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

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Date:	Thu, 18 Jul 2013 03:22:32 +0800
From:	Xiao Guangrong <xiaoguangrong.eric@...il.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
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

Hi,

Could you please try this:

index 460b9c6..16d1578 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2952,6 +2952,9 @@ static bool page_fault_can_be_fast(u32 error_code)
              !(error_code & PFERR_WRITE_MASK))
                return false;
 
+       if (error_code & PFERR_RSVD_MASK)
+               return false;
+
        return true;
 }


On Jul 18, 2013, at 2:42 AM, Markus Trippelsdorf <markus@...ppelsdorf.de> 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 0index 460b9c6..16d1578 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -2952,6 +2952,9 @@ static bool page_fault_can_be_fast(u32 error_code)
>               !(error_code & PFERR_WRITE_MASK))
>                 return false;
>  
> +       if (error_code & PFERR_RSVD_MASK)
> +               return false;
> +
>         return true;
>  }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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