From patchwork Sun Dec 4 18:09:38 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Avi Kivity X-Patchwork-Id: 129187 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id CE71A1007D5 for ; Mon, 5 Dec 2011 05:30:19 +1100 (EST) Received: from localhost ([::1]:35330 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RXGWg-0004IH-5J for incoming@patchwork.ozlabs.org; Sun, 04 Dec 2011 13:10:58 -0500 Received: from eggs.gnu.org ([140.186.70.92]:58258) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RXGVi-0001Yg-2o for qemu-devel@nongnu.org; Sun, 04 Dec 2011 13:09:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RXGVf-0004Gz-E3 for qemu-devel@nongnu.org; Sun, 04 Dec 2011 13:09:58 -0500 Received: from mx1.redhat.com ([209.132.183.28]:62677) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RXGVf-0004Gh-7W for qemu-devel@nongnu.org; Sun, 04 Dec 2011 13:09:55 -0500 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id pB4I9sdY001601 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Sun, 4 Dec 2011 13:09:54 -0500 Received: from cleopatra.tlv.redhat.com (cleopatra.tlv.redhat.com [10.35.255.11]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id pB4I9rBN021318 for ; Sun, 4 Dec 2011 13:09:54 -0500 Received: from s01.tlv.redhat.com (s01.tlv.redhat.com [10.35.255.8]) by cleopatra.tlv.redhat.com (Postfix) with ESMTP id BFC5F250BA0; Sun, 4 Dec 2011 20:09:48 +0200 (IST) From: Avi Kivity To: qemu-devel@nongnu.org Date: Sun, 4 Dec 2011 20:09:38 +0200 Message-Id: <1323022181-28110-4-git-send-email-avi@redhat.com> In-Reply-To: <1323022181-28110-1-git-send-email-avi@redhat.com> References: <1323022181-28110-1-git-send-email-avi@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 3/6] memory: introduce memory_region_set_alias_offset() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add an API to update an alias offset of an active alias. This can be used to simplify implementation of dynamic memory banks. Signed-off-by: Avi Kivity --- memory.c | 14 ++++++++++++++ memory.h | 13 ++++++++++++- 2 files changed, 26 insertions(+), 1 deletions(-) diff --git a/memory.c b/memory.c index a080d21..7e842b3 100644 --- a/memory.c +++ b/memory.c @@ -1345,6 +1345,20 @@ void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr) memory_region_transaction_commit(); } +void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset) +{ + target_phys_addr_t old_offset = mr->alias_offset; + + assert(mr->alias); + mr->alias_offset = offset; + + if (offset == old_offset || !mr->parent) { + return; + } + + memory_region_update_topology(mr); +} + void set_system_memory_map(MemoryRegion *mr) { address_space_memory.root = mr; diff --git a/memory.h b/memory.h index db53422..2022de7 100644 --- a/memory.h +++ b/memory.h @@ -527,7 +527,18 @@ void memory_region_set_enabled(MemoryRegion *mr, bool enabled); * @mr: the region to be updated * @addr: new address, relative to parent region */ -void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr); +void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t offset); + +/* + * memory_region_set_alias_offset: dynamically update a memory alias's offset + * + * Dynamically updates the offset into the target region that an alias points + * to, as if the fourth argument to memory_region_init_alias() has changed. + * + * @mr: the #MemoryRegion to be updated; should be an alias. + * @offset: the new offset into the target memory region + */ +void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t addr); /* Start a transaction; changes will be accumulated and made visible only * when the transaction ends.