I want to allocate some video memory to a Qemu VM which uses
virgl VGA to enable 3D acceleration. I typed this command to try to allocate 1G video memory to it:
qemu-system-x86_64 -hda RedHat.qcow2 -m 2G -smp 8 \ -device virtio-vga-gl,max_hostmem=1000 -display gtk,gl=on
But it doesn't work; the
virgl device in VM does not obtain the allocated video memory. This can be shown by
info ramblock command in Qemu monitor:
(qemu) info ramblock Block Name PSize Offset Used Total 0000:00:03.0/vga.vram 4 KiB 0x00000000800c0000 0x0000000000800000 0x0000000000800000 0000:00:03.0/virtio-vga.rom 4 KiB 0x00000000808c0000 0x0000000000010000 0x0000000000010000
So, how can I allocate video memory to
virtio-vga-gl device? The host is Ubuntu 20.10, the guest is RHEL 8.5, and Qemu is built from latest source 6.2.0-rc4.
As a side question, where can I find full documents of latest Qemu options and its properties like
show-cursor=on? I know
-device help command line option of Qemu, but it contains no further document. I googled a lot but can only find docs like this which almost says nothing. This document is too old. I also read this question. It's only 3 years old, but already out-of-date. I'll appreciate it if you can let me know the url in comment.