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

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Date:	Wed, 17 Jul 2013 20:42:26 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Xiao Guangrong <xiaoguangrong.eric@...il.com>
Cc:	Gleb Natapov <gleb@...hat.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 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.

Whole output is over 1.3G of size.

--
Markus
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