linux-kernel - [PATCH 1/2] Extend VVAR support to multiple pages

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Date:	Mon, 19 Dec 2011 11:51:32 -0800
From:	Arun Sharma <asharma@...com>
To:	linux-kernel@...r.kernel.org
Cc:	Arun Sharma <asharma@...com>, Kumar Sundararajan <kumar@...com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	john stultz <johnstul@...ibm.com>,
	Andy Lutomirski <luto@....EDU>
Subject: [PATCH 1/2] Extend VVAR support to multiple pages

Signed-off-by: Arun Sharma <asharma@...com>
Cc: Kumar Sundararajan <kumar@...com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: john stultz <johnstul@...ibm.com>
Cc: Andy Lutomirski <luto@....EDU>
Cc: linux-kernel@...r.kernel.org
---
 arch/x86/include/asm/fixmap.h |    1 +
 arch/x86/include/asm/vvar.h   |    3 ++-
 arch/x86/kernel/vmlinux.lds.S |    2 +-
 arch/x86/kernel/vsyscall_64.c |    1 +
 4 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index 460c74e..6441527 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -78,6 +78,7 @@ enum fixed_addresses {
 	VSYSCALL_LAST_PAGE,
 	VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
 			    + ((VSYSCALL_END-VSYSCALL_START) >> PAGE_SHIFT) - 1,
+	VVAR_PAGE2,
 	VVAR_PAGE,
 	VSYSCALL_HPET,
 #endif
diff --git a/arch/x86/include/asm/vvar.h b/arch/x86/include/asm/vvar.h
index de656ac..0fd7a4a 100644
--- a/arch/x86/include/asm/vvar.h
+++ b/arch/x86/include/asm/vvar.h
@@ -17,7 +17,8 @@
  */
 
 /* Base address of vvars.  This is not ABI. */
-#define VVAR_ADDRESS (-10*1024*1024 - 4096)
+#define VVAR_NUM_PAGES 2
+#define VVAR_ADDRESS (-10*1024*1024 - VVAR_NUM_PAGES * 4096)
 
 #if defined(__VVAR_KERNEL_LDS)
 
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 0f703f1..70c52de 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -171,7 +171,7 @@ SECTIONS
 
 	} :data
 
-       . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
+       . = ALIGN(__vvar_page + VVAR_NUM_PAGES*PAGE_SIZE, PAGE_SIZE);
 
 #endif /* CONFIG_X86_64 */
 
diff --git a/arch/x86/kernel/vsyscall_64.c b/arch/x86/kernel/vsyscall_64.c
index e4d4a22..7960d3a 100644
--- a/arch/x86/kernel/vsyscall_64.c
+++ b/arch/x86/kernel/vsyscall_64.c
@@ -282,6 +282,7 @@ void __init map_vsyscall(void)
 		     (unsigned long)VSYSCALL_START);
 
 	__set_fixmap(VVAR_PAGE, physaddr_vvar_page, PAGE_KERNEL_VVAR);
+	__set_fixmap(VVAR_PAGE2, physaddr_vvar_page + PAGE_SIZE, PAGE_KERNEL_VVAR);
 	BUILD_BUG_ON((unsigned long)__fix_to_virt(VVAR_PAGE) !=
 		     (unsigned long)VVAR_ADDRESS);
 }
-- 
1.7.4

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