From c5cfae12fdd50809b16482c13a94fa6cf1e45b31 Mon Sep 17 00:00:00 2001 From: Steven Price Date: Mon, 3 Feb 2020 17:36:16 -0800 Subject: [PATCH] x86: mm: convert ptdump_walk_pgd_level_debugfs() to take an mm_struct To enable x86 to use the generic walk_page_range() function, the callers of ptdump_walk_pgd_level_debugfs() need to pass in the mm_struct. This means that ptdump_walk_pgd_level_core() is now always passed a valid pgd, so drop the support for pgd==NULL. Link: http://lkml.kernel.org/r/20191218162402.45610-19-steven.price@arm.com Signed-off-by: Steven Price Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andy Lutomirski Cc: Ard Biesheuvel Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Borislav Petkov Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Dave Hansen Cc: David S. Miller Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Ingo Molnar Cc: James Hogan Cc: James Morse Cc: Jerome Glisse Cc: "Liang, Kan" Cc: Mark Rutland Cc: Michael Ellerman Cc: Paul Burton Cc: Paul Mackerras Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Ralf Baechle Cc: Russell King Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Cc: Zong Li Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/include/asm/pgtable.h | 3 ++- arch/x86/mm/debug_pagetables.c | 8 ++++---- arch/x86/mm/dump_pagetables.c | 14 ++++++-------- 3 files changed, 12 insertions(+), 13 deletions(-) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 5a30bf58156e..7e118660bbd9 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -30,7 +30,8 @@ extern pgd_t early_top_pgt[PTRS_PER_PGD]; int __init __early_make_pgtable(unsigned long address, pmdval_t pmd); void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm); -void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user); +void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm, + bool user); void ptdump_walk_pgd_level_checkwx(void); void ptdump_walk_user_pgd_level_checkwx(void); diff --git a/arch/x86/mm/debug_pagetables.c b/arch/x86/mm/debug_pagetables.c index 39001a401eff..d0efec713c6c 100644 --- a/arch/x86/mm/debug_pagetables.c +++ b/arch/x86/mm/debug_pagetables.c @@ -7,7 +7,7 @@ static int ptdump_show(struct seq_file *m, void *v) { - ptdump_walk_pgd_level_debugfs(m, NULL, false); + ptdump_walk_pgd_level_debugfs(m, &init_mm, false); return 0; } @@ -17,7 +17,7 @@ static int ptdump_curknl_show(struct seq_file *m, void *v) { if (current->mm->pgd) { down_read(¤t->mm->mmap_sem); - ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, false); + ptdump_walk_pgd_level_debugfs(m, current->mm, false); up_read(¤t->mm->mmap_sem); } return 0; @@ -30,7 +30,7 @@ static int ptdump_curusr_show(struct seq_file *m, void *v) { if (current->mm->pgd) { down_read(¤t->mm->mmap_sem); - ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, true); + ptdump_walk_pgd_level_debugfs(m, current->mm, true); up_read(¤t->mm->mmap_sem); } return 0; @@ -43,7 +43,7 @@ DEFINE_SHOW_ATTRIBUTE(ptdump_curusr); static int ptdump_efi_show(struct seq_file *m, void *v) { if (efi_mm.pgd) - ptdump_walk_pgd_level_debugfs(m, efi_mm.pgd, false); + ptdump_walk_pgd_level_debugfs(m, &efi_mm, false); return 0; } diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c index 24fe76325b31..2f5f32f21f81 100644 --- a/arch/x86/mm/dump_pagetables.c +++ b/arch/x86/mm/dump_pagetables.c @@ -518,16 +518,12 @@ static inline bool is_hypervisor_range(int idx) static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd, bool checkwx, bool dmesg) { - pgd_t *start = INIT_PGD; + pgd_t *start = pgd; pgprotval_t prot, eff; int i; struct pg_state st = {}; - if (pgd) { - start = pgd; - st.to_dmesg = dmesg; - } - + st.to_dmesg = dmesg; st.check_wx = checkwx; st.seq = m; if (checkwx) @@ -572,8 +568,10 @@ void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm) ptdump_walk_pgd_level_core(m, mm->pgd, false, true); } -void ptdump_walk_pgd_level_debugfs(struct seq_file *m, pgd_t *pgd, bool user) +void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm, + bool user) { + pgd_t *pgd = mm->pgd; #ifdef CONFIG_PAGE_TABLE_ISOLATION if (user && boot_cpu_has(X86_FEATURE_PTI)) pgd = kernel_to_user_pgdp(pgd); @@ -599,7 +597,7 @@ void ptdump_walk_user_pgd_level_checkwx(void) void ptdump_walk_pgd_level_checkwx(void) { - ptdump_walk_pgd_level_core(NULL, NULL, true, false); + ptdump_walk_pgd_level_core(NULL, INIT_PGD, true, false); } static int __init pt_dump_init(void) -- 2.39.5