From nobody Thu Nov 13 20:40:37 2025 Delivered-To: importer@patchew.org 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; Authentication-Results: mx.zohomail.com; dkim=fail; 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=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1582580141; cv=none; d=zohomail.com; s=zohoarc; b=AaYuhnC+rCYbqtpklbDSpUk+O8iNOnmSNq0f0zSIYh+9om5/KMAgh2r3z3DWK5kkoUo2v8eNOujFtGsp7yWRh+/ilVdAKyvg/u2N+3HNB8r9KbJTX5wk4Vk2zRnUgUcu97mpTm1UNXLfilo2kseqmgqMlXW8Wg7/t/IVqepeqBs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1582580141; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=GBNzuBX+l+LuROYmtlMct7VCTnb/r/o0TNqAlSU1sE8=; b=mFdYDxLkXwHIqRP2tsK2O+SlqiW4iXKPkgGWyboFfqcS8vQUA0v4lEburKce2AHxA8Mpl+nO9tSPCgawcnSfEngEG3nDhkdKeaoAMuM5a8G6l8lta83dNZjFU/K3dpIC3A1cqFQ4oD4NkT/hwN3cjEDiQeaNeSwI9Wo/uh/ZxyQ= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; 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 header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1582580141813232.61242259648554; Mon, 24 Feb 2020 13:35:41 -0800 (PST) Received: from localhost ([::1]:44166 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j6LO8-0007MJ-HF for importer@patchew.org; Mon, 24 Feb 2020 16:35:40 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52659) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j6Kpx-00051u-Em for qemu-devel@nongnu.org; Mon, 24 Feb 2020 16:00:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j6Kpw-0006an-0D for qemu-devel@nongnu.org; Mon, 24 Feb 2020 16:00:21 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:20259 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j6Kpv-0006aP-RD for qemu-devel@nongnu.org; Mon, 24 Feb 2020 16:00:19 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-13-5sQM0hkiO1O7hIVqfdrbZQ-1; Mon, 24 Feb 2020 16:00:15 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 298FC8018A4; Mon, 24 Feb 2020 21:00:11 +0000 (UTC) Received: from x1w.redhat.com (ovpn-205-162.brq.redhat.com [10.40.205.162]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 2D05B5C54A; Mon, 24 Feb 2020 20:59:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582578019; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GBNzuBX+l+LuROYmtlMct7VCTnb/r/o0TNqAlSU1sE8=; b=NYWYdq638vLw1UySYVSXgYs5hb2ilS5AYmowNfJfhxQAqGMwkrL8vKIJSX/kzje8C027Ui 3SP3ZXd79/jiJE1L9WkAuE9y5cjKvcDzrCT+wxQwxFKHq7NbdhxfezrnNn4ZR7ZUiSQiKC 3om/MKDQ17Zh7MLPNiQ7byxDxtvwTEE= X-MC-Unique: 5sQM0hkiO1O7hIVqfdrbZQ-1 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org, Paolo Bonzini , Peter Maydell Subject: [PATCH RESEND v2 18/32] hw/i386/pc_sysfw: Simplify using memory_region_init_alias() Date: Mon, 24 Feb 2020 21:55:19 +0100 Message-Id: <20200224205533.23798-19-philmd@redhat.com> In-Reply-To: <20200224205533.23798-1-philmd@redhat.com> References: <20200224205533.23798-1-philmd@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: Sagar Karandikar , "Michael S. Tsirkin" , Jason Wang , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Mark Cave-Ayland , KONRAD Frederic , Alistair Francis , "Edgar E. Iglesias" , Subbaraya Sundeep , qemu-block@nongnu.org, Magnus Damm , =?UTF-8?q?Herv=C3=A9=20Poussineau?