Comment 15 for bug 1818937

Same here. Also on macOS host:

$ qemu-system-x86_64 -machine type=q35,accel=hvf \
-cpu max \
-smp 2 \
-hda ubuntu.qcow2 \
-cdrom ./ubuntu-20.04.1-desktop-amd64.iso \
-m 2G \
-vga virtio \
-usb \
-device usb-tablet \
-display default,show-cursor=on
qemu-system-x86_64: Error: HV_ERROR
[1] 77901 abort qemu-system-x86_64 -machine type=q35,accel=hvf -cpu max -smp 2 -hda -cdrom

$ qemu-system-x86_64 --version
QEMU emulator version 5.1.0
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers

$ sysctl -a | grep machdep.cpu.brand_string
machdep.cpu.brand_string: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz