From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Stabellini Subject: [PATCH v4 0/2] make ballooned out pages have a valid mapping at all times Date: Sun, 4 Aug 2013 15:38:48 +0100 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xensource.com Cc: Ian Campbell , Stefano Stabellini , David Vrabel , alex@alex.org.uk, dcrisan@flexiant.com List-Id: xen-devel@lists.xenproject.org Hi all, this patch series limits problems caused by tcp retransmits on NFS when the original block pages were mapped from a foreign domain and now the mapping is gone. It accomplishes the goal by: 1) mapping all ballooned out pages to a per-cpu "balloon_scratch_page"; 2) making sure that once a grant is unmapped, the original mapping to the per-cpu balloon_scratch_page is restored atomically. The first patch accomplishes (1), the second patch uses GNTTABOP_unmap_and_replace to atomically unmap a grant and restore the original mapping. Changes in this version: - add an early_initcall to clear all the possible per_cpu balloon_scratch_page. Stefano Stabellini (2): xen/balloon: set a mapping for ballooned out pages xen/m2p: use GNTTABOP_unmap_and_replace to reinstate the original mapping arch/x86/xen/p2m.c | 22 ++++++++++----- drivers/xen/balloon.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++-- drivers/xen/gntdev.c | 11 +------ include/xen/balloon.h | 3 ++ 4 files changed, 86 insertions(+), 19 deletions(-) git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen.git valid_mapping_4 Cheers, Stefano