[RFC][PATCH 2/6] x86/power: Inline write_cr[04]()

From: Peter Zijlstra
Date: Thu Jan 12 2023 - 09:53:48 EST


Since we can't do CALL/RET until GS is restored and CR[04] pinning is
of dubious value in this code path, simply write the stored values.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
---
arch/x86/power/cpu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -208,11 +208,11 @@ static void notrace __restore_processor_
#else
/* CONFIG X86_64 */
native_wrmsrl(MSR_EFER, ctxt->efer);
- native_write_cr4(ctxt->cr4);
+ asm volatile("mov %0,%%cr4": "+r" (ctxt->cr4) : : "memory");
#endif
native_write_cr3(ctxt->cr3);
native_write_cr2(ctxt->cr2);
- native_write_cr0(ctxt->cr0);
+ asm volatile("mov %0,%%cr0": "+r" (ctxt->cr0) : : "memory");

/* Restore the IDT. */
native_load_idt(&ctxt->idt);