linux-kernel - Re: [PATCH 4/10] KVM MMU: Move invlpg code out of paging

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Date:	Fri, 23 Apr 2010 14:43:07 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/10] KVM MMU: Move invlpg code out of paging_tmpl.h

On 04/23/2010 02:27 PM, Avi Kivity wrote:
> On 04/22/2010 09:12 AM, Xiao Guangrong wrote:
>> Using '!sp->role.cr4_pae' replaces 'PTTYPE == 32' and using
>> 'pte_size = sp->role.cr4_pae ? 8 : 4' replaces sizeof(pt_element_t)
>>
>> Then no need compile twice for this code
>>
> I think we should keep it in - kvm_mmu_pte_write() calls back to 
> FNAME(update_pte), we could make the call directly from here speed 
> things up, since we already have the spte and don't need to look it up.
>

I see you do this in patches 9, 10 - but is it possible to use 
update_pte directly?  I think we'll need to make 
guess_page_from_pte_write() part of paging_tmpl.h (in general anything 
that depends on pte size is better off in paging_tmpl.h).

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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