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Mon, 16 Mar 2020 12:48:21 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 73F439D13; Mon, 16 Mar 2020 13:48:20 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584362907; 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: in-reply-to:in-reply-to:references:references; bh=TlPyNwnohSBBRgqa9xzMvhZb4FmYT1Lu8PWrE8MRHfs=; b=AIIBTS+zThjmRug4b98dLI4Qo6FI640K1z2oPktv7a75Lq/hLOM+KXBkokBoz/ksvIOy89 l4wyiebBX3H5QhwIp/RyapLaNDldkZp9PRLWyewVpgFU0dutI8CPTju3CecXCCXjo20UlN 7mTkKc/Ndll6WsI5Z2pPtI+JuJ8fTOU= X-MC-Unique: -V6Pol5KN_2LdFuHk7tbog-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 1/1] stdvga+bochs-display: add dummy mmio handler Date: Mon, 16 Mar 2020 13:48:20 +0100 Message-Id: <20200316124820.22063-2-kraxel@redhat.com> In-Reply-To: <20200316124820.22063-1-kraxel@redhat.com> References: <20200316124820.22063-1-kraxel@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 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 Message-id: 20200309100009.17624-1-kraxel@redhat.com --- 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