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Re: [Xen-devel] [PATCH v2 for-4.10] x86/mm: Make PV linear pagetables optional

To: George Dunlap <george.dunlap@xxxxxxxxxx>
From: Wei Liu <wei.liu2@xxxxxxxxxx>
Date: Wed, 18 Oct 2017 12:33:31 +0100
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Wilk <konrad.wilk@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 18 Oct 2017 11:34:09 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Wed, Oct 18, 2017 at 11:51:59AM +0100, George Dunlap wrote:
> Allowing pagetables to point to other pagetables of the same level
> (often called 'linear pagetables') has been included in Xen since its
> inception; but recently it has been the source of a number of subtle
> reference-counting bugs.
> 
> It is not used by Linux or MiniOS; but it used used by NetBSD and

"it used used" here.

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References:
- [Xen-devel] [PATCH v2 for-4.10] x86/mm: Make PV linear pagetables optional
  - From: George Dunlap

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