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>, Arnd Bergmann <arnd@arndb.de>, "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: [RFC, PATCHv1 22/28] x86/espfix: support 5-level paging Date: Thu, 8 Dec 2016 19:21:44 +0300 [thread overview] Message-ID: <20161208162150.148763-24-kirill.shutemov@linux.intel.com> (raw) In-Reply-To: <20161208162150.148763-1-kirill.shutemov@linux.intel.com> XXX: how to test this? Not-yet-Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/kernel/espfix_64.c | 41 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c index 04f89caef9c4..f0afa0af4237 100644 --- a/arch/x86/kernel/espfix_64.c +++ b/arch/x86/kernel/espfix_64.c @@ -70,8 +70,15 @@ static DEFINE_MUTEX(espfix_init_mutex); #define ESPFIX_MAX_PAGES DIV_ROUND_UP(CONFIG_NR_CPUS, ESPFIX_STACKS_PER_PAGE) static void *espfix_pages[ESPFIX_MAX_PAGES]; -static __page_aligned_bss pud_t espfix_pud_page[PTRS_PER_PUD] +#if CONFIG_PGTABLE_LEVELS == 5 +static __page_aligned_bss pud_t espfix_pgtable_page[PTRS_PER_PUD] __aligned(PAGE_SIZE); +#elif CONFIG_PGTABLE_LEVELS == 4 +static __page_aligned_bss pud_t espfix_pgtable_page[PTRS_PER_PUD] + __aligned(PAGE_SIZE); +#else +#error Unexpected CONFIG_PGTABLE_LEVELS +#endif static unsigned int page_random, slot_random; @@ -97,6 +104,8 @@ static inline unsigned long espfix_base_addr(unsigned int cpu) #define ESPFIX_PTE_CLONES (PTRS_PER_PTE/PTE_STRIDE) #define ESPFIX_PMD_CLONES PTRS_PER_PMD #define ESPFIX_PUD_CLONES (65536/(ESPFIX_PTE_CLONES*ESPFIX_PMD_CLONES)) +/* XXX: what should it be? */ +#define ESPFIX_P4D_CLONES PTRS_PER_P4D #define PGTABLE_PROT ((_KERNPG_TABLE & ~_PAGE_RW) | _PAGE_NX) @@ -122,10 +131,21 @@ static void init_espfix_random(void) void __init init_espfix_bsp(void) { pgd_t *pgd_p; + p4d_t *p4d; /* Install the espfix pud into the kernel page directory */ pgd_p = &init_level4_pgt[pgd_index(ESPFIX_BASE_ADDR)]; - pgd_populate(&init_mm, pgd_p, (pud_t *)espfix_pud_page); + switch (CONFIG_PGTABLE_LEVELS) { + case 4: + p4d = p4d_offset(pgd_p, ESPFIX_BASE_ADDR); + p4d_populate(&init_mm, p4d, (pud_t *)espfix_pgtable_page); + break; + case 5: + pgd_populate(&init_mm, pgd_p, (p4d_t *)espfix_pgtable_page); + break; + default: + BUILD_BUG(); + } /* Randomize the locations */ init_espfix_random(); @@ -138,6 +158,7 @@ void init_espfix_ap(int cpu) { unsigned int page; unsigned long addr; + p4d_t p4d, *p4d_p; pud_t pud, *pud_p; pmd_t pmd, *pmd_p; pte_t pte, *pte_p; @@ -167,7 +188,21 @@ void init_espfix_ap(int cpu) node = cpu_to_node(cpu); ptemask = __supported_pte_mask; - pud_p = &espfix_pud_page[pud_index(addr)]; + if (CONFIG_PGTABLE_LEVELS == 5) { + p4d_p = (p4d_t *)espfix_pgtable_page + p4d_index(addr); + p4d = *p4d_p; + if (!p4d_present(p4d)) { + struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0); + + pud_p = (pud_t *)page_address(page); + p4d = __p4d(__pa(pud_p) | (PGTABLE_PROT & ptemask)); + paravirt_alloc_pud(&init_mm, __pa(pud_p) >> PAGE_SHIFT); + for (n = 0; n < ESPFIX_P4D_CLONES; n++) + set_p4d(&p4d_p[n], p4d); + } + } else { + pud_p = (pud_t *)espfix_pgtable_page + pud_index(addr); + } pud = *pud_p; if (!pud_present(pud)) { struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0); -- 2.10.2 -- 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>
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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>, Arnd Bergmann <arnd@arndb.de>, "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: [RFC, PATCHv1 22/28] x86/espfix: support 5-level paging Date: Thu, 8 Dec 2016 19:21:44 +0300 [thread overview] Message-ID: <20161208162150.148763-24-kirill.shutemov@linux.intel.com> (raw) Message-ID: <20161208162144.OSZMV65obPxXJWlO3qc68aCe1lrzPsDtgEhfmEBLP0I@z> (raw) In-Reply-To: <20161208162150.148763-1-kirill.shutemov@linux.intel.com> XXX: how to test this? Not-yet-Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- arch/x86/kernel/espfix_64.c | 41 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/espfix_64.c b/arch/x86/kernel/espfix_64.c