[v11,3/9] set_memory: allow set_direct_map_*_noflush() for multiple pages
diff mbox series

Message ID 20201124092556.12009-4-rppt@kernel.org
State New, archived
Headers show
Series
  • mm: introduce memfd_secret system call to create "secret" memory areas
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Commit Message

Mike Rapoport Nov. 24, 2020, 9:25 a.m. UTC
From: Mike Rapoport <rppt@linux.ibm.com>

The underlying implementations of set_direct_map_invalid_noflush() and
set_direct_map_default_noflush() allow updating multiple contiguous pages
at once.

Add numpages parameter to set_direct_map_*_noflush() to expose this ability
with these APIs.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>	# arm64
---
 arch/arm64/include/asm/cacheflush.h |  4 ++--
 arch/arm64/mm/pageattr.c            | 10 ++++++----
 arch/riscv/include/asm/set_memory.h |  4 ++--
 arch/riscv/mm/pageattr.c            |  8 ++++----
 arch/x86/include/asm/set_memory.h   |  4 ++--
 arch/x86/mm/pat/set_memory.c        |  8 ++++----
 include/linux/set_memory.h          |  4 ++--
 kernel/power/snapshot.c             |  4 ++--
 mm/vmalloc.c                        |  5 +++--
 9 files changed, 27 insertions(+), 24 deletions(-)

Patch
diff mbox series

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 45217f21f1fe..d3598419a284 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -138,8 +138,8 @@  static __always_inline void __flush_icache_all(void)
 
 int set_memory_valid(unsigned long addr, int numpages, int enable);
 
-int set_direct_map_invalid_noflush(struct page *page);
-int set_direct_map_default_noflush(struct page *page);
+int set_direct_map_invalid_noflush(struct page *page, int numpages);
+int set_direct_map_default_noflush(struct page *page, int numpages);
 bool kernel_page_present(struct page *page);
 
 #include <asm-generic/cacheflush.h>
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index 92eccaf595c8..b53ef37bf95a 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -148,34 +148,36 @@  int set_memory_valid(unsigned long addr, int numpages, int enable)
 					__pgprot(PTE_VALID));
 }
 
-int set_direct_map_invalid_noflush(struct page *page)
+int set_direct_map_invalid_noflush(struct page *page, int numpages)
 {
 	struct page_change_data data = {
 		.set_mask = __pgprot(0),
 		.clear_mask = __pgprot(PTE_VALID),
 	};
+	unsigned long size = PAGE_SIZE * numpages;
 
 	if (!debug_pagealloc_enabled() && !rodata_full)
 		return 0;
 
 	return apply_to_page_range(&init_mm,
 				   (unsigned long)page_address(page),
-				   PAGE_SIZE, change_page_range, &data);
+				   size, change_page_range, &data);
 }
 
-int set_direct_map_default_noflush(struct page *page)
+int set_direct_map_default_noflush(struct page *page, int numpages)
 {
 	struct page_change_data data = {
 		.set_mask = __pgprot(PTE_VALID | PTE_WRITE),
 		.clear_mask = __pgprot(PTE_RDONLY),
 	};
+	unsigned long size = PAGE_SIZE * numpages;
 
 	if (!debug_pagealloc_enabled() && !rodata_full)
 		return 0;
 
 	return apply_to_page_range(&init_mm,
 				   (unsigned long)page_address(page),
-				   PAGE_SIZE, change_page_range, &data);
+				   size, change_page_range, &data);
 }
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
diff --git a/arch/riscv/include/asm/set_memory.h b/arch/riscv/include/asm/set_memory.h
index d690b08dff2a..92b9bb26bf5e 100644
--- a/arch/riscv/include/asm/set_memory.h
+++ b/arch/riscv/include/asm/set_memory.h
@@ -22,8 +22,8 @@  static inline int set_memory_x(unsigned long addr, int numpages) { return 0; }
 static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
 #endif
 
-int set_direct_map_invalid_noflush(struct page *page);
-int set_direct_map_default_noflush(struct page *page);
+int set_direct_map_invalid_noflush(struct page *page, int numpages);
+int set_direct_map_default_noflush(struct page *page, int numpages);
 bool kernel_page_present(struct page *page);
 
