linux-kernel - Re: [BUG] kvm crashes in 2.6.28-rc6-00007-ged31348

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Message-ID: <49359CDF.5060300@redhat.com>
Date:	Tue, 02 Dec 2008 22:38:55 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Steven Rostedt <srostedt@...hat.com>
CC:	Luis Henriques <henrix@...o.pt>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [BUG] kvm crashes in 2.6.28-rc6-00007-ged31348

Steven Rostedt wrote:
> The following must be available without recursion for the function
> tracer to work:
>
>   local_irq_save/restore
>   smp_processor_id
>   preempt_enable/disable_notrace
>   atomic_inc/dec
>   

In arch/x86/kvm/svm.c, function svm_vcpu_run(), everything between the 
vmrun instruction and the call to load_host_msrs() is executed without a 
live pda, so no smp_processor_id().  Could easily be fixed by 
rearranging things.


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

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