Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753667Ab0LONjJ (ORCPT ); Wed, 15 Dec 2010 08:39:09 -0500 Received: from smtp.eu.citrix.com ([62.200.22.115]:19137 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751042Ab0LONjI (ORCPT ); Wed, 15 Dec 2010 08:39:08 -0500 X-IronPort-AV: E=Sophos;i="4.59,348,1288569600"; d="scan'208";a="3360595" Date: Wed, 15 Dec 2010 13:39:27 +0000 From: Stefano Stabellini X-X-Sender: sstabellini@kaball-desktop To: linux-kernel@vger.kernel.org CC: xen-devel@lists.xensource.com, Jeremy Fitzhardinge , Stefano Stabellini Subject: [PATCH 00/11] xen: allow usermode to map granted pages Message-ID: User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2334 Lines: 61 Hi all, this patch series introduces the gntdev device that allows usermode to map granted pages; gntdev is used by qemu to implement Xen backends in userspace. Considering that granted pages still have the same entry in the m2p as before being granted, the following patches also add a mechanism to override portions of the m2p so that we can find out the pfn corresponding to the mfn of a granted page in the "receiver" domain. This is needed so that we can have pte_page work correctly for these pages. Once this requirement is satisfied, __get_user_pages_fast can work on granted pages and userspace applications (the xen block backend implemented in qemu) can use AIO on them. The list of patches and the diffstat follow: Gerd Hoffmann (1): xen/gntdev: allow usermode to map granted pages Ian Campbell (2): xen: define gnttab_set_map_op/unmap_op xen: gntdev: move use of GNTMAP_contains_pte next to the map_op Jeremy Fitzhardinge (5): xen/gntdev: add VM_PFNMAP to vma xen: move p2m handling to separate file xen: add m2p override mechanism xen/gntdev: stop using "token" argument xen p2m: clear the old pte when adding a page to m2p_override Stefano Stabellini (3): xen p2m: transparently change the p2m mappings in the m2p override xen: introduce gnttab_map_refs and gnttab_unmap_refs xen gntdev: use gnttab_map_refs and gnttab_unmap_refs arch/x86/include/asm/xen/page.h | 16 +- arch/x86/xen/Makefile | 3 +- arch/x86/xen/mmu.c | 365 --------------------- arch/x86/xen/p2m.c | 493 ++++++++++++++++++++++++++++ drivers/xen/Kconfig | 7 + drivers/xen/Makefile | 2 + drivers/xen/gntdev.c | 672 +++++++++++++++++++++++++++++++++++++++ drivers/xen/grant-table.c | 36 ++ include/xen/gntdev.h | 119 +++++++ include/xen/grant_table.h | 44 +++- 10 files changed, 1387 insertions(+), 370 deletions(-) Cheers, Stefano P.S. I'll be AFK for a couple of weeks, so don't expect an immediate reply. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/