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Most of QEMU's PCI display device models, such as: libvirt video/model/@type QEMU -device ------------------------- ------------ cirrus cirrus-vga vga VGA qxl qxl-vga virtio virtio-vga come with a linear framebuffer (sometimes called "VGA compatibility framebuffer"). This linear framebuffer lives in one of the PCI device's MMIO BARs, and allows guest code (primarily: firmware drivers, and non-accelerated OS drivers) to display graphics with direct memory access. Due to architectural reasons on aarch64/KVM hosts, this kind of framebuffer doesn't / can't work in qemu-system-(arm|aarch64) -M virt machines. Cache coherency issues guarantee a corrupted / unusable display. The problem has been researched by several people, including kvm-arm maintainers, and it's been decided that the best way (practically the only way) to have boot time graphics for such guests is to consolidate on QEMU's "virtio-gpu-pci" device. >From <https://bugzilla.redhat.com/show_bug.cgi?id=1195176>, libvirt supports <devices> <video> <model type='virtio'/> </video> </devices> but libvirt unconditionally maps @type='virtio' to QEMU's "virtio-vga" device model. (See the qemuBuildDeviceVideoStr() function and the "qemuDeviceVideo" enum impl.) According to the above, this is not right for the "virt" machine type; the qemu-system-(arm|aarch64) binaries don't even recognize the "virtio-vga" device model (justifiedly). Whereas "virtio-gpu-pci", which is a pure virtio device without a compatibility framebuffer, is available, and works fine. (The ArmVirtQemu ("AAVMF") platform of edk2 -- that is, the UEFI firmware for "virt" -- supports "virtio-gpu-pci", as of upstream commit 3ef3209d3028. See <https://tianocore.acgmultimedia.com/show_bug.cgi?id=66>.) Override the default mapping of "virtio", from "virtio-vga" to "virtio-gpu-pci", if qemuDomainMachineIsVirt() evaluates to true. Cc: Andrea Bolognani <abologna@redhat.com> Cc: Drew Jones <drjones@redhat.com> Cc: Marc-André Lureau <marcandre.lureau@redhat.com> Cc: Martin Kletzander <mkletzan@redhat.com> Suggested-by: Marc-André Lureau <marcandre.lureau@redhat.com> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1372901 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Acked-by: Martin Kletzander <mkletzan@redhat.com>
27 lines
753 B
Plaintext
27 lines
753 B
Plaintext
LC_ALL=C \
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PATH=/bin \
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HOME=/home/test \
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USER=test \
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LOGNAME=test \
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QEMU_AUDIO_DRV=none \
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/opt/qemu-installed/bin/qemu-system-aarch64 \
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-name aarch64-vgpu \
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-S \
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-M virt \
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-cpu cortex-a57 \
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-m 1024 \
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-smp 1,sockets=1,cores=1,threads=1 \
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-uuid f3197c89-6457-44fe-b26d-897090ba6541 \
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-nographic \
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-nodefconfig \
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-nodefaults \
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-monitor unix:/tmp/lib/domain--1-aarch64-vgpu/monitor.sock,server,nowait \
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-device ioh3420,port=0x8,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,\
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addr=0x1 \
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-device ioh3420,port=0x9,chassis=2,id=pci.2,bus=pcie.0,multifunction=on,\
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addr=0x1.0x1 \
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-device virtio-net-pci,vlan=0,id=net0,mac=52:54:00:73:34:53,bus=pci.1,addr=0x0,\
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bootindex=1 \
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-net user,vlan=0,name=hostnet0 \
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-device virtio-gpu-pci,id=video0,bus=pci.2,addr=0x0
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