index 3345f039a876..7a59f6863cec 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -107,13 +107,18 @@ static inline int unmap_patch_area(unsigned long addr) pte_t *ptep; pmd_t *pmdp; pud_t *pudp; + p4d_t *p4dp; pgd_t *pgdp; pgdp = pgd_offset_k(addr); if (unlikely(!pgdp)) return -EINVAL; - pudp = pud_offset(pgdp, addr); + p4dp = p4d_offset(pgdp, addr); + if (unlikely(!p4dp)) + return -EINVAL; + + pudp = pud_offset(p4dp, addr); if (unlikely(!pudp)) return -EINVAL; diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c index f888cbb109b9..edef17c97206 100644 --- a/arch/powerpc/mm/book3s32/mmu.c +++ b/arch/powerpc/mm/book3s32/mmu.c @@ -312,7 +312,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea) if (!Hash) return; - pmd = pmd_offset(pud_offset(pgd_offset(mm, ea), ea), ea); + pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, ea), ea), ea), ea); if (!pmd_none(*pmd)) add_hash_page(mm->context.id, ea, pmd_val(*pmd)); } diff --git a/arch/powerpc/mm/book3s32/tlb.c b/arch/powerpc/mm/book3s32/tlb.c index 2fcd321040ff..175bc33b41b7 100644 --- a/arch/powerpc/mm/book3s32/tlb.c +++ b/arch/powerpc/mm/book3s32/tlb.c @@ -87,7 +87,7 @@ static void flush_range(struct mm_struct *mm, unsigned long start, if (start >= end) return; end = (end - 1) | ~PAGE_MASK; - pmd = pmd_offset(pud_offset(pgd_offset(mm, start), start), start); + pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, start), start), start), start); for (;;) { pmd_end = ((start + PGDIR_SIZE) & PGDIR_MASK) - 1; if (pmd_end > end) @@ -145,7 +145,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr) return; } mm = (vmaddr < TASK_SIZE)? vma->vm_mm: &init_mm; - pmd = pmd_offset(pud_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr); + pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset(mm, vmaddr), vmaddr), vmaddr), vmaddr); if (!pmd_none(*pmd)) flush_hash_pages(mm->context.id, vmaddr, pmd_val(*pmd), 1); } diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c index 64733b9cb20a..9cd15937e88a 100644 --- a/arch/powerpc/mm/book3s64/hash_pgtable.c +++ b/arch/powerpc/mm/book3s64/hash_pgtable.c @@ -148,6 +148,7 @@ void hash__vmemmap_remove_mapping(unsigned long start, int hash__map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) { pgd_t *pgdp; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; @@ -155,7 +156,8 @@ int hash__map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) BUILD_BUG_ON(TASK_SIZE_USER64 > H_PGTABLE_RANGE); if (slab_is_available()) { pgdp = pgd_offset_k(ea); - pudp = pud_alloc(&init_mm, pgdp, ea); + p4dp = p4d_offset(pgdp, ea); + pudp = pud_alloc(&init_mm, p4dp, ea); if (!pudp) return -ENOMEM; pmdp = pmd_alloc(&init_mm, pudp, ea); diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c index dd1bea45325c..fc3d0b0460b0 100644 --- a/arch/powerpc/mm/book3s64/radix_pgtable.c +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c @@ -64,17 +64,19 @@ static int early_map_kernel_page(unsigned long ea, unsigned long pa, { unsigned long pfn = pa >> PAGE_SHIFT; pgd_t *pgdp; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; pgdp = pgd_offset_k(ea); - if (pgd_none(*pgdp)) { + p4dp = p4d_offset(pgdp, ea); + if (p4d_none(*p4dp)) { pudp = early_alloc_pgtable(PUD_TABLE_SIZE, nid, region_start, region_end); - pgd_populate(&init_mm, pgdp, pudp); + p4d_populate(&init_mm, p4dp, pudp); } - pudp = pud_offset(pgdp, ea); + pudp = pud_offset(p4dp, ea); if (map_page_size == PUD_SIZE) { ptep = (pte_t *)pudp; goto set_the_pte; @@ -114,6 +116,7 @@ static int __map_kernel_page(unsigned long ea, unsigned long pa, { unsigned long pfn = pa >> PAGE_SHIFT; pgd_t *pgdp; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; @@ -136,7 +139,8 @@ static int __map_kernel_page(unsigned long ea, unsigned long pa, * boot. */ pgdp = pgd_offset_k(ea); - pudp = pud_alloc(&init_mm, pgdp, ea); + p4dp = p4d_offset(pgdp, ea); + pudp = pud_alloc(&init_mm, p4dp, ea); if (!pudp) return -ENOMEM; if (map_page_size == PUD_SIZE) { @@ -173,6 +177,7 @@ void radix__change_memory_range(unsigned long start, unsigned long end, { unsigned long idx; pgd_t *pgdp; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; @@ -185,7 +190,8 @@ void radix__change_memory_range(unsigned long start, unsigned long end, for (idx = start; idx < end; idx += PAGE_SIZE) { pgdp = pgd_offset_k(idx); - pudp = pud_alloc(&init_mm, pgdp, idx); + p4dp = p4d_offset(pgdp, idx); + pudp = pud_alloc(&init_mm, p4dp, idx); if (!pudp) continue; if (pud_is_leaf(*pudp)) { @@ -847,6 +853,7 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end) unsigned long addr, next; pud_t *pud_base; pgd_t *pgd; + p4d_t *p4d; spin_lock(&init_mm.page_table_lock); @@ -854,15 +861,16 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end) next = pgd_addr_end(addr, end); pgd = pgd_offset_k(addr); - if (!pgd_present(*pgd)) + p4d = p4d_offset(pgd, addr); + if (!p4d_present(*p4d)) continue; - if (pgd_is_leaf(*pgd)) { - split_kernel_mapping(addr, end, PGDIR_SIZE, (pte_t *)pgd); + if (p4d_is_leaf(*p4d)) { + split_kernel_mapping(addr, end, P4D_SIZE, (pte_t *)p4d); continue; } - pud_base = (pud_t *)pgd_page_vaddr(*pgd); + pud_base = (pud_t *)p4d_page_vaddr(*p4d); remove_pud_table(pud_base, addr, next); } diff --git a/arch/powerpc/mm/book3s64/subpage_prot.c b/arch/powerpc/mm/book3s64/subpage_prot.c index 2ef24a53f4c9..25a0c044bd93 100644 --- a/arch/powerpc/mm/book3s64/subpage_prot.c +++ b/arch/powerpc/mm/book3s64/subpage_prot.c @@ -54,15 +54,17 @@ static void hpte_flush_range(struct mm_struct *mm, unsigned long addr, int npages) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; spinlock_t *ptl; pgd = pgd_offset(mm, addr); - if (pgd_none(*pgd)) + p4d = p4d_offset(pgd, addr); + if (p4d_none(*p4d)) return; - pud = pud_offset(pgd, addr); + pud = pud_offset(p4d, addr); if (pud_none(*pud)) return; pmd = pmd_offset(pud, addr); diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 33b3461d91e8..54f5994d4cbb 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -119,6 +119,7 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) { pgd_t *pg; + p4d_t *p4; pud_t *pu; pmd_t *pm; hugepd_t *hpdp = NULL; @@ -128,20 +129,21 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz addr &= ~(sz-1); pg = pgd_offset(mm, addr); + p4 = p4d_offset(pg, addr); #ifdef CONFIG_PPC_BOOK3S_64 if (pshift == PGDIR_SHIFT) /* 16GB huge page */ - return (pte_t *) pg; + return (pte_t *) p4; else if (pshift > PUD_SHIFT) { /* * We need to use hugepd table */ ptl = &mm->page_table_lock; - hpdp = (hugepd_t *)pg; + hpdp = (hugepd_t *)p4; } else { pdshift = PUD_SHIFT; - pu = pud_alloc(mm, pg, addr); + pu = pud_alloc(mm, p4, addr); if (!pu) return NULL; if (pshift == PUD_SHIFT) @@ -166,10 +168,10 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz #else if (pshift >= PGDIR_SHIFT) { ptl = &mm->page_table_lock; - hpdp = (hugepd_t *)pg; + hpdp = (hugepd_t *)p4; } else { pdshift = PUD_SHIFT; - pu = pud_alloc(mm, pg, addr); + pu = pud_alloc(mm, p4, addr); if (!pu) return NULL; if (pshift >= PUD_SHIFT) { @@ -390,7 +392,7 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, mm_dec_nr_pmds(tlb->mm); } -static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, +static void hugetlb_free_pud_range(struct mmu_gather *tlb, p4d_t *p4d, unsigned long addr, unsigned long end, unsigned long floor, unsigned long ceiling) { @@ -400,7 +402,7 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, start = addr; do { - pud = pud_offset(pgd, addr); + pud = pud_offset(p4d, addr); next = pud_addr_end(addr, end); if (!is_hugepd(__hugepd(pud_val(*pud)))) { if (pud_none_or_clear_bad(pud)) @@ -435,8 +437,8 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, if (end - 1 > ceiling - 1) return; - pud = pud_offset(pgd, start); - pgd_clear(pgd); + pud = pud_offset(p4d, start); + p4d_clear(p4d); pud_free_tlb(tlb, pud, start); mm_dec_nr_puds(tlb->mm); } @@ -449,6 +451,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long floor, unsigned long ceiling) { pgd_t *pgd; + p4d_t *p4d; unsigned long next; /* @@ -471,10 +474,11 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, do { next = pgd_addr_end(addr, end); pgd = pgd_offset(tlb->mm, addr); + p4d = p4d_offset(pgd, addr); if (!is_hugepd(__hugepd(pgd_val(*pgd)))) { - if (pgd_none_or_clear_bad(pgd)) + if (p4d_none_or_clear_bad(p4d)) continue; - hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling); + hugetlb_free_pud_range(tlb, p4d, addr, next, floor, ceiling); } else { unsigned long more; /* @@ -487,7 +491,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, if (more > next) next = more; - free_hugepd_range(tlb, (hugepd_t *)pgd, PGDIR_SHIFT, + free_hugepd_range(tlb, (hugepd_t *)p4d, PGDIR_SHIFT, addr, next, floor, ceiling); } } while (addr = next, addr != end); diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c index db5664dde5ff..88e2e16380b5 100644 --- a/arch/powerpc/mm/kasan/kasan_init_32.c +++ b/arch/powerpc/mm/kasan/kasan_init_32.c @@ -36,7 +36,7 @@ static int __init kasan_init_shadow_page_tables(unsigned long k_start, unsigned unsigned long k_cur, k_next; pte_t *new = NULL; - pmd = pmd_offset(pud_offset(pgd_offset_k(k_start), k_start), k_start); + pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(k_start), k_start), k_start), k_start); for (k_cur = k_start; k_cur != k_end; k_cur = k_next, pmd++) { k_next = pgd_addr_end(k_cur, k_end); @@ -78,7 +78,7 @@ static int __init kasan_init_region(void *start, size_t size) block = memblock_alloc(k_end - k_start, PAGE_SIZE); for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { - pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur); + pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(k_cur), k_cur), k_cur), k_cur); void *va = block + k_cur - k_start; pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL); @@ -102,7 +102,7 @@ static void __init kasan_remap_early_shadow_ro(void) kasan_populate_pte(kasan_early_shadow_pte, prot); for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { - pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur); + pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(k_cur), k_cur), k_cur), k_cur); pte_t *ptep = pte_offset_kernel(pmd, k_cur); if ((pte_val(*ptep) & PTE_RPN_MASK) != pa) @@ -201,7 +201,7 @@ void __init kasan_early_init(void) unsigned long addr = KASAN_SHADOW_START; unsigned long end = KASAN_SHADOW_END; unsigned long next; - pmd_t *pmd = pmd_offset(pud_offset(pgd_offset_k(addr), addr), addr); + pmd_t *pmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(addr), addr), addr), addr); BUILD_BUG_ON(KASAN_SHADOW_START & ~PGDIR_MASK); diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index ef7b1119b2e2..8262b384dcf3 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -69,8 +69,8 @@ EXPORT_SYMBOL(kmap_prot); static inline pte_t *virt_to_kpte(unsigned long vaddr) { - return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), - vaddr), vaddr), vaddr); + return pte_offset_kernel(pmd_offset(pud_offset(p4d_offset(pgd_offset_k(vaddr), + vaddr), vaddr), vaddr), vaddr); } #endif diff --git a/arch/powerpc/mm/nohash/40x.c b/arch/powerpc/mm/nohash/40x.c index f348104eb461..7aaf7155e350 100644 --- a/arch/powerpc/mm/nohash/40x.c +++ b/arch/powerpc/mm/nohash/40x.c @@ -104,7 +104,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) pmd_t *pmdp; unsigned long val = p | _PMD_SIZE_16M | _PAGE_EXEC | _PAGE_HWWRITE; - pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v); + pmdp = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(v), v), v), v); *pmdp++ = __pmd(val); *pmdp++ = __pmd(val); *pmdp++ = __pmd(val); @@ -119,7 +119,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) pmd_t *pmdp; unsigned long val = p | _PMD_SIZE_4M | _PAGE_EXEC | _PAGE_HWWRITE; - pmdp = pmd_offset(pud_offset(pgd_offset_k(v), v), v); + pmdp = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(v), v), v), v); *pmdp = __pmd(val); v += LARGE_PAGE_SIZE_4M; diff --git a/arch/powerpc/mm/nohash/book3e_pgtable.c b/arch/powerpc/mm/nohash/book3e_pgtable.c index 4637fdd469cf..77884e24281d 100644 --- a/arch/powerpc/mm/nohash/book3e_pgtable.c +++ b/arch/powerpc/mm/nohash/book3e_pgtable.c @@ -73,6 +73,7 @@ static void __init *early_alloc_pgtable(unsigned long size) int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) { pgd_t *pgdp; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; @@ -80,7 +81,8 @@ int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) BUILD_BUG_ON(TASK_SIZE_USER64 > PGTABLE_RANGE); if (slab_is_available()) { pgdp = pgd_offset_k(ea); - pudp = pud_alloc(&init_mm, pgdp, ea); + p4dp = p4d_offset(pgdp, ea); + pudp = pud_alloc(&init_mm, p4dp, ea); if (!pudp) return -ENOMEM; pmdp = pmd_alloc(&init_mm, pudp, ea); @@ -91,13 +93,12 @@ int __ref map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot) return -ENOMEM; } else { pgdp = pgd_offset_k(ea); -#ifndef __PAGETABLE_PUD_FOLDED - if (pgd_none(*pgdp)) { - pudp = early_alloc_pgtable(PUD_TABLE_SIZE); - pgd_populate(&init_mm, pgdp, pudp); + p4dp = p4d_offset(pgdp, ea); + if (p4d_none(*p4dp)) { + pmdp = early_alloc_pgtable(PMD_TABLE_SIZE); + p4d_populate(&init_mm, p4dp, pmdp); } -#endif /* !