[RFC,v4,part-2,07/13] mm/dpt: Helper functions to map module into a decorated page-table

Commit Message

Alexandre Chartre May 4, 2020, 2:58 p.m. UTC

Add helper functions to easily map a module into a decorated page-table.

Signed-off-by: Alexandre Chartre <[e-mail]>
---
 arch/x86/include/asm/dpt.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

Patch

diff --git a/arch/x86/include/asm/dpt.h b/arch/x86/include/asm/dpt.h
index 85d2c5051acb..5a38d97a70a8 100644
--- a/arch/x86/include/asm/dpt.h
+++ b/arch/x86/include/asm/dpt.h
@@ -2,6 +2,7 @@ 
 #ifndef ARCH_X86_MM_DPT_H
 #define ARCH_X86_MM_DPT_H
 
+#include <linux/module.h>
 #include <linux/spinlock.h>
 #include <linux/xarray.h>
 
@@ -44,4 +45,24 @@  extern int dpt_map_range(struct dpt *dpt, void *ptr, size_t size,
 			 enum page_table_level level);
 extern int dpt_map(struct dpt *dpt, void *ptr, unsigned long size);
 
+static inline int dpt_map_module(struct dpt *dpt, char *module_name)
+{
+	struct module *module;
+
+	module = find_module(module_name);
+	if (!module)
+		return -ESRCH;
+
+	return dpt_map(dpt, module->core_layout.base, module->core_layout.size);
+}
+
+/*
+ * Copy the memory mapping for the current module. This is defined as a
+ * macro to ensure it is expanded in the module making the call so that
+ * THIS_MODULE has the correct value.
+ */
+#define DPT_MAP_THIS_MODULE(dpt)			\
+	(dpt_map(dpt, THIS_MODULE->core_layout.base,	\
+		 THIS_MODULE->core_layout.size))
+
 #endif