linux-kernel - Re: [PATCH 12/15] KVM: MTRR: introduce mtrr_for_each_mem

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Message-ID: <556C6B87.6080403@redhat.com>
Date:	Mon, 01 Jun 2015 16:26:15 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
CC:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/15] KVM: MTRR: introduce mtrr_for_each_mem_type



On 01/06/2015 11:33, Paolo Bonzini wrote:
>> +	looker->mem_type = looker->mtrr_state->fixed_ranges[index];
>> > +	looker->start = fixed_mtrr_range_end_addr(seg, index);
>> > +	return true;
> in mtrr_lookup_fixed_start is the same as this:
> 
>> > 
>> > +	end = fixed_mtrr_range_end_addr(looker->seg, looker->index);
>> > +
>> > +	/* switch to next segment. */
>> > +	if (end >= eseg->end) {
>> > +		looker->seg++;
>> > +		looker->index = 0;
>> > +
>> > +		/* have looked up for all fixed MTRRs. */
>> > +		if (looker->seg >= ARRAY_SIZE(fixed_seg_table))
>> > +			return mtrr_lookup_var_start(looker);
>> > +
>> > +		end = fixed_mtrr_range_end_addr(looker->seg, looker->index);
>> > +	}
>> > +
>> > +	looker->mem_type = mtrr_state->fixed_ranges[looker->index];
>> > +	looker->start = end;
> in mtrr_lookup_fixed_next.  Can you try to make them more common?
> 
> Basically you should have
> 
> +#define mtrr_for_each_mem_type(_looker_, _mtrr_, _gpa_start_, _gpa_end_) \
> +	for (mtrr_lookup_init(_looker_, _mtrr_, _gpa_start_, _gpa_end_); \
> +	     !mtrr_lookup_end(_looker_); mtrr_lookup_next(_looker_))

... where the above code I quoted would be part of mtrr_lookup_end.

Paolo
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