linux-kernel - Re: [PATCH v2 04/22] KVM: x86: introduce vcpu_gva_to

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Message-ID: <20110629114850.GS491@redhat.com>
Date:	Wed, 29 Jun 2011 14:48:50 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v2 04/22] KVM: x86: introduce vcpu_gva_to_gpa to cleanup
 the code

On Wed, Jun 29, 2011 at 02:26:14PM +0300, Avi Kivity wrote:
> On 06/29/2011 02:26 PM, Xiao Guangrong wrote:
> >On 06/29/2011 07:09 PM, Avi Kivity wrote:
> >>  On 06/29/2011 01:56 PM, Xiao Guangrong wrote:
> >>>  On 06/29/2011 04:24 PM, Avi Kivity wrote:
> >>>
> >>>  >>   +static int vcpu_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
> >>>  >>   +               gpa_t *gpa, struct x86_exception *exception,
> >>>  >>   +               bool write)
> >>>  >>   +{
> >>>  >>   +    u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
> >>>  >>   +
> >>>  >>   +    if (write)
> >>>  >>   +        access |= PFERR_WRITE_MASK;
> >>>  >
> >>>  >   Needs fetch as well so NX/SMEP can work.
> >>>  >
> >>>
> >>>  This function is only used by read/write emulator, execute permission is
> >>>  not needed for read/write, no?
> >>
> >>  It's not good to have a function which only implements the functionality partially.  It can later be misused.
> >>
> >>  You can pass the page-fault-error-code instead of the write parameter, I think it will be simpler.
> >>
> >
> >Actually, we will get the cache mmio info in this function, i think it is pure waste for other
> >access execpt mmio, what about change the function name to vcpu_gva_to_gpa_mmio?
> 
> Not too happy, but ok.
> 
I do plan to add fetching from MMIO.

--
			Gleb.
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