Commit-ID: a7c4c0d934c6cbc58de262d090d4a715445453f0
Gitweb: http://git.kernel.org/tip/a7c4c0d934c6cbc58de262d090d4a715445453f0
Author: H. Peter Anvin <hpa@xxxxxxxxx>
AuthorDate: Fri, 13 Nov 2009 15:28:14 -0800
Committer: H. Peter Anvin <hpa@xxxxxxxxx>
CommitDate: Mon, 16 Nov 2009 13:44:57 -0800
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@xxxxxxxxx>
Acked-by: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Pavel Machek <pavel@xxxxxx>
Cc: Nigel Cunningham <nigel@xxxxxxxxxxxx>
LKML-Reference: <1258154897-6770-3-git-send-email-hpa@xxxxxxxxx>
Acked-by: Kees Cook <kees.cook@xxxxxxxxxxxxx>
---
arch/x86/kernel/acpi/sleep.c | 9 +++------
1 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 4a41145..82e5086 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();
--
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