From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753337AbeBSPrp (ORCPT ); Mon, 19 Feb 2018 10:47:45 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:40356 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753336AbeBSPrl (ORCPT ); Mon, 19 Feb 2018 10:47:41 -0500 From: Farhan Ali To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-fbdev@vger.kernel.org Cc: geert@linux-m68k.org, borntraeger@de.ibm.com, tomi.valkeinen@ti.com, thuth@redhat.com, b.zolnierkie@samsung.com, alifm@linux.vnet.ibm.com Subject: [PATCH v3 3/3] s390/setup : enable display support for KVM guest Date: Mon, 19 Feb 2018 10:47:27 -0500 X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: X-TM-AS-GCONF: 00 x-cbid: 18021915-0008-0000-0000-00000958B0AF X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008560; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000254; SDB=6.00992052; UDB=6.00503963; IPR=6.00771398; MB=3.00019637; MTD=3.00000008; XFM=3.00000015; UTC=2018-02-19 15:47:37 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18021915-0009-0000-0000-000046161822 Message-Id: <8a6103fcc2b05f4426dcf6573a2175ffe6211403.1519053920.git.alifm@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2018-02-19_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1802190195 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The S390 architecture does not support any graphics hardware, but with the latest support for Virtio GPU in Linux and Virtio GPU emulation in QEMU, it's possible to enable graphics for S390 using the Virtio GPU device. To enable display we need to enable the Linux Virtual Terminal (VT) layer for S390. But the VT subsystem initializes quite early at boot so we need a dummy console driver till the Virtio GPU driver is initialized and we can run the framebuffer console. The framebuffer console over a Virtio GPU device can be run in combination with the serial SCLP console (default on S390). The SCLP console can still be accessed by management applications (eg: via Libvirt's virsh console). Signed-off-by: Farhan Ali Acked-by: Christian Borntraeger --- arch/s390/kernel/setup.c | 2 ++ drivers/tty/Kconfig | 2 +- drivers/video/console/Kconfig | 2 +- 3 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index a6a91f0..f98a0f3 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -221,6 +221,8 @@ static void __init conmode_default(void) SET_CONSOLE_SCLP; #endif } + if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE)) + conswitchp = &dummy_con; } #ifdef CONFIG_CRASH_DUMP diff --git a/drivers/tty/Kconfig b/drivers/tty/Kconfig index b811442..5ca53fa 100644 --- a/drivers/tty/Kconfig +++ b/drivers/tty/Kconfig @@ -11,7 +11,7 @@ if TTY config VT bool "Virtual terminal" if EXPERT - depends on !S390 && !UML + depends on !UML select INPUT default y ---help--- diff --git a/drivers/video/console/Kconfig b/drivers/video/console/Kconfig index 0023b16..7aa721e 100644 --- a/drivers/video/console/Kconfig +++ b/drivers/video/console/Kconfig @@ -9,7 +9,7 @@ config VGA_CONSOLE depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !FRV && \ !SUPERH && !BLACKFIN && !AVR32 && !MN10300 && !CRIS && \ (!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \ - !ARM64 && !ARC && !MICROBLAZE && !OPENRISC + !ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !S390 default y help Saying Y here will allow you to use Linux in text mode through a -- 2.7.4