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s390/setup: enable display support for KVM guest

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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 <alifm@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <e23b61f4f599ba23881727a1e8880e9d60cc6a48.1519315352.git.alifm@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Farhan Ali 2018-02-22 11:22:24 -05:00 committed by Christian Borntraeger
parent daea5469e1
commit 2584003042
3 changed files with 4 additions and 2 deletions
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2
arch/s390/kernel/setup.c
View file

@ -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

2
drivers/tty/Kconfig
View file

@ -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---

2
drivers/video/console/Kconfig
View file

@ -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 && HAS_IOMEM
!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && HAS_IOMEM && !S390
default y
help
Saying Y here will allow you to use Linux in text mode through a