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    Subject[PATCH 26 of 38] xen: forcibly disable PAT support
    Date
    From
    From: Ian Campbell <ian.campbell@citrix.com>

    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@citrix.com>
    ---
    arch/x86/include/asm/pat.h | 4 ++--
    arch/x86/xen/enlighten.c | 3 +++
    2 files changed, 5 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
    --- a/arch/x86/include/asm/pat.h
    +++ b/arch/x86/include/asm/pat.h
    @@ -6,9 +6,11 @@
    #ifdef CONFIG_X86_PAT
    extern int pat_enabled;
    extern void validate_pat_support(struct cpuinfo_x86 *c);
    +extern void pat_disable(char *reason);
    #else
    static const int pat_enabled;
    static inline void validate_pat_support(struct cpuinfo_x86 *c) { }
    +static inline void pat_disable(char *reason) { }
    #endif

    extern void pat_init(void);
    @@ -17,6 +19,4 @@
    unsigned long req_type, unsigned long *ret_type);
    extern int free_memtype(u64 start, u64 end);

    -extern void pat_disable(char *reason);
    -
    #endif /* _ASM_X86_PAT_H */
    diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
    --- 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"
    @@ -1743,6 +1744,8 @@
    add_preferred_console("hvc", 0, NULL);
    }

    + pat_disable("PAT disabled on Xen");
    +
    xen_raw_console_write("about to get started...\n");

    /* Start the world */



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