Configuring qemu for Vector Extension
Mick Thomas Lim
Does a known-good guide exist for building riscv64 qemu to be able to run Vector instructions?
From the main qemu repo, we are to build the riscv64-softmmu target and run the 64-bit Buildroot Image, as described here:
A "Hello World" program compiled with riscv64-unknown-linux-gnu-gcc does work.
But we aren't seeing expected behavior when running the simple rvv_vadd.c program described here:
For example: vl = vsetvl_e32m2 (n) seems to return 0.
This is the qemu run command we're using for buildroot:
qemu-system-riscv64 -cpu rv64,x-v=true,vlen=256,elen=64,vext_spec=v0.7.1 -M virt -nographic -bios output/images/fw_jump.elf -kernel output/images/Image -append "root=/dev/vda ro" -drive file=output/images/rootfs.ext2,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -netdev user,id=net0 -device virtio-net-device,netdev=net0
Assistance would much appreciated!