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docs: document the riscv64 RVA23 profile CPU requirement
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vhaudiquet
2026-09-21 01:24:11 +02:00
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README.md
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@@ -143,6 +143,7 @@ Host bind mounts (`--bind`, `--bind-rw`) are not applied in this mode.
Requirements: Requirements:
- `qemu-system-<arch>` installed - `qemu-system-<arch>` installed
- For custom kernels: kernel must have serial console support - For custom kernels: kernel must have serial console support
- riscv64 VMs need QEMU ≥ 10.1 (`rva23s64` CPU, required by Ubuntu 25.10+ RVA23 userland)
## Supported distributions ## Supported distributions
SPEC.md
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@@ -282,6 +282,7 @@ ecr --kernel=/boot/vmlinuz debian -- /bin/sh -c "echo hello"
- `-display none -serial mon:stdio` - console on stdio - `-display none -serial mon:stdio` - console on stdio
- `-netdev user,id=net0 -device virtio-net-pci,netdev=net0` - network NIC - `-netdev user,id=net0 -device virtio-net-pci,netdev=net0` - network NIC
- `-enable-kvm -cpu host` - when the host supports KVM and the target matches the host architecture - `-enable-kvm -cpu host` - when the host supports KVM and the target matches the host architecture
- `-cpu rva23s64` - riscv64 under TCG otherwise. Ubuntu builds its riscv64 port against the RVA23 profile (since 25.10); QEMU's default `rv64` CPU does not implement all profile extensions, so Ubuntu binaries die with SIGILL during init. Profiles are supersets, so baseline rv64gc rootfses (Alpine, older Ubuntu) run unchanged. Needs QEMU ≥ 10.1 (named profile CPUs).
5. Wait for QEMU to exit (init powers the VM off when the command/shell exits; `-no-reboot` makes QEMU terminate) 5. Wait for QEMU to exit (init powers the VM off when the command/shell exits; `-no-reboot` makes QEMU terminate)
6. