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From: Steven Price <steven.price@arm.com>
To: linux-mm@kvack.org
Cc: "Steven Price" <steven.price@arm.com>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
	"Arnd Bergmann" <arnd@arndb.de>, "Borislav Petkov" <bp@alien8.de>,
	"Catalin Marinas" <catalin.marinas@arm.com>,
	"Dave Hansen" <dave.hansen@linux.intel.com>,
	"Ingo Molnar" <mingo@redhat.com>,
	"James Morse" <james.morse@arm.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Will Deacon" <will.deacon@arm.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	"Mark Rutland" <Mark.Rutland@arm.com>,
	"Liang, Kan" <kan.liang@linux.intel.com>
Subject: [PATCH v5 17/19] x86: mm: Convert ptdump_walk_pgd_level_debugfs() to take an mm_struct
Date: Thu, 21 Mar 2019 14:19:51 +0000	[thread overview]
Message-ID: <20190321141953.31960-18-steven.price@arm.com> (raw)
In-Reply-To: <20190321141953.31960-1-steven.price@arm.com>

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.

Signed-off-by: Steven Price <steven.price@arm.com>
---
 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 579959750f34..5abf693dc9b2 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -28,7 +28,8 @@ 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 cd84f067e41d..824131052574 100644
--- a/arch/x86/mm/debug_pagetables.c
+++ b/arch/x86/mm/debug_pagetables.c
@@ -6,7 +6,7 @@
 
 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;
 }
 
@@ -16,7 +16,7 @@ static int ptdump_curknl_show(struct seq_file *m, void *v)
 {
 	if (current->mm->pgd) {
 		down_read(&current->mm->mmap_sem);
-		ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, false);
+		ptdump_walk_pgd_level_debugfs(m, current->mm, false);
 		up_read(&current->mm->mmap_sem);
 	}
 	return 0;
@@ -31,7 +31,7 @@ static int ptdump_curusr_show(struct seq_file *m, void *v)
 {
 	if (current->mm->pgd) {
 		down_read(&current->mm->mmap_sem);
-		ptdump_walk_pgd_level_debugfs(m, current->mm->pgd, true);
+		ptdump_walk_pgd_level_debugfs(m, current->mm, true);
 		up_read(&current->mm->mmap_sem);
 	}
 	return 0;
@@ -46,7 +46,7 @@ static struct dentry *pe_efi;
 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 ddf8ea6b059d..40b3f1da6e15 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -525,16 +525,12 @@ 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)
@@ -579,8 +575,10 @@ 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 && static_cpu_has(X86_FEATURE_PTI))
 		pgd = kernel_to_user_pgdp(pgd);
@@ -606,7 +604,7 @@ 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)
-- 
2.20.1


  parent reply	other threads:[~2019-03-21 14:21 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-21 14:19 [PATCH v5 00/19] Convert x86 & arm64 to use generic page walk Steven Price
2019-03-21 14:19 ` [PATCH v5 01/19] arc: mm: Add p?d_large() definitions Steven Price
2019-03-21 14:19 ` [PATCH v5 02/19] arm64: " Steven Price
2019-03-21 14:19 ` [PATCH v5 03/19] mips: " Steven Price
2019-03-21 14:19 ` [PATCH v5 04/19] powerpc: " Steven Price
2019-03-21 14:19 ` [PATCH v5 05/19] riscv: " Steven Price
2019-03-21 14:19 ` [PATCH v5 06/19] s390: " Steven Price
2019-03-21 14:19 ` [PATCH v5 07/19] sparc: " Steven Price
2019-03-21 14:19 ` [PATCH v5 08/19] x86: " Steven Price
2019-03-21 14:19 ` [PATCH v5 09/19] mm: Add generic p?d_large() macros Steven Price
2019-03-21 14:19 ` [PATCH v5 10/19] mm: pagewalk: Add p4d_entry() and pgd_entry() Steven Price
2019-03-21 21:15   ` Mike Rapoport
2019-03-22 10:11     ` Steven Price
2019-03-22 10:29       ` Mike Rapoport
2019-03-22 10:37         ` Steven Price
2019-03-21 14:19 ` [PATCH v5 11/19] mm: pagewalk: Allow walking without vma Steven Price
2019-03-21 14:19 ` [PATCH v5 12/19] mm: pagewalk: Add test_p?d callbacks Steven Price
2019-03-21 14:19 ` [PATCH v5 13/19] arm64: mm: Convert mm/dump.c to use walk_page_range() Steven Price
2019-03-21 14:19 ` [PATCH v5 14/19] x86: mm: Don't display pages which aren't present in debugfs Steven Price
2019-03-21 14:19 ` [PATCH v5 15/19] x86: mm: Point to struct seq_file from struct pg_state Steven Price
2019-03-21 14:19 ` [PATCH v5 16/19] x86: mm+efi: Convert ptdump_walk_pgd_level() to take a mm_struct Steven Price
2019-03-21 14:19 ` Steven Price [this message]
2019-03-21 14:19 ` [PATCH v5 18/19] x86: mm: Convert ptdump_walk_pgd_level_core() to take an mm_struct Steven Price
2019-03-21 14:19 ` [PATCH v5 19/19] x86: mm: Convert dump_pagetables to use walk_page_range Steven Price

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