EFER varies like %cr4 depending on the cpu capabilities, and which cpu
capabilities we want to make use of. So save/restore it make certain
we have the same EFER value when we are done.
Signed-off-by: Eric W. Biederman <[email protected]>
Signed-off-by: Vivek Goyal <[email protected]>
---
arch/x86_64/kernel/suspend.c | 3 ++-
include/asm-x86_64/suspend.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/suspend.c~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state arch/x86_64/kernel/suspend.c
--- linux-2.6.19-rc6-reloc/arch/x86_64/kernel/suspend.c~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state 2006-11-17 00:08:16.000000000 -0500
+++ linux-2.6.19-rc6-reloc-root/arch/x86_64/kernel/suspend.c 2006-11-17 00:08:16.000000000 -0500
@@ -33,7 +33,6 @@ void __save_processor_state(struct saved
asm volatile ("str %0" : "=m" (ctxt->tr));
/* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
- /* EFER should be constant for kernel version, no need to handle it. */
/*
* segment registers
*/
@@ -50,6 +49,7 @@ void __save_processor_state(struct saved
/*
* control registers
*/
+ rdmsrl(MSR_EFER, ctxt->efer);
asm volatile ("movq %%cr0, %0" : "=r" (ctxt->cr0));
asm volatile ("movq %%cr2, %0" : "=r" (ctxt->cr2));
asm volatile ("movq %%cr3, %0" : "=r" (ctxt->cr3));
@@ -75,6 +75,7 @@ void __restore_processor_state(struct sa
/*
* control registers
*/
+ wrmsrl(MSR_EFER, ctxt->efer);
asm volatile ("movq %0, %%cr8" :: "r" (ctxt->cr8));
asm volatile ("movq %0, %%cr4" :: "r" (ctxt->cr4));
asm volatile ("movq %0, %%cr3" :: "r" (ctxt->cr3));
diff -puN include/asm-x86_64/suspend.h~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state include/asm-x86_64/suspend.h
--- linux-2.6.19-rc6-reloc/include/asm-x86_64/suspend.h~x86_64-Add-EFER-to-the-set-registers-saved-by-save_processor_state 2006-11-17 00:08:16.000000000 -0500
+++ linux-2.6.19-rc6-reloc-root/include/asm-x86_64/suspend.h 2006-11-17 00:08:16.000000000 -0500
@@ -17,6 +17,7 @@ struct saved_context {
u16 ds, es, fs, gs, ss;
unsigned long gs_base, gs_kernel_base, fs_base;
unsigned long cr0, cr2, cr3, cr4, cr8;
+ unsigned long efer;
u16 gdt_pad;
u16 gdt_limit;
unsigned long gdt_base;
_
-
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