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 5/8] x86/mm: Add basic defines/helpers for CONFIG_X86_5LEVEL
Date: Mon, 27 Mar 2017 19:29:22 +0300 [thread overview]
Message-ID: <20170327162925.16092-6-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20170327162925.16092-1-kirill.shutemov@linux.intel.com>
Extends pagetable headers to support new paging mode.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
arch/x86/include/asm/pgtable_64.h | 11 +++++++++++
arch/x86/include/asm/pgtable_64_types.h | 20 +++++++++++++++++++
arch/x86/include/asm/pgtable_types.h | 10 +++++++++-
arch/x86/mm/pgtable.c | 34 ++++++++++++++++++++++++++++++++-
4 files changed, 73 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 0593a1ae7573..12ea31274eb6 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -35,6 +35,13 @@ extern void paging_init(void);
#define pud_ERROR(e) \
pr_err("%s:%d: bad pud %p(%016lx)\n", \
__FILE__, __LINE__, &(e), pud_val(e))
+
+#if CONFIG_PGTABLE_LEVELS >= 5
+#define p4d_ERROR(e) \
+ pr_err("%s:%d: bad p4d %p(%016lx)\n", \
+ __FILE__, __LINE__, &(e), p4d_val(e))
+#endif
+
#define pgd_ERROR(e) \
pr_err("%s:%d: bad pgd %p(%016lx)\n", \
__FILE__, __LINE__, &(e), pgd_val(e))
@@ -128,7 +135,11 @@ static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
static inline void native_p4d_clear(p4d_t *p4d)
{
+#ifdef CONFIG_X86_5LEVEL
+ native_set_p4d(p4d, native_make_p4d(0));
+#else
native_set_p4d(p4d, (p4d_t) { .pgd = native_make_pgd(0)});
+#endif
}
static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 4edc97917382..d3df6dc05d19 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -23,12 +23,32 @@ typedef struct { pteval_t pte; } pte_t;
#define SHARED_KERNEL_PMD 0
+#ifdef CONFIG_X86_5LEVEL
+
+/*
+ * PGDIR_SHIFT determines what a top-level page table entry can map
+ */
+#define PGDIR_SHIFT 48
+#define PTRS_PER_PGD 512
+
+/*
+ * 4rd level page in 5-level paging case
+ */
+#define P4D_SHIFT 39
+#define PTRS_PER_P4D 512
+#define P4D_SIZE (_AC(1, UL) << P4D_SHIFT)
+#define P4D_MASK (~(P4D_SIZE - 1))
+
+#else /* CONFIG_X86_5LEVEL */
+
/*
* PGDIR_SHIFT determines what a top-level page table entry can map
*/
#define PGDIR_SHIFT 39
#define PTRS_PER_PGD 512
+#endif /* CONFIG_X86_5LEVEL */
+
/*
* 3rd level page
*/
diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 4930afe9df0a..bf9638e1ee42 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -273,9 +273,17 @@ static inline pgdval_t pgd_flags(pgd_t pgd)
}
#if CONFIG_PGTABLE_LEVELS > 4
+typedef struct { p4dval_t p4d; } p4d_t;
-#error FIXME
+static inline p4d_t native_make_p4d(pudval_t val)
+{
+ return (p4d_t) { val };
+}
+static inline p4dval_t native_p4d_val(p4d_t p4d)
+{
+ return p4d.p4d;
+}
#else
#include <asm-generic/pgtable-nop4d.h>
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 38b6daf72deb..d26b066944a5 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -81,6 +81,14 @@ void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
tlb_remove_page(tlb, virt_to_page(pud));
}
+
+#if CONFIG_PGTABLE_LEVELS > 4
+void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
+{
+ paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
+ tlb_remove_page(tlb, virt_to_page(p4d));
+}
+#endif /* CONFIG_PGTABLE_LEVELS > 4 */
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
@@ -120,7 +128,7 @@ static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)
references from swapper_pg_dir. */
if (CONFIG_PGTABLE_LEVELS == 2 ||
(CONFIG_PGTABLE_LEVELS == 3 && SHARED_KERNEL_PMD) ||
- CONFIG_PGTABLE_LEVELS == 4) {
+ CONFIG_PGTABLE_LEVELS >= 4) {
clone_pgd_range(pgd + KERNEL_PGD_BOUNDARY,
swapper_pg_dir + KERNEL_PGD_BOUNDARY,
KERNEL_PGD_PTRS);
@@ -582,6 +590,30 @@ void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
}
#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+#ifdef CONFIG_X86_5LEVEL
+/**
+ * p4d_set_huge - setup kernel P4D mapping
+ *
+ * No 512GB pages yet -- always return 0
+ *
+ * Returns 1 on success and 0 on failure.
+ */
+int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
+{
+ return 0;
+}
+
+/**
+ * p4d_clear_huge - clear kernel P4D mapping when it is set
+ *
+ * No 512GB pages yet -- always return 0
+ */
+int p4d_clear_huge(p4d_t *p4d)
+{
+ return 0;
+}
+#endif
+
/**
* pud_set_huge - setup kernel PUD mapping
*
--
2.11.0
next prev parent reply other threads:[~2017-03-27 16:31 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-27 16:29 [PATCH 0/8] x86: 5-level paging enabling for v4.12, Part 3 Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 1/8] x86/boot: Detect 5-level paging support Kirill A. Shutemov
2017-03-28 6:06 ` Ingo Molnar
2017-03-28 10:45 ` [PATCHv2 " Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 2/8] x86/asm: Remove __VIRTUAL_MASK_SHIFT==47 assert Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 3/8] x86/mm: Define virtual memory map for 5-level paging Kirill A. Shutemov
2017-03-28 22:21 ` H. Peter Anvin
2017-03-28 22:47 ` Kirill A. Shutemov
2017-03-29 13:20 ` [PATCHv2 " Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 4/8] x86/paravirt: Make paravirt code support " Kirill A. Shutemov
2017-03-27 16:29 ` Kirill A. Shutemov [this message]
2017-03-28 6:11 ` [PATCH 5/8] x86/mm: Add basic defines/helpers for CONFIG_X86_5LEVEL Ingo Molnar
2017-03-28 10:46 ` [PATCHv2 " Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 6/8] x86/dump_pagetables: Add support 5-level paging Kirill A. Shutemov
2017-03-28 6:12 ` Ingo Molnar
2017-03-28 9:30 ` Kirill A. Shutemov
2017-03-28 9:39 ` Ingo Molnar
2017-03-28 10:48 ` [PATCHv2 " Kirill A. Shutemov
2017-03-28 18:55 ` Borislav Petkov
2017-03-28 21:15 ` Kirill A. Shutemov
2017-03-28 21:38 ` Borislav Petkov
2017-03-29 15:00 ` Kirill A. Shutemov
2017-03-30 6:22 ` Ingo Molnar
2017-03-30 7:28 ` [tip:x86/mm] x86/dump_pagetables: Add support for " tip-bot for Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 7/8] x86/kasan: Extend to support " Kirill A. Shutemov
2017-03-27 16:29 ` [PATCH 8/8] x86/espfix: Add " Kirill A. Shutemov
2017-03-29 13:22 ` [PATCHv2 " Kirill A. Shutemov
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