linux-kernel - Re: [PATCH 00/10 V2] KVM: x86: MMU: Clean up x86's mmu code for future work

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Date:	Thu, 12 Nov 2015 13:08:08 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH 00/10 V2] KVM: x86: MMU: Clean up x86's mmu code for
 future work



On 12/11/2015 12:48, Takuya Yoshikawa wrote:
> v1->v2:
>   Patch 5 and 7 are added based on Paolo's suggestions.
>   Patch 8-10 are new.
> 
> Patch 1/2/3/4: no change.
> Patch 5: Needed a bit more work than I had expected.
> Patch 6: Removed extra comment of v1 (patch 5 made it inappropriate).
> Patch 7: As expected, many places needed to be converted.
> Patch 8: This is new, but only a small change.
> 
> Patch 9: Kind of an RFC (though I have checked it to some extent).
>   Following two places need to be carefully checked:
>   - in kvm_mmu_get_page: "if (!direct)" block after kvm_mmu_alloc_page()
>   - in FNAME(fetch): "if (FNAME(gpte_changed)(vcpu, gw, it.level - 1))" case
> Patch 10: Trivial cleanup, assuming that patch 9 is correct.
> 
> 
> In summary: patch 1-7 is the result of updating v1 based on the suggestions.
>   Although patch 5 does not look so nice than expected, this is the most
>   conservative approach, and patch 8-10 try to alleviate the sadness.

If it works, it's actually better than what we have now.  I'll review it
in a few days.

Marcelo, can you look at this as well?  You are still king of MMU. :)

Thanks,

Paolo
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