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s390/setup: enable display support for KVM guest
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>
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parent
daea5469e1
commit
2584003042
3 changed files with 4 additions and 2 deletions
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@ -221,6 +221,8 @@ static void __init conmode_default(void)
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SET_CONSOLE_SCLP;
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#endif
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}
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if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
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conswitchp = &dummy_con;
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}
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#ifdef CONFIG_CRASH_DUMP
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@ -11,7 +11,7 @@ if TTY
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config VT
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bool "Virtual terminal" if EXPERT
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depends on !S390 && !UML
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depends on !UML
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select INPUT
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default y
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---help---
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@ -9,7 +9,7 @@ config VGA_CONSOLE
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depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !FRV && \
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!SUPERH && !BLACKFIN && !AVR32 && !MN10300 && !CRIS && \
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(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
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!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && HAS_IOMEM
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!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && HAS_IOMEM && !S390
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default y
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help
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Saying Y here will allow you to use Linux in text mode through a
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