Re: [PATCH] KVM: VMX: Leave atomic context while emulating real mode

[Laurent Vivier <Laurent.Vivier@bull.net>]

Le mercredi 20 août 2008 à 14:01 +0000, Avi Kivity a écrit :
> From: Avi Kivity <avi@qumranet.com>
> 
> Emulation requires access to user memory, and potentially schedules.
> 
> Signed-off-by: Avi Kivity <avi@qumranet.com>
> 
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index d5d25a2..81c121c 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -2911,6 +2911,9 @@ static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
>  	struct vcpu_vmx *vmx = to_vmx(vcpu);
>  	int err;
>  
> +	preempt_enable();
> +	local_irq_enable();
> +
>  	while (!guest_state_valid(vcpu)) {
>  		err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);
>  
> @@ -2932,6 +2935,9 @@ static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
>  			schedule();
>  	}
>  
> +	local_irq_disable();
> +	preempt_enable();

should be a preempt_disable() ?

>  	/* Guest state should be valid now, no more emulation should be needed */
>  	vmx->emulation_required = 0;
>  }
> --
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-- 
----------------- Laurent.Vivier@bull.net  ------------------
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