From: Steven Price <steven.price@xxxxxxx> Subject: 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/20191028135910.33253-18-steven.price@xxxxxxx Signed-off-by: Steven Price <steven.price@xxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx> Cc: Alexander Potapenko <glider@xxxxxxxxxx> Cc: Alexandre Ghiti <alex@xxxxxxxx> Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: Dave Jiang <dave.jiang@xxxxxxxxx> Cc: David S. Miller <davem@xxxxxxxxxxxxx> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: James Hogan <jhogan@xxxxxxxxxx> Cc: James Morse <james.morse@xxxxxxx> Cc: "Liang, Kan" <kan.liang@xxxxxxxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> Cc: Palmer Dabbelt <palmer@xxxxxxxxxx> Cc: Paul Burton <paul.burton@xxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: Russell King <linux@xxxxxxxxxxxxxxx> Cc: Shiraz Hashim <shashim@xxxxxxxxxxxxxx> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx> Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Zong Li <zong.li@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- 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(-) --- a/arch/x86/include/asm/pgtable.h~x86-mm-convert-ptdump_walk_pgd_level_debugfs-to-take-an-mm_struct +++ a/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); --- a/arch/x86/mm/debug_pagetables.c~x86-mm-convert-ptdump_walk_pgd_level_debugfs-to-take-an-mm_struct +++ a/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 { 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 { 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; } --- a/arch/x86/mm/dump_pagetables.c~x86-mm-convert-ptdump_walk_pgd_level_debugfs-to-take-an-mm_struct +++ a/arch/x86/mm/dump_pagetables.c @@ -518,16 +518,12 @@ static inline bool is_hypervisor_range(i 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_fi 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 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) _
