linux-kernel - [RFC v2 09/26] mm/asi: Helper functions to map module into ASI

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Message-Id: <1562855138-19507-10-git-send-email-alexandre.chartre@oracle.com>
Date:   Thu, 11 Jul 2019 16:25:21 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        kvm@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     konrad.wilk@...cle.com, jan.setjeeilers@...cle.com,
        liran.alon@...cle.com, jwadams@...gle.com, graf@...zon.de,
        rppt@...ux.vnet.ibm.com, alexandre.chartre@...cle.com
Subject: [RFC v2 09/26] mm/asi: Helper functions to map module into ASI

Add helper functions to easily map a module into an ASI.

Signed-off-by: Alexandre Chartre <alexandre.chartre@...cle.com>
---
 arch/x86/include/asm/asi.h |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/asi.h b/arch/x86/include/asm/asi.h
index 19656aa..b5dbc49 100644
--- a/arch/x86/include/asm/asi.h
+++ b/arch/x86/include/asm/asi.h
@@ -6,6 +6,7 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/module.h>
 #include <linux/spinlock.h>
 #include <asm/pgtable.h>
 #include <linux/xarray.h>
@@ -81,6 +82,26 @@ extern int asi_map_range(struct asi *asi, void *ptr, size_t size,
 extern int asi_map(struct asi *asi, void *ptr, unsigned long 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 ASI_MAP_THIS_MODULE(asi)			\
+	(asi_map(asi, THIS_MODULE->core_layout.base,	\
+		 THIS_MODULE->core_layout.size))
+
+static inline int asi_map_module(struct asi *asi, char *module_name)
+{
+	struct module *module;
+
+	module = find_module(module_name);
+	if (!module)
+		return -ESRCH;
+
+	return asi_map(asi, module->core_layout.base, module->core_layout.size);
+}
+
+/*
  * Function to exit the current isolation. This is used to abort isolation
  * when a task using isolation is scheduled out.
  */
-- 
1.7.1