From patchwork Mon Nov 4 06:56:26 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 11225071 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 50C831515 for ; Mon, 4 Nov 2019 06:58:34 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0264622467 for ; Mon, 4 Nov 2019 06:58:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="RZ5d3Alg" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0264622467 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0E2846B0269; Mon, 4 Nov 2019 01:58:33 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 06BCF6B026A; Mon, 4 Nov 2019 01:58:33 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E9BC46B026B; Mon, 4 Nov 2019 01:58:32 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0008.hostedemail.com [216.40.44.8]) by kanga.kvack.org (Postfix) with ESMTP id D14A06B0269 for ; Mon, 4 Nov 2019 01:58:32 -0500 (EST) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 4FA00181AEF15 for ; Mon, 4 Nov 2019 06:58:32 +0000 (UTC) X-FDA: 76117691664.25.pigs74_6796982801313 X-Spam-Summary: 2,0,0,efef4ebe27c77f82,d41d8cd98f00b204,rppt@kernel.org,::akpm@linux-foundation.org:anton.ivanov@cambridgegreys.com:arnd@arndb.de:davem@davemloft.net:geert@linux-m68k.org:green.hu@gmail.com:gerg@linux-m68k.org:deller@gmx.de:james.bottomley@hansenpartnership.com:jdike@addtoit.com:kirill@shutemov.name:torvalds@linux-foundation.org:msalter@redhat.com:mattst88@gmail.com:monstr@monstr.eu:peda@axentia.se:richard@nod.at:eike-kernel@sf-tec.de:linux@armlinux.org.uk:sammy@sammy.net:deanbo422@gmail.com:vineet.gupta1@synopsys.com:rppt@kernel.org:linux-alpha@vger.kernel.org:linux-arch@vger.kernel.org:linux-arm-kernel@lists.infradead.org:linux-c6x-dev@linux-c6x.org:linux-kernel@vger.kernel.org:linux-m68k@lists.linux-m68k.org:linux-parisc@vger.kernel.org:linux-um@lists.infradead.org:sparclinux@vger.kernel.org:rppt@linux.ibm.com,RULES_HIT:1:2:41:355:379:541:800:960:966:973:988:989:1260:1345:1359:1431:1437:1605:1730:1747:1777:1792:1981:2194:2196:2198:2199:2200:2201:2393:2559:2 562:2895 X-HE-Tag: pigs74_6796982801313 X-Filterd-Recvd-Size: 11785 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf47.hostedemail.com (Postfix) with ESMTP for ; Mon, 4 Nov 2019 06:58:31 +0000 (UTC) Received: from aquarius.haifa.ibm.com (nesher1.haifa.il.ibm.com [195.110.40.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6A73B2245C; Mon, 4 Nov 2019 06:58:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572850710; bh=j7sZZWpF/SasTsVFuAJ/3RwalDXEvLIHFbm/No8tVW8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RZ5d3Algd2vrnZb6VJ/EBA7hQUoBrQKDhKIFUKwiievktQS0KkxxceEOGtpN4RTFB iA5WmN0wKsw3VBXkxUWl3CBjUmLJ3zIlVd0KM0UpwBX+v85L//QTXNj+ReKqP2rKB7 5tYVNM3izbRiUFBMRgebKxWufL1RXNwvrDXBrphc= From: Mike Rapoport To: linux-mm@kvack.org Cc: Andrew Morton , Anton Ivanov , Arnd Bergmann , "David S. Miller" , Geert Uytterhoeven , Greentime Hu , Greg Ungerer , Helge Deller , "James E.J. Bottomley" , Jeff Dike , "Kirill A. Shutemov" , Linus Torvalds , Mark Salter , Matt Turner , Michal Simek , Peter Rosin , Richard Weinberger , Rolf Eike Beer , Russell King , Sam Creasey , Vincent Chen , Vineet Gupta , Mike Rapoport , linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-c6x-dev@linux-c6x.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-parisc@vger.kernel.org, linux-um@lists.infradead.org, sparclinux@vger.kernel.org, Mike Rapoport Subject: [PATCH v3 12/13] um: add support for folded p4d page tables Date: Mon, 4 Nov 2019 08:56:26 +0200 Message-Id: <1572850587-20314-13-git-send-email-rppt@kernel.