x86, sleep: Always save the value of EFER

Always save the value of EFER, regardless of the state of NX.  Since
EFER may not actually exist, use rdmsr_safe() to do so.

v2: check the return value from rdmsr_safe() instead of relying on
    the output values being unchanged on error.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@tuxonice.net>
LKML-Reference: <1258154897-6770-3-git-send-email-hpa@zytor.com>
Acked-by: Kees Cook <kees.cook@canonical.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 4a411450dfa0..82e508677b91 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -78,12 +78,9 @@ int acpi_save_state_mem(void)
 #ifndef CONFIG_64BIT
         store_gdt((struct desc_ptr *)&header->pmode_gdt);
 
-        header->pmode_efer_low = nx_enabled;
-        if (header->pmode_efer_low & 1) {
-                /* This is strange, why not save efer, always? */
-                rdmsr(MSR_EFER, header->pmode_efer_low,
-                        header->pmode_efer_high);
-        }
+        if (rdmsr_safe(MSR_EFER, &header->pmode_efer_low,
+                       &header->pmode_efer_high))
+                header->pmode_efer_low = header->pmode_efer_high = 0;
 #endif /* !CONFIG_64BIT */
 
         header->pmode_cr0 = read_cr0();