= , Joel Stanley , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Aleksandar Rikalo , David Gibson , Artyom Tarasenko , Eduardo Habkost , Jean-Christophe Dubois , Alistair Francis , Fabien Chouteau , qemu-arm@nongnu.org, Peter Chubb , Palmer Dabbelt , Richard Henderson , Kevin Wolf , qemu-riscv@nongnu.org, Igor Mitsyanko , Bastian Koppelmann , Laurent Vivier , Max Reitz , Michael Walle , qemu-ppc@nongnu.org, Aleksandar Markovic , Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" The scripts/coccinelle/memory-region-housekeeping.cocci reported: * TODO [[view:hw/i386/pc_sysfw.c::face=3Dovl-face1::linb=3D67::colb=3D4::co= le=3D26][potential use of memory_region_init_rom*() in hw/i386/pc_sysfw.c:= :67]] pc_isa_bios_init() does a manual copy of a part of the BIOS, from a read-only region. We can simplify by directly aliasing the same part. Before: (qemu) info mtree memory-region: system 0000000000000000-ffffffffffffffff (prio 0, i/o): system 0000000000000000-0000000007ffffff (prio 0, ram): alias ram-below-4g @= pc.ram 0000000000000000-0000000007ffffff 0000000000000000-ffffffffffffffff (prio -1, i/o): pci 00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem 00000000000c0000-00000000000dffff (prio 1, rom): pc.rom 00000000000e0000-00000000000fffff (prio 1, rom): isa-bios ... 00000000fff00000-00000000ffffffff (prio 0, romd): system.flash0 After: (qemu) info mtree memory-region: system 0000000000000000-ffffffffffffffff (prio 0, i/o): system 0000000000000000-0000000007ffffff (prio 0, ram): alias ram-below-4g @= pc.ram 0000000000000000-0000000007ffffff 0000000000000000-ffffffffffffffff (prio -1, i/o): pci 00000000000a0000-00000000000bffff (prio 1, i/o): vga-lowmem 00000000000c0000-00000000000dffff (prio 1, rom): pc.rom 00000000000e0000-00000000000fffff (prio 1, romd): alias isa-bios @s= ystem.flash0 00000000000e0000-00000000000fffff ... 00000000fff00000-00000000ffffffff (prio 0, romd): system.flash0 Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- hw/i386/pc_sysfw.c | 24 ++++++------------------ 1 file changed, 6 insertions(+), 18 deletions(-) diff --git a/hw/i386/pc_sysfw.c b/hw/i386/pc_sysfw.c index f5f3f466b0..e864c09ea8 100644 --- a/hw/i386/pc_sysfw.c +++ b/hw/i386/pc_sysfw.c @@ -54,31 +54,19 @@ static void pc_isa_bios_init(MemoryRegion *rom_memory, MemoryRegion *flash_mem, int ram_size) { - int isa_bios_size; - MemoryRegion *isa_bios; - uint64_t flash_size; - void *flash_ptr, *isa_bios_ptr; - - flash_size =3D memory_region_size(flash_mem); + uint64_t isa_bios_size; + MemoryRegion *isa_bios =3D g_new(MemoryRegion, 1); + uint64_t flash_size =3D memory_region_size(flash_mem); =20 /* map the last 128KB of the BIOS in ISA space */ isa_bios_size =3D MIN(flash_size, 128 * KiB); - isa_bios =3D g_malloc(sizeof(*isa_bios)); - memory_region_init_ram(isa_bios, NULL, "isa-bios", isa_bios_size, - &error_fatal); + memory_region_init_alias(isa_bios, NULL, "isa-bios", flash_mem, + flash_size - isa_bios_size, + isa_bios_size); memory_region_add_subregion_overlap(rom_memory, 0x100000 - isa_bios_size, isa_bios, 1); - - /* copy ISA rom image from top of flash memory */ - flash_ptr =3D memory_region_get_ram_ptr(flash_mem); - isa_bios_ptr =3D memory_region_get_ram_ptr(isa_bios); - memcpy(isa_bios_ptr, - ((uint8_t*)flash_ptr) + (flash_size - isa_bios_size), - isa_bios_size); - - memory_region_set_readonly(isa_bios, true); } =20 static PFlashCFI01 *pc_pflash_create(PCMachineState *pcms, --=20 2.21.1