This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-devel] [PROPOSED REMOVAL] PV guest superpage mappings

To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [PROPOSED REMOVAL] PV guest superpage mappings
From: Keir Fraser <keir.xen@xxxxxxxxx>
Date: Wed, 20 Jul 2011 11:24:41 +0100
Cc: dave.mccracken@xxxxxxxxxx
Delivery-date: Wed, 20 Jul 2011 03:25:31 -0700
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :thread-index:mime-version:content-type:content-transfer-encoding; bh=mR4GopnX901bz0nIJ0aJUElHwhNKgRcLQFaZxedLgKo=; b=QXdDIZICLvl9cGjzyUtBMKRqNnZKUQ/Zi1s2TYbSST5xdeC9SIEHDFAOByZu3+SxrI ad5lByXh43nufsMxzOBRG1heLRV6ijcCLSmz8OIO5mh/iiFoOeH/TK2QYjOMzuAbAsoL Q1EkxBwAV+rmh48abWUFLgBZMPeefZ+akU0fY=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcxGxzw933lzup54z0Ga2Bbgxd/MaA==
Thread-topic: [PROPOSED REMOVAL] PV guest superpage mappings
User-agent: Microsoft-Entourage/
The PV superpage mapping feature has been in the hypervisor for a while now,
but I'm not away of any use of this feature by an upstream guest kernel
(e.g., and primarily of interest, pv_ops Linux). Am I mistaken, or is anyone
looking into or interested in this? If the feature is unused we should
remove it from the hypervisor in this development cycle, as it's untested
and is nothing more than a maintenance burden and security risk. If the
feature is only used by vendor patches, the hypervisor-side implementation
belongs in that vendor's patch queues too.

 -- Keir

Xen-devel mailing list