From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com> Cc: Andi Kleen <ak@linux.intel.com>, Dave Hansen <dave.hansen@intel.com>, Andy Lutomirski <luto@amacapital.net>, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH 4/8] x86/mm: Add sync_global_pgds() for configuration with 5-level paging Date: Thu, 6 Apr 2017 17:01:02 +0300 [thread overview] Message-ID: <20170406140106.78087-5-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <20170406140106.78087-1-kirill.shutemov@linux.intel.com> This basically restores slightly modified version of original sync_global_pgds() which we had before folded p4d was introduced. The only modification is protection against 'address' overflow. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/mm/init_64.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index a242139df8fe..0b62b13e8655 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -92,6 +92,40 @@ __setup("noexec32=", nonx32_setup); * When memory was added make sure all the processes MM have * suitable PGD entries in the local PGD level page. */ +#ifdef CONFIG_X86_5LEVEL +void sync_global_pgds(unsigned long start, unsigned long end) +{ + unsigned long address; + + for (address = start; address <= end && address >= start; address += PGDIR_SIZE) { + const pgd_t *pgd_ref = pgd_offset_k(address); + struct page *page; + + if (pgd_none(*pgd_ref)) + continue; + + spin_lock(&pgd_lock); + list_for_each_entry(page, &pgd_list, lru) { + pgd_t *pgd; + spinlock_t *pgt_lock; + + pgd = (pgd_t *)page_address(page) + pgd_index(address); + /* the pgt_lock only for Xen */ + pgt_lock = &pgd_page_get_mm(page)->page_table_lock; + spin_lock(pgt_lock); + + if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) + BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref)); + + if (pgd_none(*pgd)) + set_pgd(pgd, *pgd_ref); + + spin_unlock(pgt_lock); + } + spin_unlock(&pgd_lock); + } +} +#else void sync_global_pgds(unsigned long start, unsigned long end) { unsigned long address; @@ -135,6 +169,7 @@ void sync_global_pgds(unsigned long start, unsigned long end) spin_unlock(&pgd_lock); } } +#endif /* * NOTE: This function is marked __ref because it calls __init function -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> To: Linus Torvalds <torvalds@linux-foundation.org>, Andrew Morton <akpm@linux-foundation.org>, x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com> Cc: Andi Kleen <ak@linux.intel.com>, Dave Hansen <dave.hansen@intel.com>, Andy Lutomirski <luto@amacapital.net>, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Subject: [PATCH 4/8] x86/mm: Add sync_global_pgds() for configuration with 5-level paging Date: Thu, 6 Apr 2017 17:01:02 +0300 [thread overview] Message-ID: <20170406140106.78087-5-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <20170406140106.78087-1-kirill.shutemov@linux.intel.com> This basically restores slightly modified version of original sync_global_pgds() which we had before folded p4d was introduced. The only modification is protection against 'address' overflow. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/mm/init_64.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index a242139df8fe..0b62b13e8655 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -92,6 +92,40 @@ __setup("noexec32=", nonx32_setup); * When memory was added make sure all the processes MM have * suitable PGD entries in the local PGD level page. */ +#ifdef CONFIG_X86_5LEVEL +void sync_global_pgds(unsigned long start, unsigned long end) +{ + unsigned long address; + + for (address = start; address <= end && address >= start; address += PGDIR_SIZE) { + const pgd_t *pgd_ref = pgd_offset_k(address); + struct page *page; + + if (pgd_none(*pgd_ref)) + continue; + + spin_lock(&pgd_lock); + list_for_each_entry(page, &pgd_list, lru) { + pgd_t *pgd; + spinlock_t *pgt_lock; + + pgd = (pgd_t *)page_address(page) + pgd_index(address); + /* the pgt_lock only for Xen */ + pgt_lock = &pgd_page_get_mm(page)->page_table_lock; + spin_lock(pgt_lock); + + if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) + BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref)); + + if (pgd_none(*pgd)) + set_pgd(pgd, *pgd_ref); + + spin_unlock(pgt_lock); + } + spin_unlock(&pgd_lock); + } +} +#else void sync_global_pgds(unsigned long start, unsigned long end) { unsigned long address; @@ -135,6 +169,7 @@ void sync_global_pgds(unsigned long start, unsigned long end) spin_unlock(&pgd_lock); } } +#endif /* * NOTE: This function is marked __ref because it calls __init function -- 2.11.