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1572850587-20314-1-git-send-email-rppt@kernel.org> References: <1572850587-20314-1-git-send-email-rppt@kernel.org> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Mike Rapoport The UML port uses 4 and 5 level fixups to support higher level page table directories in the generic VM code. Implement primitives necessary for the 4th level folding, add walks of p4d level where appropriate and drop usage of __ARCH_USE_5LEVEL_HACK. Signed-off-by: Mike Rapoport --- arch/um/include/asm/pgtable-2level.h | 1 - arch/um/include/asm/pgtable-3level.h | 1 - arch/um/include/asm/pgtable.h | 3 ++ arch/um/kernel/mem.c | 8 ++++-- arch/um/kernel/skas/mmu.c | 12 ++++++-- arch/um/kernel/skas/uaccess.c | 7 ++++- arch/um/kernel/tlb.c | 56 ++++++++++++++++++++++++++++++++---- arch/um/kernel/trap.c | 4 ++- 8 files changed, 78 insertions(+), 14 deletions(-) diff --git a/arch/um/include/asm/pgtable-2level.h b/arch/um/include/asm/pgtable-2level.h index 32b3d26..32106d3 100644 --- a/arch/um/include/asm/pgtable-2level.h +++ b/arch/um/include/asm/pgtable-2level.h @@ -8,7 +8,6 @@ #ifndef __UM_PGTABLE_2LEVEL_H #define __UM_PGTABLE_2LEVEL_H -#define __ARCH_USE_5LEVEL_HACK #include /* PGDIR_SHIFT determines what a third-level page table entry can map */ diff --git a/arch/um/include/asm/pgtable-3level.h b/arch/um/include/asm/pgtable-3level.h index 9812269..8a3b689 100644 --- a/arch/um/include/asm/pgtable-3level.h +++ b/arch/um/include/asm/pgtable-3level.h @@ -7,7 +7,6 @@ #ifndef __UM_PGTABLE_3LEVEL_H #define __UM_PGTABLE_3LEVEL_H -#define __ARCH_USE_5LEVEL_HACK #include /* PGDIR_SHIFT determines what a third-level page table entry can map */ diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h index 36a44d5..2daa58d 100644 --- a/arch/um/include/asm/pgtable.h +++ b/arch/um/include/asm/pgtable.h @@ -106,6 +106,9 @@ extern unsigned long end_iomem; #define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE) #define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) +#define p4d_newpage(x) (p4d_val(x) & _PAGE_NEWPAGE) +#define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEWPAGE) + #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) #define pte_page(x) pfn_to_page(pte_pfn(x)) diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 417ff64..30885d0 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -96,6 +96,7 @@ static void __init fixrange_init(unsigned long start, unsigned long end, pgd_t *pgd_base) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; int i, j; @@ -107,7 +108,8 @@ static void __init fixrange_init(unsigned long start, unsigned long end, pgd = pgd_base + i; for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) { - pud = pud_offset(pgd, vaddr); + p4d = p4d_offset(pgd, vaddr); + pud = pud_offset(p4d, vaddr); if (pud_none(*pud)) one_md_table_init(pud); pmd = pmd_offset(pud, vaddr); @@ -124,6 +126,7 @@ static void __init fixaddr_user_init( void) #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA long size = FIXADDR_USER_END - FIXADDR_USER_START; pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -144,7 +147,8 @@ static void __init fixaddr_user_init( void) for ( ; size > 0; size -= PAGE_SIZE, vaddr += PAGE_SIZE, p += PAGE_SIZE) { pgd = swapper_pg_dir + pgd_index(vaddr); - pud = pud_offset(pgd, vaddr); + p4d = p4d_offset(pgd, vaddr); + pud = pud_offset(p4d, vaddr); pmd = pmd_offset(pud, vaddr); pte = pte_offset_kernel(pmd, vaddr); pte_set_val(*pte, p, PAGE_READONLY); diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c index b5e3d91..3f0d9a5 100644 --- a/arch/um/kernel/skas/mmu.c +++ b/arch/um/kernel/skas/mmu.c @@ -19,15 +19,21 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc, unsigned long kernel) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; pgd = pgd_offset(mm, proc); - pud = pud_alloc(mm, pgd, proc); - if (!pud) + + p4d = p4d_alloc(mm, pgd, proc); + if (!p4d) goto out; + pud = pud_alloc(mm, p4d, proc); + if (!pud) + goto out_pud; + pmd = pmd_alloc(mm, pud, proc); if (!pmd) goto out_pmd; @@ -44,6 +50,8 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc, pmd_free(mm, pmd); out_pmd: pud_free(mm, pud); + out_pud: + p4d_free(mm, p4d); out: return -ENOMEM; } diff --git a/arch/um/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c index 3236052..d617f8d 100644 --- a/arch/um/kernel/skas/uaccess.c +++ b/arch/um/kernel/skas/uaccess.c @@ -17,6 +17,7 @@ pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; @@ -27,7 +28,11 @@ pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr) if (!pgd_present(*pgd)) return NULL; - pud = pud_offset(pgd, addr); + p4d = p4d_offset(pgd, addr); + if (!p4d_present(*p4d)) + return NULL; + + pud = pud_offset(p4d, addr); if (!pud_present(*pud)) return NULL; diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c index 8425a22..80a358c 100644 --- a/arch/um/kernel/tlb.c +++ b/arch/um/kernel/tlb.c @@ -277,7 +277,7 @@ static inline int update_pmd_range(pud_t *pud, unsigned long addr, return ret; } -static inline int update_pud_range(pgd_t *pgd, unsigned long addr, +static inline int update_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, struct host_vm_change *hvc) { @@ -285,7 +285,7 @@ static inline int update_pud_range(pgd_t *pgd, unsigned long addr, unsigned long next; int ret = 0; - pud = pud_offset(pgd, addr); + pud = pud_offset(p4d, addr); do { next = pud_addr_end(addr, end); if (!pud_present(*pud)) { @@ -299,6 +299,28 @@ static inline int update_pud_range(pgd_t *pgd, unsigned long addr, return ret; } +static inline int update_p4d_range(pgd_t *pgd, unsigned long addr, + unsigned long end, + struct host_vm_change *hvc) +{ + p4d_t *p4d; + unsigned long next; + int ret = 0; + + p4d = p4d_offset(pgd, addr); + do { + next = p4d_addr_end(addr, end); + if (!p4d_present(*p4d)) { + if (hvc->force || p4d_newpage(*p4d)) { + ret = add_munmap(addr, next - addr, hvc); + p4d_mkuptodate(*p4d); + } + } else + ret = update_pud_range(p4d, addr, next, hvc); + } while (p4d++, addr = next, ((addr < end) && !ret)); + return ret; +} + void fix_range_common(struct mm_struct *mm, unsigned long start_addr, unsigned long end_addr, int force) { @@ -316,8 +338,8 @@ void fix_range_common(struct mm_struct *mm, unsigned long start_addr, ret = add_munmap(addr, next - addr, &hvc); pgd_mkuptodate(*pgd); } - } - else ret = update_pud_range(pgd, addr, next, &hvc); + } else + ret = update_p4d_range(pgd, addr, next, &hvc); } while (pgd++, addr = next, ((addr < end_addr) && !ret)); if (!ret) @@ -338,6 +360,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end) { struct mm_struct *mm; pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -364,7 +387,23 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end) continue; } - pud = pud_offset(pgd, addr); + p4d = p4d_offset(pgd, addr); + if (!p4d_present(*p4d)) { + last = ADD_ROUND(addr, P4D_SIZE); + if (last > end) + last = end; + if (p4d_newpage(*p4d)) { + updated = 1; + err = add_munmap(addr, last - addr, &hvc); + if (err < 0) + panic("munmap failed, errno = %d\n", + -err); + } + addr = last; + continue; + } + + pud = pud_offset(p4d, addr); if (!pud_present(*pud)) { last = ADD_ROUND(addr, PUD_SIZE); if (last > end) @@ -424,6 +463,7 @@ static int flush_tlb_kernel_range_common(unsigned long start, unsigned long end) void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) { pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -437,7 +477,11 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) if (!pgd_present(*pgd)) goto kill; - pud = pud_offset(pgd, address); + p4d = p4d_offset(pgd, address); + if (!p4d_present(*p4d)) + goto kill; + + pud = pud_offset(p4d, address); if (!pud_present(*pud)) goto kill; diff --git a/arch/um/kernel/trap.c b/arch/um/kernel/trap.c index e62296c..8185530 100644 --- a/arch/um/kernel/trap.c +++ b/arch/um/kernel/trap.c @@ -28,6 +28,7 @@ int handle_page_fault(unsigned long address, unsigned long ip, struct mm_struct *mm = current->mm; struct vm_area_struct *vma; pgd_t *pgd; + p4d_t *p4d; pud_t *pud; pmd_t *pmd; pte_t *pte; @@ -104,7 +105,8 @@ int handle_page_fault(unsigned long address, unsigned long ip, } pgd = pgd_offset(mm, address); - pud = pud_offset(pgd, address); + p4d = p4d_offset(pgd, address); + pud = pud_offset(p4d, address); pmd = pmd_offset(pud, address); pte = pte_offset_kernel(pmd, address); } while (!pte_present(*pte));