__PAGETABLE_PUD_FOLDED */ - pudp = pud_offset(pgdp, ea); + pudp = pud_offset(p4dp, ea); if (pud_none(*pudp)) { pmdp = early_alloc_pgtable(PMD_TABLE_SIZE); pud_populate(&init_mm, pudp, pmdp); diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c index e3759b69f81b..c2499271f6c1 100644 --- a/arch/powerpc/mm/pgtable.c +++ b/arch/powerpc/mm/pgtable.c @@ -265,6 +265,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma, void assert_pte_locked(struct mm_struct *mm, unsigned long addr) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; @@ -272,7 +273,9 @@ void assert_pte_locked(struct mm_struct *mm, unsigned long addr) return; pgd = mm->pgd + pgd_index(addr); BUG_ON(pgd_none(*pgd)); - pud = pud_offset(pgd, addr); + p4d = p4d_offset(pgd, addr); + BUG_ON(p4d_none(*p4d)); + pud = pud_offset(p4d, addr); BUG_ON(pud_none(*pud)); pmd = pmd_offset(pud, addr); /* @@ -312,12 +315,13 @@ EXPORT_SYMBOL_GPL(vmalloc_to_phys); pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea, bool *is_thp, unsigned *hpage_shift) { - pgd_t pgd, *pgdp; + pgd_t *pgdp; + p4d_t p4d, *p4dp; pud_t pud, *pudp; pmd_t pmd, *pmdp; pte_t *ret_pte; hugepd_t *hpdp = NULL; - unsigned pdshift = PGDIR_SHIFT; + unsigned pdshift; if (hpage_shift) *hpage_shift = 0; @@ -325,24 +329,28 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea, if (is_thp) *is_thp = false; - pgdp = pgdir + pgd_index(ea); - pgd = READ_ONCE(*pgdp); /* * Always operate on the local stack value. This make sure the * value don't get updated by a parallel THP split/collapse, * page fault or a page unmap. The return pte_t * is still not * stable. So should be checked there for above conditions. + * Top level is an exception because it is folded into p4d. */ - if (pgd_none(pgd)) + pgdp = pgdir + pgd_index(ea); + p4dp = p4d_offset(pgdp, ea); + p4d = READ_ONCE(*p4dp); + pdshift = P4D_SHIFT; + + if (p4d_none(p4d)) return NULL; - if (pgd_is_leaf(pgd)) { - ret_pte = (pte_t *)pgdp; + if (p4d_is_leaf(p4d)) { + ret_pte = (pte_t *)p4dp; goto out; } - if (is_hugepd(__hugepd(pgd_val(pgd)))) { - hpdp = (hugepd_t *)&pgd; + if (is_hugepd(__hugepd(p4d_val(p4d)))) { + hpdp = (hugepd_t *)&p4d; goto out_huge; } @@ -352,7 +360,7 @@ pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea, * irq disabled */ pdshift = PUD_SHIFT; - pudp = pud_offset(&pgd, ea); + pudp = pud_offset(&p4d, ea); pud = READ_ONCE(*pudp); if (pud_none(pud)) diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 5fb90edd865e..5774d4bc94d0 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -63,7 +63,7 @@ int __ref map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot) int err = -ENOMEM; /* Use upper 10 bits of VA to index the first level map */ - pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va); + pd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va); /* Use middle 10 bits of VA to index the second-level map */ if (likely(slab_is_available())) pg = pte_alloc_kernel(pd, va); @@ -121,53 +121,24 @@ void __init mapin_ram(void) } } -/* Scan the real Linux page tables and return a PTE pointer for - * a virtual address in a context. - * Returns true (1) if PTE was found, zero otherwise. The pointer to - * the PTE pointer is unmodified if PTE is not found. - */ -static int -get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp) -{ - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - int retval = 0; - - pgd = pgd_offset(mm, addr & PAGE_MASK); - if (pgd) { - pud = pud_offset(pgd, addr & PAGE_MASK); - if (pud && pud_present(*pud)) { - pmd = pmd_offset(pud, addr & PAGE_MASK); - if (pmd_present(*pmd)) { - pte = pte_offset_map(pmd, addr & PAGE_MASK); - if (pte) { - retval = 1; - *ptep = pte; - if (pmdp) - *pmdp = pmd; - /* XXX caller needs to do pte_unmap, yuck */ - } - } - } - } - return(retval); -} - static int __change_page_attr_noflush(struct page *page, pgprot_t