linux-kernel - Re: [RFC PATCH 1/3] kvm: keep track of which task is running a KVM vcpu

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Date:	Fri, 03 Dec 2010 09:50:14 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Avi Kiviti <avi@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Anthony Liguori <aliguori@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 1/3] kvm: keep track of which task is running a KVM
 vcpu

On 12/02/2010 08:18 PM, Chris Wright wrote:
> * Rik van Riel (riel@...hat.com) wrote:
>> Keep track of which task is running a KVM vcpu.  This helps us
>> figure out later what task to wake up if we want to boost a
>> vcpu that got preempted.
>>
>> Unfortunately there are no guarantees that the same task
>> always keeps the same vcpu, so we can only track the task
>> across a single "run" of the vcpu.
>
> So shouldn't it confine to KVM_RUN?  The other vcpu_load callers aren't
> always a vcpu in a useful runnable state.

Yeah, probably.  If you want I can move the setting of
vcpu->task to kvm_vcpu_ioctl.

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