linux-kernel - Re: [PATCH] KVM: MMU: avoid fast page fault fixing mmio page fault

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Message-ID: <51E77551.7040408@linux.vnet.ibm.com>
Date:	Thu, 18 Jul 2013 12:55:45 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC:	gleb@...hat.com, markus@...ppelsdorf.de, mtosatti@...hat.com,
	pbonzini@...hat.com, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH] KVM: MMU: avoid fast page fault fixing mmio page fault

On 07/18/2013 12:52 PM, Xiao Guangrong wrote:
> Currently, fast page fault tries to fix mmio page fault when the
> generation number is invalid (spte.gen != kvm.gen) and returns to
> guest to retry the fault since it sees the last spte is nonpresent
> which causes infinity loop
> 
> It can be triggered only on AMD host since the mmio page fault is
> recognized as ept-misconfig

Sorry, It should be "recognized as ept-misconfig on Intel host."

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