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

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Date:	Wed, 17 Jul 2013 21:55:39 +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 08:42:26PM +0200, Markus Trippelsdorf wrote:
> On 2013.07.18 at 01:25 +0800, Xiao Guangrong wrote:
> > Hi Markus,
> > 
> > Thanks for your report! I am downloading the ubuntu iso and will try to reproducible it.
> > 
> > Could you please enable these tracepoints:
> > kvmmmu/check_mmio_spte
> > kvmmmu/handle_mmio_page_fault
> > kvmmmu/kvm_mmu_invalidate_zap_all_pages
> > kvmmmu/mark_mmio_spte
> > kvm/kvm_mmio
> > kvm/vcpu_match_mmio
> > 
> > and post the output?
> > 
> First line repeated ad nauseam.
> ...
> 10346367  qemu-system-x86-1403  [001]  1451.422225: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346368  qemu-system-x86-1403  [001]  1451.422226: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346369  qemu-system-x86-1403  [001]  1451.422227: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346370  qemu-system-x86-1403  [001]  1451.422228: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346371  qemu-system-x86-1403  [001]  1451.422229: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346372  qemu-system-x86-1404  [002]  1451.422229: kvm_mmio:             mmio write len 4 gpa 0xfee000b0 val 0x0
> 10346373  qemu-system-x86-1403  [001]  1451.422230: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346374  qemu-system-x86-1403  [001]  1451.422231: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346375  qemu-system-x86-1403  [001]  1451.422232: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346376  qemu-system-x86-1403  [001]  1451.422233: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346377  qemu-system-x86-1403  [001]  1451.422234: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346378  qemu-system-x86-1403  [001]  1451.422235: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346379  qemu-system-x86-1404  [002]  1451.422236: kvm_mmio:             mmio write len 4 gpa 0xfee00380 val 0x3c7b0
> 10346380  qemu-system-x86-1403  [001]  1451.422237: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346381  qemu-system-x86-1403  [001]  1451.422238: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346382  qemu-system-x86-1403  [001]  1451.422239: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346383  qemu-system-x86-1403  [001]  1451.422240: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346384  qemu-system-x86-1403  [001]  1451.422241: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346385  qemu-system-x86-1403  [001]  1451.422242: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346386  qemu-system-x86-1403  [001]  1451.422243: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346387  qemu-system-x86-1403  [001]  1451.422244: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0
> 10346403  qemu-system-x86-1403  [001]  1451.422260: check_mmio_spte:      spte ffff0000fee00e3f kvm_gen 7ffc8 spte-gen 7ffc7 valid 0  
> ...
> Last line repeated ad nauseam.
> 
While this happens can you run "echo t > /proc/sysrq-trigger" and attach
dmesg here.

--
			Gleb.
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