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

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Date:	Wed, 17 Jul 2013 21:38:26 +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 03:27 +0800, Xiao Guangrong wrote:
> 
> 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;
>  }

This fixes the issue for me. Many thanks Xiao.

-- 
Markus
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