linux-kernel - Re: [PATCH v6 02/12] Halt vcpu if page it tries to access is swapped out.

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Message-ID: <4CADCB4E.60509@redhat.com>
Date:	Thu, 07 Oct 2010 15:29:50 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Rik van Riel <riel@...hat.com>
CC:	Gleb Natapov <gleb@...hat.com>, kvm@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, hpa@...or.com,
	cl@...ux-foundation.org, mtosatti@...hat.com
Subject: Re: [PATCH v6 02/12] Halt vcpu if page it tries to access is swapped
 out.

  On 10/07/2010 03:24 PM, Rik van Riel wrote:
> On 10/07/2010 05:50 AM, Avi Kivity wrote:
>
>>> +static bool can_do_async_pf(struct kvm_vcpu *vcpu)
>>> +{
>>> + if (unlikely(!irqchip_in_kernel(vcpu->kvm) ||
>>> + kvm_event_needs_reinjection(vcpu)))
>>> + return false;
>>> +
>>> + return kvm_x86_ops->interrupt_allowed(vcpu);
>>> +}
>>
>> Strictly speaking, if the cpu can handle NMIs it can take an apf?
>
> Strictly speaking, yes.
>
> However, it may not be able to DO anything with it, since
> it won't be able to reschedule the context it's running :)
>

I was thinking about keeping the watchdog nmi handler responsive.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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