linux-kernel - Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes) causes hang

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Date:	Wed, 17 Jul 2013 22:28:48 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Xiao Guangrong <xiaoguangrong.eric@...il.com>, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: commit f8f559422b (KVM: MMU: fast invalidate all mmio sptes)
 causes hang

On Wed, Jul 17, 2013 at 09:00:29PM +0200, Markus Trippelsdorf wrote:
> > > 10346403  qemu-system-x86-1403  [001]  1451.422260: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0  
> > > ...
Can you trace only this event and record stack information:
trace-cmd record -T -e kvmmmu:check_mmio_spte


> > > 
> [  236.322519] qemu-system-x86 R  running task        0   603    367 0x00000000
Is this the task that now prints check_mmio_spte ad nauseam?

> [  236.322523]  0000000000000000 0000000100000000 00007fff27e6b950 00000000000fee00
> [  236.322528]  ffff8801df8b3b90 00000000fee000b0 ffff8801dff0b0d1 0000000000000000
> [  236.322533]  ffff8801df8b3b90 ffff8801f7614040 0000000000000000 0000000000000000
> [  236.322537] Call Trace:
> [  236.322544]  [<ffffffff8102aea0>] ? nested_svm_get_tdp_cr3+0x20/0x20
I am assuming you are not running nested guest and this is just a glitch
in the matrix, correct?

> [  236.322551]  [<ffffffff810100b5>] ? kvm_arch_vcpu_ioctl_run+0x415/0x10c0
> [  236.322556]  [<ffffffff810e24cb>] ? page_add_new_anon_rmap+0x2b/0x100
> [  236.322561]  [<ffffffff810d8fbb>] ? handle_pte_fault+0x69b/0x7c0
> [  236.322567]  [<ffffffff8100d10a>] ? kvm_arch_vcpu_load+0x4a/0x1e0
> [  236.322573]  [<ffffffff810022b1>] ? kvm_vcpu_ioctl+0x271/0x500
> [  236.322578]  [<ffffffff811067ec>] ? do_vfs_ioctl+0x2cc/0x4a0
> [  236.322583]  [<ffffffff811069fc>] ? SyS_ioctl+0x3c/0x80
> [  236.322588]  [<ffffffff81583592>] ? system_call_fastpath+0x16/0x1b

--
			Gleb.
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