Comment 3 for bug 1940453

According to the QEMU documenation:

"For QEMU’s RISC-V system emulation, you must specify which board model you want to use with the -M or --machine option; there is no default."

The option accel=accels1[:accels2[:...]] identifies multiple accelerator. The first working one is chosen. So it is ok to use

    -M virt accel=kvm:tcg

for RISC-V. As KVM is not available currently QEMU will fallback to TCG.