From: Ian Campbell <ian.campbell@xxxxxxxxxx>
Xen imposes a particular PAT layout on all paravirtual guests which
does not match the layout Linux would like to use.
Force PAT to be disabled until this is resolved.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
arch/x86/include/asm/pat.h | 5 +++++
arch/x86/mm/pat.c | 5 -----
arch/x86/xen/enlighten.c | 3 +++
3 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index 9709fdf..d8be231 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -5,8 +5,13 @@
#ifdef CONFIG_X86_PAT
extern int pat_enabled;
+extern void pat_disable(const char *reason);
#else
static const int pat_enabled;
+static inline void pat_disable(const char *reason)
+{
+ (void)reason;
+}
#endif
extern void pat_init(void);
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 05f9aef..37df685 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -42,11 +42,6 @@ static int __init nopat(char *str)
return 0;
}
early_param("nopat", nopat);
-#else
-static inline void pat_disable(const char *reason)
-{
- (void)reason;
-}
#endif
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 468aa23..1b89d1c 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -48,6 +48,7 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/reboot.h>
+#include <asm/pat.h>
#include "xen-ops.h"
#include "mmu.h"
@@ -986,6 +987,8 @@ asmlinkage void __init xen_start_kernel(void)
add_preferred_console("hvc", 0, NULL);
}
+ pat_disable("PAT disabled on Xen");
+
xen_raw_console_write("about to get started...\n");
/* Start the world */
--
1.6.0.6
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