linux-kernel - Re: [RFC 1/8]KVM: fix bugs in kvm sched integration patch

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Message-ID: <46A58F88.9050906@qumranet.com>
Date:	Tue, 24 Jul 2007 08:35:04 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	kvm-devel <kvm-devel@...ts.sourceforge.net>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC 1/8]KVM: fix bugs in kvm sched integration patch

Shaohua Li wrote:
>>
>>> 1. vmcs_readl/vmcs_writel are called with preempt enabled
>>>  
>>>       
>> Why is that bad?
>>     
> 1. raw_smp_processor_id()
> 2. migrate to other cpu
> 3. current->kvm_vcpu->cpu != the cpu id of step 1.
> you will see the warning.
>   

Ah, that code is gone from preempt-hooks, hence I didn't understand you.

The current version of the patchset does not change
vmcs_readl/vmcs_writel.  So I think everything is safe.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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