 #endif /* __ASSEMBLY__ */
diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c
index 87ba5a68bbb8..0454f2d052c4 100644
--- a/arch/riscv/mm/pageattr.c
+++ b/arch/riscv/mm/pageattr.c
@@ -150,11 +150,11 @@  int set_memory_nx(unsigned long addr, int numpages)
 	return __set_memory(addr, numpages, __pgprot(0), __pgprot(_PAGE_EXEC));
 }
 
-int set_direct_map_invalid_noflush(struct page *page)
+int set_direct_map_invalid_noflush(struct page *page, int numpages)
 {
 	int ret;
 	unsigned long start = (unsigned long)page_address(page);
-	unsigned long end = start + PAGE_SIZE;
+	unsigned long end = start + PAGE_SIZE * numpages;
 	struct pageattr_masks masks = {
 		.set_mask = __pgprot(0),
 		.clear_mask = __pgprot(_PAGE_PRESENT)
@@ -167,11 +167,11 @@  int set_direct_map_invalid_noflush(struct page *page)
 	return ret;
 }
 
-int set_direct_map_default_noflush(struct page *page)
+int set_direct_map_default_noflush(struct page *page, int numpages)
 {
 	int ret;
 	unsigned long start = (unsigned long)page_address(page);
-	unsigned long end = start + PAGE_SIZE;
+	unsigned long end = start + PAGE_SIZE * numpages;
 	struct pageattr_masks masks = {
 		.set_mask = PAGE_KERNEL,
 		.clear_mask = __pgprot(0)
diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h
index 4352f08bfbb5..6224cb291f6c 100644
--- a/arch/x86/include/asm/set_memory.h
+++ b/arch/x86/include/asm/set_memory.h
@@ -80,8 +80,8 @@  int set_pages_wb(struct page *page, int numpages);
 int set_pages_ro(struct page *page, int numpages);
 int set_pages_rw(struct page *page, int numpages);
 
-int set_direct_map_invalid_noflush(struct page *page);
-int set_direct_map_default_noflush(struct page *page);
+int set_direct_map_invalid_noflush(struct page *page, int numpages);
+int set_direct_map_default_noflush(struct page *page, int numpages);
 bool kernel_page_present(struct page *page);
 
 extern int kernel_set_to_readonly;
diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c
index 16f878c26667..d157fd617c99 100644
--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -2184,14 +2184,14 @@  static int __set_pages_np(struct page *page, int numpages)
 	return __change_page_attr_set_clr(&cpa, 0);
 }
 
-int set_direct_map_invalid_noflush(struct page *page)
+int set_direct_map_invalid_noflush(struct page *page, int numpages)
 {
-	return __set_pages_np(page, 1);
+	return __set_pages_np(page, numpages);
 }
 
-int set_direct_map_default_noflush(struct page *page)
+int set_direct_map_default_noflush(struct page *page, int numpages)
 {
-	return __set_pages_p(page, 1);
+	return __set_pages_p(page, numpages);
 }
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index fe1aa4e54680..c650f82db813 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -15,11 +15,11 @@  static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
 #endif
 
 #ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP
-static inline int set_direct_map_invalid_noflush(struct page *page)
+static inline int set_direct_map_invalid_noflush(struct page *page, int numpages)
 {
 	return 0;
 }
-static inline int set_direct_map_default_noflush(struct page *page)
+static inline int set_direct_map_default_noflush(struct page *page, int numpages)
 {
 	return 0;
 }
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 069576704c57..d40bb6666735 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -89,9 +89,9 @@  static inline void hibernate_map_page(struct page *page, int enable)
 		 * changes and this will no longer be the case.
 		 */
 		if (enable)
-			ret = set_direct_map_default_noflush(page);
+			ret = set_direct_map_default_noflush(page, 1);
 		else
-			ret = set_direct_map_invalid_noflush(page);
+			ret = set_direct_map_invalid_noflush(page, 1);
 
 		if (ret) {
 			pr_warn_once("Failed to remap page\n");
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d7075ad340aa..7e903524e002 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2179,13 +2179,14 @@  struct vm_struct *remove_vm_area(const void *addr)
 }
 
 static inline void set_area_direct_map(const struct vm_struct *area,
-				       int (*set_direct_map)(struct page *page))
+				       int (*set_direct_map)(struct page *page,
+							     int numpages))
 {
 	int i;
 
 	for (i = 0; i < area->nr_pages; i++)
 		if (page_address(area->pages[i]))
-			set_direct_map(area->pages[i]);
+			set_direct_map(area->pages[i], 1);
 }
 
 /* Handle removing and resetting vm mappings related to the vm_struct. */