From nobody Thu Nov 13 23:14:38 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=1583748069; cv=none; d=zohomail.com; s=zohoarc; b=HxTKD7AkMsIaveaZELzpBHZNoixhtuSO0al01iFmw5sqYKWjogxj6/WPDuIWpirfK7AWo6v5japUChcqs9IK3V05OooQGVf6z1WzRXEoTiXQq4wS9qxFG/uWpyT6dWlwW+cuanEpX05bBpw7YGE3mVIN1v9BVH0O05DkGAePq7c= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1583748069; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:Sender:Subject:To; bh=ES3lXw1ZEqa4OExeY6H5oIisV44zoMan40FurSUJDUc=; b=QP24xl/JJeugWQMdBKZW13BGzH7dz2TtpkzMgXyVRWLtupx7Xmr2K8KJr103f9gjWtZgeYh07ToAm7B3oePnKDNojP/EtOo5XKDoLmdrnleqKAXdVqgWaF4uRAb0BFG4OIvYmgsNIIJp+xLdKHRr4s1cjUAzZPrP5ym1DeannRo= 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 1583748069956236.47002355185032; Mon, 9 Mar 2020 03:01:09 -0700 (PDT) Received: from localhost ([::1]:39766 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jBFDg-0007PK-Ma for importer@patchew.org; Mon, 09 Mar 2020 06:01:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33798) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jBFCu-0006vB-Kj for qemu-devel@nongnu.org; Mon, 09 Mar 2020 06:00:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jBFCt-0006Ig-FO for qemu-devel@nongnu.org; Mon, 09 Mar 2020 06:00:20 -0400 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:40675 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jBFCt-0006He-Bt for qemu-devel@nongnu.org; Mon, 09 Mar 2020 06:00:19 -0400 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-269-9NyTQlgcPFmTZM4-wC6fvw-1; Mon, 09 Mar 2020 06:00:16 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A954E192296B; Mon, 9 Mar 2020 10:00:15 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-117.ams2.redhat.com [10.36.116.117]) by smtp.corp.redhat.com (Postfix) with ESMTP id 328AA5D9CA; Mon, 9 Mar 2020 10:00:10 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 5AF219D43; Mon, 9 Mar 2020 11:00:09 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583748018; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=ES3lXw1ZEqa4OExeY6H5oIisV44zoMan40FurSUJDUc=; b=OMzq1MGbhs6gRQIEFciaeZN6rcUdbz+HHGzvKcRUvj3jIZ4HCbKDxb6Io5V3FqQZ3sTAGi yCLsEDdq7HywRJqIV3ULqL2rFCbTKXqkwPMfM6ThC+N1ybC7AZJn+C5egvm4t+ceqJuJ0n vEt24bnma6p9wdqUnb6qFxelJBNtk3g= X-MC-Unique: 9NyTQlgcPFmTZM4-wC6fvw-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PATCH v2] stdvga+bochs-display: add dummy mmio handler Date: Mon, 9 Mar 2020 11:00:09 +0100 Message-Id: <20200309100009.17624-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 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: 207.211.31.81 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: Alistair Francis , Gerd Hoffmann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The bochs-display mmio bar has some sub-regions with the actual hardware registers. What happens when the guest access something outside those regions depends on the archirecture. On x86 those reads succeed (and return 0xff I think). On risc-v qemu aborts. This patch adds handlers for the parent region, to make the wanted behavior explicit and to make things consistent across architectures. v2: - use existing unassigned_io_ops. - also cover stdvga. Cc: Alistair Francis Signed-off-by: Gerd Hoffmann --- hw/display/bochs-display.c | 4 ++-- hw/display/vga-pci.c | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/hw/display/bochs-display.c b/hw/display/bochs-display.c index 62085f9fc063..70eb619ef424 100644 --- a/hw/display/bochs-display.c +++ b/hw/display/bochs-display.c @@ -284,8 +284,8 @@ static void bochs_display_realize(PCIDevice *dev, Error= **errp) memory_region_init_io(&s->qext, obj, &bochs_display_qext_ops, s, "qemu extended regs", PCI_VGA_QEXT_SIZE); =20 - memory_region_init(&s->mmio, obj, "bochs-display-mmio", - PCI_VGA_MMIO_SIZE); + memory_region_init_io(&s->mmio, obj, &unassigned_io_ops, NULL, + "bochs-display-mmio", PCI_VGA_MMIO_SIZE); memory_region_add_subregion(&s->mmio, PCI_VGA_BOCHS_OFFSET, &s->vbe); memory_region_add_subregion(&s->mmio, PCI_VGA_QEXT_OFFSET, &s->qext); =20 diff --git a/hw/display/vga-pci.c b/hw/display/vga-pci.c index b34632467399..6b9db86e363c 100644 --- a/hw/display/vga-pci.c +++ b/hw/display/vga-pci.c @@ -249,8 +249,8 @@ static void pci_std_vga_realize(PCIDevice *dev, Error *= *errp) =20 /* mmio bar for vga register access */ if (d->flags & (1 << PCI_VGA_FLAG_ENABLE_MMIO)) { - memory_region_init(&d->mmio, NULL, "vga.mmio", - PCI_VGA_MMIO_SIZE); + memory_region_init_io(&d->mmio, OBJECT(dev), &unassigned_io_ops, N= ULL, + "vga.mmio", PCI_VGA_MMIO_SIZE); =20 if (d->flags & (1 << PCI_VGA_FLAG_ENABLE_QEXT)) { qext =3D true; @@ -285,8 +285,8 @@ static void pci_secondary_vga_realize(PCIDevice *dev, E= rror **errp) s->con =3D graphic_console_init(DEVICE(dev), 0, s->hw_ops, s); =20 /* mmio bar */ - memory_region_init(&d->mmio, OBJECT(dev), "vga.mmio", - PCI_VGA_MMIO_SIZE); + memory_region_init_io(&d->mmio, OBJECT(dev), &unassigned_io_ops, NULL, + "vga.mmio", PCI_VGA_MMIO_SIZE); =20 if (d->flags & (1 << PCI_VGA_FLAG_ENABLE_QEXT)) { qext =3D true; --=20 2.18.2