From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753631Ab1AJKf7 (ORCPT ); Mon, 10 Jan 2011 05:35:59 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:36877 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753587Ab1AJKfy (ORCPT ); Mon, 10 Jan 2011 05:35:54 -0500 X-IronPort-AV: E=Sophos;i="4.60,299,1291611600"; d="scan'208";a="130293798" From: stefano.stabellini@eu.citrix.com To: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xensource.com, Jeremy.Fitzhardinge@citrix.com, konrad.wilk@oracle.com, Stefano Stabellini Subject: [PATCH 09/12] xen p2m: transparently change the p2m mappings in the m2p override Date: Mon, 10 Jan 2011 10:36:38 +0000 Message-Id: <1294655801-16230-9-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: References: X-OriginalArrivalTime: 10 Jan 2011 10:35:53.0799 (UTC) FILETIME=[285C3570:01CBB0B2] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stefano Stabellini In m2p_add_override store the original mfn into page->index and then change the p2m mapping, setting mfns as FOREIGN_FRAME. In m2p_remove_override restore the original mapping. Signed-off-by: Stefano Stabellini --- arch/x86/xen/p2m.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c index 8db19d5..b3b19d4 100644 --- a/arch/x86/xen/p2m.c +++ b/arch/x86/xen/p2m.c @@ -407,8 +407,11 @@ static unsigned long mfn_hash(unsigned long mfn) void m2p_add_override(unsigned long mfn, struct page *page) { unsigned long flags; + unsigned long pfn = page_to_pfn(page); page->private = mfn; + page->index = pfn_to_mfn(pfn); + __set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)); spin_lock_irqsave(&m2p_override_lock, flags); list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]); spin_unlock_irqrestore(&m2p_override_lock, flags); @@ -417,9 +420,18 @@ void m2p_add_override(unsigned long mfn, struct page *page) void m2p_remove_override(struct page *page) { unsigned long flags; + unsigned long mfn; + unsigned long pfn; + + pfn = page_to_pfn(page); + mfn = get_phys_to_machine(pfn); + if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) + return; + spin_lock_irqsave(&m2p_override_lock, flags); list_del(&page->lru); spin_unlock_irqrestore(&m2p_override_lock, flags); + __set_phys_to_machine(pfn, page->index); } struct page *m2p_find_override(unsigned long mfn) -- 1.5.6.5