prot) { pte_t *kpte; pmd_t *kpmd; - unsigned long address; + unsigned long address, va; BUG_ON(PageHighMem(page)); address = (unsigned long)page_address(page); + va = address & PAGE_MASK; if (v_block_mapped(address)) return 0; - if (!get_pteptr(&init_mm, address, &kpte, &kpmd)) + + kpmd = pmd_offset(pud_offset(p4d_offset(pgd_offset_k(va), va), va), va); + if (!pmd_present(*kpmd)) return -EINVAL; + + kpte = pte_offset_map(kpmd, va); __set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0); pte_unmap(kpte); diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index e78832dce7bb..1f86a88fd4bb 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -101,13 +101,13 @@ EXPORT_SYMBOL(__pte_frag_size_shift); #ifndef __PAGETABLE_PUD_FOLDED /* 4 level page table */ -struct page *pgd_page(pgd_t pgd) +struct page *p4d_page(p4d_t p4d) { - if (pgd_is_leaf(pgd)) { - VM_WARN_ON(!pgd_huge(pgd)); - return pte_page(pgd_pte(pgd)); + if (p4d_is_leaf(p4d)) { + VM_WARN_ON(!p4d_huge(p4d)); + return pte_page(p4d_pte(p4d)); } - return virt_to_page(pgd_page_vaddr(pgd)); + return virt_to_page(p4d_page_vaddr(p4d)); } #endif diff --git a/arch/powerpc/mm/ptdump/hashpagetable.c b/arch/powerpc/mm/ptdump/hashpagetable.c index a07278027c6f..ac360ad865a8 100644 --- a/arch/powerpc/mm/ptdump/hashpagetable.c +++ b/arch/powerpc/mm/ptdump/hashpagetable.c @@ -417,9 +417,9 @@ 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; @@ -431,6 +431,20 @@ 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 exists */ + walk_pud(st, p4d, addr); + } +} + static void walk_pagetables(struct pg_state *st) { pgd_t *pgd = pgd_offset_k(0UL); @@ -445,7 +459,7 @@ static void walk_pagetables(struct pg_state *st) addr = KERN_VIRT_START + i * PGDIR_SIZE; if (!pgd_none(*pgd)) /* pgd exists */ - walk_pud(st, pgd, addr); + walk_p4d(st, pgd, addr); } } diff --git a/arch/powerpc/mm/ptdump/ptdump.c b/arch/powerpc/mm/ptdump/ptdump.c index 206156255247..9d6256b61df3 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; @@ -304,11 +304,13 @@ static void walk_pagetables(struct pg_state *st) * the hash pagetable. */ 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); + p4d_t *p4d = p4d_offset(pgd, 0); + + if (!p4d_none(*p4d) && !p4d_is_leaf(*p4d)) + /* p4d exists */ + walk_pud(st, p4d, addr); else - note_page(st, addr, 1, pgd_val(*pgd)); + note_page(st, addr, 1, p4d_val(*p4d)); } } diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 0ec9640335bb..3e29128c58cc 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -3130,6 +3130,7 @@ static void show_pte(unsigned long addr) struct task_struct *tsk = NULL; struct mm_struct *mm; pgd_t *pgdp, *pgdir; + p4d_t *p4dp; pud_t *pudp; pmd_t *pmdp; pte_t *ptep; @@ -3161,20 +3162,21 @@ static void show_pte(unsigned long addr) pgdir = pgd_offset(mm, 0); } - if (pgd_none(*pgdp)) { - printf("no linux page table for address\n"); + p4dp = p4d_offset(pgdp, addr); + + if (p4d_none(*p4dp)) { + printf("No valid P4D\n"); return; } - printf("pgd @ 0x%px\n", pgdir); - - if (pgd_is_leaf(*pgdp)) { - format_pte(pgdp, pgd_val(*pgdp)); + if (p4d_is_leaf(*p4dp)) { + format_pte(p4dp, p4d_val(*p4dp)); return; } - printf("pgdp @ 0x%px = 0x%016lx\n", pgdp, pgd_val(*pgdp)); - pudp = pud_offset(pgdp, addr); + printf("p4dp @ 0x%px = 0x%016lx\n", p4dp, p4d_val(*p4dp)); + + pudp = pud_offset(p4dp, addr); if (pud_none(*pudp)) { printf("No valid PUD\n"); -- 2.24.0