linux-kernel - Re: [PATCH 16/22] KVM: MMU: Track page fault data in struct vcpu

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Message-ID: <4BD70A8E.2070906@redhat.com>
Date:	Tue, 27 Apr 2010 19:02:22 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/22] KVM: MMU: Track page fault data in struct vcpu

On 04/27/2010 04:57 PM, Joerg Roedel wrote:
>
>> But the nested guest can use pae paging and generate a #NPF with
>> exit_info_2>  4GB.  So we need to keep the full fault address; if we
>> truncate, the guest might actually resolve the fault and let the
>> nested guest continue.
>>      
> This could only be a malicious guest because it can't have memory above
> 4gb. But a guest could certainly setup its page tables to point there,
> thats true. So I change it to u64.
>    

It doesn't need to be malicious, for example it could set up an mmio PCI 
BAR outside the 4GB space.

-- 
error compiling committee.c: too many arguments to function

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