linux-kernel - Re: KVM VM(windows xp) reseted when running geekbench for about 2 days

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Message-ID: <20130418125532.GW8997@redhat.com>
Date:	Thu, 18 Apr 2013 15:55:32 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	"Zhanghaoyu (A)" <haoyu.zhang@...wei.com>
Cc:	kvm list <kvm@...r.kernel.org>, "mst@...hat.com" <mst@...hat.com>,
	qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Luonengjun <luonengjun@...wei.com>,
	Zanghongyong <zanghongyong@...wei.com>,
	"Huangweidong (C)" <weidong.huang@...wei.com>,
	"Wangrui (K)" <moon.wangrui@...wei.com>
Subject: Re: KVM VM(windows xp) reseted when running geekbench for about 2
 days

On Thu, Apr 18, 2013 at 12:00:49PM +0000, Zhanghaoyu (A) wrote:
> I start 10 VMs(windows xp), then running geekbench tool on them, about 2 days, one of them was reset,
> I found the reset operation is done by
> int kvm_cpu_exec(CPUArchState *env)
> {
>     ...
>        switch (run->exit_reason)
>        ...
>         case KVM_EXIT_SHUTDOWN:
>             DPRINTF("shutdown\n");
>             qemu_system_reset_request();
>             ret = EXCP_INTERRUPT;
>             break;
>     ...
> }
> 
> KVM_EXIT_SHUTDOWN exit reason was set previously in triple fault handle handle_triple_fault().
> 
How do you know that reset was done here? This is not the only place
where qemu_system_reset_request() is called.

> What causes the triple fault?
> 
Are you asking what is triple fault or why it happened in your case?
For the former see here: http://en.wikipedia.org/wiki/Triple_fault
For the later it is to late to tell after VM reset. You can run QEMU with
-no-reboot -no-shutdown. VM will pause instead of rebooting and then you
can examine what is going on.

--
			Gleb.
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