From nobody Mon Feb 9 16:47:04 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=gmail.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1625706829919191.53068594501565; Wed, 7 Jul 2021 18:13:49 -0700 (PDT) Received: from localhost ([::1]:36646 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m1Ibs-0006EB-LT for importer@patchew.org; Wed, 07 Jul 2021 21:13:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38204) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKx-0002JD-IO for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:19 -0400 Received: from mga06.intel.com ([134.134.136.31]:36390) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m1IKv-0007ML-OW for qemu-devel@nongnu.org; Wed, 07 Jul 2021 20:56:19 -0400 Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:56 -0700 Received: from ls.sc.intel.com (HELO localhost) ([143.183.96.54]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Jul 2021 17:55:56 -0700 X-IronPort-AV: E=McAfee;i="6200,9189,10038"; a="270534902" X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="270534902" X-IronPort-AV: E=Sophos;i="5.84,222,1620716400"; d="scan'208";a="423770050" From: isaku.yamahata@gmail.com To: qemu-devel@nongnu.org, pbonzini@redhat.com, alistair@alistair23.me, ehabkost@redhat.com, marcel.apfelbaum@gmail.com, mst@redhat.com, cohuck@redhat.com, mtosatti@redhat.com, xiaoyao.li@intel.com, seanjc@google.com, erdemaktas@google.com Subject: [RFC PATCH v2 19/44] hw/i386/e820: introduce a helper function to change type of e820 Date: Wed, 7 Jul 2021 17:54:49 -0700 Message-Id: <57f1c8c44405aadc421bc1fd5b6cb41f55b10e20.1625704981.git.isaku.yamahata@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=134.134.136.31; envelope-from=isaku.yamahata@intel.com; helo=mga06.intel.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_ADSP_CUSTOM_MED=0.001, FORGED_GMAIL_RCVD=1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, NML_ADSP_CUSTOM_MED=0.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1625706831201100001 Content-Type: text/plain; charset="utf-8" From: Isaku Yamahata Introduce a helper function, e820_change_type(), that change the type of subregion of e820 entry. The following patch uses it. Signed-off-by: Isaku Yamahata --- hw/i386/e820_memory_layout.c | 72 ++++++++++++++++++++++++++++++++++++ hw/i386/e820_memory_layout.h | 1 + 2 files changed, 73 insertions(+) diff --git a/hw/i386/e820_memory_layout.c b/hw/i386/e820_memory_layout.c index d9bb11c02a..109c4f715a 100644 --- a/hw/i386/e820_memory_layout.c +++ b/hw/i386/e820_memory_layout.c @@ -57,6 +57,78 @@ int e820_add_entry(uint64_t address, uint64_t length, ui= nt32_t type) return e820_entries; } =20 +int e820_change_type(uint64_t address, uint64_t length, uint32_t type) +{ + size_t i; + + if (type !=3D E820_RAM) { + int ret =3D e820_append_reserve(address, length, type); + if (ret) { + return ret; + } + } + + /* new "etc/e820" file -- include ram too */ + for (i =3D 0; i < e820_entries; i++) { + struct e820_entry *e =3D &e820_table[i]; + struct e820_entry tmp =3D { + .address =3D le64_to_cpu(e->address), + .length =3D le64_to_cpu(e->length), + .type =3D le32_to_cpu(e->type), + }; + /* overlap? */ + if (address + length < tmp.address || + tmp.address + tmp.length < address) { + continue; + } + /* + * partial-overlap is not allowed. + * It is assumed that the region is completely contained within + * other region. + */ + if (address < tmp.address || + tmp.address + tmp.length < address + length) { + return -EINVAL; + } + /* only real type change is allowed. */ + if (tmp.type =3D=3D type) { + return -EINVAL; + } + + if (tmp.address =3D=3D address && + tmp.address + tmp.length =3D=3D address + length) { + e->type =3D cpu_to_le32(type); + return e820_entries; + } else if (tmp.address =3D=3D address) { + e820_table =3D g_renew(struct e820_entry, + e820_table, e820_entries + 1); + e =3D &e820_table[i]; + e->address =3D cpu_to_le64(tmp.address + length); + e820_append_entry(address, length, type); + return e820_entries; + } else if (tmp.address + tmp.length =3D=3D address + length) { + e820_table =3D g_renew(struct e820_entry, + e820_table, e820_entries + 1); + e =3D &e820_table[i]; + e->length =3D cpu_to_le64(tmp.length - length); + e820_append_entry(address, length, type); + return e820_entries; + } else { + e820_table =3D g_renew(struct e820_entry, + e820_table, e820_entries + 2); + e =3D &e820_table[i]; + e->length =3D cpu_to_le64(address - tmp.address); + e820_append_entry(address, length, type); + e820_append_entry(address + length, + tmp.address + tmp.length - (address + length= ), + tmp.type); + return e820_entries; + } + } + + return -EINVAL; +} + int e820_get_num_entries(void) { return e820_entries; diff --git a/hw/i386/e820_memory_layout.h b/hw/i386/e820_memory_layout.h index 2a0ceb8b9c..5f27cee476 100644 --- a/hw/i386/e820_memory_layout.h +++ b/hw/i386/e820_memory_layout.h @@ -33,6 +33,7 @@ extern struct e820_table e820_reserve; extern struct e820_entry *e820_table; =20 int e820_add_entry(uint64_t address, uint64_t length, uint32_t type); +int e820_change_type(uint64_t address, uint64_t length, uint32_t type); int e820_get_num_entries(void); bool e820_get_entry(int index, uint32_t type, uint64_t *address, uint64_t *length); --=20 2.25.1