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

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Date:   Mon,  4 May 2020 16:58:04 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     pbonzini@...hat.com, konrad.wilk@...cle.com,
        jan.setjeeilers@...cle.com, liran.alon@...cle.com,
        junaids@...gle.com, graf@...zon.de, rppt@...ux.vnet.ibm.com,
        kuzuno@...il.com, mgross@...ux.intel.com,
        alexandre.chartre@...cle.com
Subject: [RFC v4][PATCH part-2 07/13] mm/dpt: Helper functions to map module into a decorated page-table

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

Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
---
 arch/x86/include/asm/dpt.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

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
-- 
2.18.2