linux-kernel - Re: [PATCH v2 03/22] KVM: x86: fix broken read emulation spans a page boundary

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Message-ID: <4E0B0A40.3020302@redhat.com>
Date:	Wed, 29 Jun 2011 14:19:28 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 03/22] KVM: x86: fix broken read emulation spans a
 page boundary

On 06/29/2011 01:53 PM, Xiao Guangrong wrote:
> On 06/29/2011 04:21 PM, Avi Kivity wrote:
>
> >>
> >>  -    if (kvm_read_guest_virt(ctxt, addr, val, bytes, exception)
> >>  -        == X86EMUL_CONTINUE)
> >>  +    if (!kvm_read_guest(vcpu->kvm, gpa, val, bytes))
> >>            return X86EMUL_CONTINUE;
> >
> >  This doesn't perform the cpl check.
> >
>
> Firstly, it calls kvm_mmu_gva_to_gpa_read to translate gva to gpa, and cpl
> is checked in this function, it is not enough?

You are right, it is enough.  I don't know how I missed it.

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

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