linux-kernel - [PATCH 15/25][V3] introducing paravirt_activate

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Date:	Wed, 15 Aug 2007 09:49:35 -0300
From:	Glauber de Oliveira Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, rusty@...tcorp.com.au, ak@...e.de,
	mingo@...e.hu, chrisw@...s-sol.org, jeremy@...p.org,
	avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, lguest@...abs.org,
	glommer@...il.com, Glauber de Oliveira Costa <gcosta@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 15/25][V3] introducing paravirt_activate_mm

This function/macro will allow a paravirt guest to be notified we changed
the current task cr3, and act upon it. It's up to them

Signed-off-by: Glauber de Oliveira Costa <gcosta@...hat.com>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 include/asm-x86_64/mmu_context.h |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/include/asm-x86_64/mmu_context.h b/include/asm-x86_64/mmu_context.h
index 9592698..77ce047 100644
--- a/include/asm-x86_64/mmu_context.h
+++ b/include/asm-x86_64/mmu_context.h
@@ -7,7 +7,16 @@
 #include <asm/pda.h>
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
+
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
 #include <asm-generic/mm_hooks.h>
+static inline void paravirt_activate_mm(struct mm_struct *prev,
+					struct mm_struct *next)
+{
+}
+#endif /* CONFIG_PARAVIRT */
 
 /*
  * possibly do the LDT unload here?
@@ -67,8 +76,10 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	asm volatile("movl %0,%%fs"::"r"(0));  \
 } while(0)
 
-#define activate_mm(prev, next) \
-	switch_mm((prev),(next),NULL)
-
+#define activate_mm(prev, next) 		\
+do {						\
+	paravirt_activate_mm(prev, next);	\
+	switch_mm((prev),(next),NULL);		\
+} while (0)
 
 #endif
-- 
1.4.4.2

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