index 04f89caef9c4..f0afa0af4237 100644 --- a/arch/x86/kernel/espfix_64.c +++ b/arch/x86/kernel/espfix_64.c @@ -70,8 +70,15 @@ static DEFINE_MUTEX(espfix_init_mutex); #define ESPFIX_MAX_PAGES DIV_ROUND_UP(CONFIG_NR_CPUS, ESPFIX_STACKS_PER_PAGE) static void *espfix_pages[ESPFIX_MAX_PAGES]; -static __page_aligned_bss pud_t espfix_pud_page[PTRS_PER_PUD] +#if CONFIG_PGTABLE_LEVELS == 5 +static __page_aligned_bss pud_t espfix_pgtable_page[PTRS_PER_PUD] __aligned(PAGE_SIZE); +#elif CONFIG_PGTABLE_LEVELS == 4 +static __page_aligned_bss pud_t espfix_pgtable_page[PTRS_PER_PUD] + __aligned(PAGE_SIZE); +#else +#error Unexpected CONFIG_PGTABLE_LEVELS +#endif static unsigned int page_random, slot_random; @@ -97,6 +104,8 @@ static inline unsigned long espfix_base_addr(unsigned int cpu) #define ESPFIX_PTE_CLONES (PTRS_PER_PTE/PTE_STRIDE) #define ESPFIX_PMD_CLONES PTRS_PER_PMD #define ESPFIX_PUD_CLONES (65536/(ESPFIX_PTE_CLONES*ESPFIX_PMD_CLONES)) +/* XXX: what should it be? */ +#define ESPFIX_P4D_CLONES PTRS_PER_P4D #define PGTABLE_PROT ((_KERNPG_TABLE & ~_PAGE_RW) | _PAGE_NX) @@ -122,10 +131,21 @@ static void init_espfix_random(void) void __init init_espfix_bsp(void) { pgd_t *pgd_p; + p4d_t *p4d; /* Install the espfix pud into the kernel page directory */ pgd_p = &init_level4_pgt[pgd_index(ESPFIX_BASE_ADDR)]; - pgd_populate(&init_mm, pgd_p, (pud_t *)espfix_pud_page); + switch (CONFIG_PGTABLE_LEVELS) { + case 4: + p4d = p4d_offset(pgd_p, ESPFIX_BASE_ADDR); + p4d_populate(&init_mm, p4d, (pud_t *)espfix_pgtable_page); + break; + case 5: + pgd_populate(&init_mm, pgd_p, (p4d_t *)espfix_pgtable_page); + break; + default: + BUILD_BUG(); + } /* Randomize the locations */ init_espfix_random(); @@ -138,6 +158,7 @@ void init_espfix_ap(int cpu) { unsigned int page; unsigned long addr; + p4d_t p4d, *p4d_p; pud_t pud, *pud_p; pmd_t pmd, *pmd_p; pte_t pte, *pte_p; @@ -167,7 +188,21 @@ void init_espfix_ap(int cpu) node = cpu_to_node(cpu); ptemask = __supported_pte_mask; - pud_p = &espfix_pud_page[pud_index(addr)]; + if (CONFIG_PGTABLE_LEVELS == 5) { + p4d_p = (p4d_t *)espfix_pgtable_page + p4d_index(addr); + p4d = *p4d_p; + if (!p4d_present(p4d)) { + struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0); + + pud_p = (pud_t *)page_address(page); + p4d = __p4d(__pa(pud_p) | (PGTABLE_PROT & ptemask)); + paravirt_alloc_pud(&init_mm, __pa(pud_p) >> PAGE_SHIFT); + for (n = 0; n < ESPFIX_P4D_CLONES; n++) + set_p4d(&p4d_p[n], p4d); + } + } else { + pud_p = (pud_t *)espfix_pgtable_page + pud_index(addr); + } pud = *pud_p; if (!pud_present(pud)) { struct page *page = alloc_pages_node(node, PGALLOC_GFP, 0); -- 2.10.2
next prev parent reply other threads:[~2016-12-08 16:21 UTC|newest] Thread overview: 113+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-12-08 16:21 [RFC, PATCHv1 00/28] 5-level paging Kirill A. Shutemov 2016-12-08 16:21 ` [QEMU, PATCH] x86: implement la57 paging mode Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:48 ` [Qemu-devel] " no-reply 2016-12-08 16:48 ` no-reply 2016-12-08 16:21 ` [RFC, PATCHv1 01/28] asm-generic: introduce 5level-fixup.h Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 02/28] asm-generic: introduce __ARCH_USE_5LEVEL_HACK Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 03/28] arch, mm: convert all architectures to use 5level-fixup.h Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 04/28] asm-generic: introduce <asm-generic/pgtable-nop4d.h> Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 05/28] mm: convert generic code to 5-level paging Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 06/28] x86: basic changes into headers for " Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 07/28] x86: trivial portion of 5-level paging conversion Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 08/28] x86/gup: add 5-level paging support Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 09/28] x86/ident_map: " Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 10/28] x86/mm: add