linux-kernel - Re: [RFC PATCH v2 7/7] KVM: KVM: don't break vcpu 'halt' state due to apfs

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Message-ID: <4CCFDA28.4070003@cn.fujitsu.com>
Date:	Tue, 02 Nov 2010 17:30:16 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [RFC PATCH v2 7/7] KVM: KVM: don't break vcpu 'halt' state due
 to apfs

On 11/02/2010 05:14 PM, Gleb Natapov wrote:

> If irqchip is in userspace apf is disabled (see mmu.c:can_do_async_pf()).
> The reason for this is that when irqchip_in_kernel(v->kvm) cpu sleeps in
> userspace during halt, so all event that can cause it to be unhalted
> should be generated in userspace too. This is also the reason you can't have
> pit in kernel and irqchip in userpsace.
> 

Oh, thank you very much for answering so many questions, and your patch is
looks good for me! ;-)
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