On Wed, 2012-04-04 at 15:30 +0300, Gleb Natapov wrote:
>  
> @@ -253,7 +254,10 @@ do_async_page_fault(struct pt_regs *regs, unsigned long 
> error_code)
>               kvm_async_pf_task_wait((u32)read_cr2());
>               break;
>       case KVM_PV_REASON_PAGE_READY:
> +             rcu_irq_enter();
> +             exit_idle();
>               kvm_async_pf_task_wake((u32)read_cr2());
> +             rcu_irq_exit();
>               break;
>       }
>  }

Wouldn't irq_enter() / irq_exit() be more appropriate? You're basically
taking an interrupt/exception from idle, irq_enter() will fix up
everything that needs fixing up, including time sources (which the
scheduler expects to be up-to-date).


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