support of p4d_t in vmalloc_fault() Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 11/28] x86/power: support p4d_t in hibernate code Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 12/28] x86/kexec: support p4d_t Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 13/28] x86: convert the rest of the code to " Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 14/28] mm: introduce __p4d_alloc() Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 15/28] x86: detect 5-level paging support Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 20:05 ` Borislav Petkov 2016-12-08 20:08 ` Linus Torvalds 2016-12-08 20:08 ` Linus Torvalds 2016-12-08 20:20 ` Borislav Petkov 2016-12-13 22:44 ` H. Peter Anvin 2016-12-13 22:44 ` H. Peter Anvin 2016-12-13 23:07 ` Boris Petkov 2016-12-13 23:07 ` Boris Petkov 2016-12-15 14:39 ` Borislav Petkov 2016-12-15 14:39 ` Borislav Petkov 2016-12-15 17:52 ` hpa 2016-12-15 17:52 ` hpa 2016-12-15 19:09 ` Borislav Petkov 2016-12-15 19:20 ` Andi Kleen 2016-12-15 19:20 ` Andi Kleen 2016-12-15 20:52 ` hpa 2016-12-15 20:52 ` hpa 2016-12-15 20:57 ` hpa 2016-12-15 20:57 ` hpa 2016-12-09 15:32 ` Kirill A. Shutemov 2016-12-09 16:33 ` Borislav Petkov 2016-12-13 22:50 ` H. Peter Anvin 2016-12-13 22:50 ` H. Peter Anvin 2016-12-08 16:21 ` [RFC, PATCHv1 16/28] x86/asm: remove __VIRTUAL_MASK_SHIFT==47 assert Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 18:39 ` Andy Lutomirski 2016-12-08 19:22 ` Kirill A. Shutemov 2016-12-08 19:22 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 17/28] x86/mm: define virtual memory map for 5-level paging Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 18:56 ` Randy Dunlap 2016-12-08 19:24 ` Kirill A. Shutemov 2016-12-08 19:24 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 18/28] x86/paravirt: make paravirt code support " Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 19/28] x86/mm: basic defines/helpers for CONFIG_X86_5LEVEL Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 20/28] x86/dump_pagetables: support 5-level paging Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 21/28] x86/mm: extend kasan to " Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov [this message] 2016-12-08 16:21 ` [RFC, PATCHv1 22/28] x86/espfix: " Kirill A. Shutemov 2016-12-08 18:40 ` Andy Lutomirski 2016-12-08 18:40 ` Andy Lutomirski 2016-12-12 14:22 ` Kirill A. Shutemov 2016-12-12 14:22 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 23/28] x86/mm: add support of additional page table level during early boot Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 24/28] x86/mm: add sync_global_pgds() for configuration with 5-level paging Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 18:42 ` Andy Lutomirski 2016-12-08 19:33 ` Kirill A. Shutemov 2016-12-08 19:33 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 25/28] x86/mm: make kernel_physical_mapping_init() support " Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 26/28] x86/mm: add support for 5-level paging for KASLR Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 27/28] x86: enable la57 support Kirill A. Shutemov 2016-12-08 16:21 ` Kirill A. Shutemov 2016-12-08 16:21 ` [RFC, PATCHv1 28/28] TESTING-ONLY: bump TASK_SIZE_MAX Kirill A. Shutemov 2016-12-08 18:16 ` [RFC, PATCHv1 00/28] 5-level paging Linus Torvalds 2016-12-08 18:16 ` Linus Torvalds 2016-12-08 18:26 ` hpa 2016-12-08 18:26 ` hpa 2016-12-08 19:20 ` Kirill A. Shutemov 2016-12-08 19:20 ` Kirill A. Shutemov 2016-12-09 5:01 ` Ingo Molnar 2016-12-09 5:01 ` Ingo Molnar 2016-12-09 10:24 ` Arnd Bergmann 2016-12-09 10:51 ` Catalin Marinas 2016-12-09 10:51 ` Catalin Marinas 2016-12-09 10:37 ` Kirill A. Shutemov 2016-12-09 10:37 ` Kirill A. Shutemov 2016-12-09 16:40 ` Andi Kleen 2016-12-09 17:21 ` Kirill A. Shutemov 2016-12-09 17:21 ` Kirill A. Shutemov 2016-12-09 16:49 ` Dave Hansen 2016-12-09 16:49 ` Dave Hansen 2016-12-13 21:06 ` Dave Hansen 2016-12-13 21:06 ` Dave Hansen
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