linux-kernel - Re: [PATCH][RFC] kvm-scheduler integration

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Date:	Mon, 09 Jul 2007 16:50:01 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Avi Kivity <avi@...ranet.com>
Cc:	kvm-devel@...ts.sourceforge.net, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] kvm-scheduler integration

On Sun, 2007-07-08 at 20:58 +0800, Avi Kivity wrote:
> The only fly in the ointment is that it crashes quite soon.  Haven't
> figured
> out why yet, but comments on the general direction would be welcome.
Attached patch seems help in my test. prepare_task_switch is called with
irq disabled.


> -static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
> +static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  {
>         u64 phys_addr = __pa(vcpu->vmcs);
> -       int cpu;
>         u64 tsc_this, delta;
> 
> -       cpu = get_cpu();
> -
> +       WARN_ON(!preempt_count());
This and below change will break preempt disabled case. better remove
them.

>         if (vcpu->cpu != cpu)
>                 vcpu_clear(vcpu);
> 
> @@ -426,9 +432,9 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu)
> 
>  static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
>  {
> +       WARN_ON(!preempt_count());
>         vmx_load_host_state(vcpu);
>         kvm_put_guest_fpu(vcpu);
> -       put_cpu();
>  }


View attachment "dbg.patch" of type "text/x-patch" (780 bytes)