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-04-06 14:01 UTC|newest] Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-06 14:00 [PATCH 0/8] x86: 5-level paging enabling for v4.12, Part 4 Kirill A. Shutemov 2017-04-06 14:00 ` Kirill A. Shutemov 2017-04-06 14:00 ` [PATCH 1/8] x86/boot/64: Rewrite startup_64 in C Kirill A. Shutemov 2017-04-06 14:00 ` Kirill A. Shutemov 2017-04-11 7:58 ` [tip:x86/mm] x86/boot/64: Rewrite startup_64() " tip-bot for Kirill A. Shutemov 2017-04-11 8:54 ` Ingo Molnar 2017-04-11 12:29 ` Kirill A. Shutemov 2017-04-06 14:01 ` [PATCH 2/8] x86/boot/64: Rename init_level4_pgt and early_level4_pgt Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov 2017-04-11 7:59 ` [tip:x86/mm] x86/boot/64: Rename init_level4_pgt() and early_level4_pgt[] tip-bot for Kirill A. Shutemov 2017-04-06 14:01 ` [PATCH 3/8] x86/boot/64: Add support of additional page table level during early boot Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov 2017-04-11 7:02 ` Ingo Molnar 2017-04-11 7:02 ` Ingo Molnar 2017-04-11 10:51 ` Kirill A. Shutemov 2017-04-11 10:51 ` Kirill A. Shutemov 2017-04-11 11:28 ` Ingo Molnar 2017-04-11 11:28 ` Ingo Molnar 2017-04-11 11:46 ` Kirill A. Shutemov 2017-04-11 11:46 ` Kirill A. Shutemov 2017-04-11 14:09 ` Andi Kleen 2017-04-11 14:09 ` Andi Kleen 2017-04-12 10:18 ` Kirill A. Shutemov 2017-04-12 10:18 ` Kirill A. Shutemov 2017-04-17 10:32 ` Ingo Molnar 2017-04-17 10:32 ` Ingo Molnar 2017-04-18 8:59 ` Kirill A. Shutemov 2017-04-18 8:59 ` Kirill A. Shutemov 2017-04-18 10:15 ` Kirill A. Shutemov 2017-04-18 10:15 ` Kirill A. Shutemov 2017-04-18 11:10 ` Kirill A. Shutemov 2017-04-18 11:10 ` Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov [this message] 2017-04-06 14:01 ` [PATCH 4/8] x86/mm: Add sync_global_pgds() for configuration with 5-level paging Kirill A. Shutemov 2017-04-06 14:01 ` [PATCH 5/8] x86/mm: Make kernel_physical_mapping_init() support " Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov 2017-04-06 14:01 ` [PATCH 6/8] x86/mm: Add support for 5-level paging for KASLR Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov 2017-04-06 14:01 ` [PATCH 7/8] x86: Enable 5-level paging support Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov 2017-04-06 14:52 ` Juergen Gross 2017-04-06 14:52 ` Juergen Gross 2017-04-06 15:24 ` Kirill A. Shutemov 2017-04-06 15:24 ` Kirill A. Shutemov 2017-04-06 15:56 ` Juergen Gross 2017-04-06 15:56 ` Juergen Gross 2017-04-06 14:01 ` [PATCH 8/8] x86/mm: Allow to have userspace mappings above 47-bits Kirill A. Shutemov 2017-04-06 14:01 ` Kirill A. Shutemov 2017-04-06 18:43 ` Dmitry Safonov 2017-04-06 18:43 ` Dmitry Safonov 2017-04-06 18:43 ` Dmitry Safonov 2017-04-06 19:15 ` Dmitry Safonov 2017-04-06 19:15 ` Dmitry Safonov 2017-04-06 19:15 ` Dmitry Safonov 2017-04-06 23:21 ` Kirill A. Shutemov 2017-04-06 23:21 ` Kirill A. Shutemov 2017-04-06 23:24 ` [PATCHv2 " Kirill A. Shutemov 2017-04-06 23:24 ` Kirill A. Shutemov 2017-04-07 11:32 ` Dmitry Safonov 2017-04-07 11:32 ` Dmitry Safonov 2017-04-07 11:32 ` Dmitry Safonov 2017-04-07 15:44 ` [PATCHv3 " Kirill A. Shutemov 2017-04-07 15:44 ` Kirill A. Shutemov 2017-04-07 16:37 ` Dmitry Safonov 2017-04-07 16:37 ` Dmitry Safonov 2017-04-07 16:37 ` Dmitry Safonov 2017-04-13 11:30 ` [PATCHv4 0/9] x86: 5-level paging enabling for v4.12, Part 4 Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 1/9] x86/asm: Fix comment in return_from_SYSCALL_64 Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 2/9] x86/boot/64: Rewrite startup_64 in C Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 3/9] x86/boot/64: Rename init_level4_pgt and early_level4_pgt Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 4/9] x86/boot/64: Add support of additional page table level during early boot Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 5/9] x86/mm: Add sync_global_pgds() for configuration with 5-level paging Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 6/9] x86/mm: Make kernel_physical_mapping_init() support " Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 7/9] x86/mm: Add support for 5-level paging for KASLR Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 8/9] x86: Enable 5-level paging support Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-13 11:30 ` [PATCHv4 9/9] x86/mm: Allow to have userspace mappings above 47-bits Kirill A. Shutemov 2017-04-13 11:30 ` Kirill A. Shutemov 2017-04-07 10:06 ` [PATCH 8/8] " Dmitry Safonov 2017-04-07 10:06 ` Dmitry Safonov 2017-04-07 10:06 ` Dmitry Safonov 2017-04-07 13:35 ` Anshuman Khandual 2017-04-07 13:35 ` Anshuman Khandual 2017-04-07 15:59 ` Kirill A. Shutemov 2017-04-07 15:59 ` Kirill A. Shutemov 2017-04-07 16:09 ` hpa 2017-04-07 16:09 ` hpa 2017-04-07 16:20 ` Kirill A. Shutemov 2017-04-07 16:20 ` Kirill A. Shutemov 2017-04-12 10:41 ` Michael Ellerman 2017-04-12 10:41 ` Michael Ellerman 2017-04-12 11:11 ` Kirill A. Shutemov 2017-04-12 11:11 ` Kirill A. Shutemov
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