linux-kernel - Re: [PATCH 00/12] KVM: MMU: cleanup around kvm_sync

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Message-ID: <56CEBB3A.1080709@linux.intel.com>
Date:	Thu, 25 Feb 2016 16:28:42 +0800
From:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
To:	Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc:	yoshikawa_takuya_b1@....ntt.co.jp, mtosatti@...hat.com
Subject: Re: [PATCH 00/12] KVM: MMU: cleanup around kvm_sync_page, and a few
 micro-optimizations



On 02/24/2016 09:17 PM, Paolo Bonzini wrote:
> This series started from looking at mmu_unsync_walk for the ubsan thread.
> Patches 1 and 2 are the result of the discussions in that thread.
>
> Patches 3 to 9 do more cleanups in __kvm_sync_page and its callers.
> Among other changes, it removes kvm_sync_page_transient and avoids
> duplicate code between __kvm_sync_page and kvm_sync_pages.
>
> I stopped where I had questions about the existing kvm_mmu_get_page
> code (see patch 8 for the question).  However perhaps more cleanups
> are possible, also thanks to Takuya's work on that function and
> link_shadow_page.
>
> Patches 10 to 12 are just micro-optimizations.
>
> Guangrong, it would be great if you took a look since you know this part
> of KVM very well.

I have reviewed it and it works fine except the one leaking tlb flush out
of mmu-lock.

I will continue to simplify the path of walking unsync sp to keep
mmu_page_path smaller and make comments for kvm_mmu_get_page on top of
this patchset.

BTW, is any conflict to apply my page-tracking patchset on top of this
patchset (i noticed you've merged this patchset on kvm/queue)? Please
tell me to rebase it if it is needed.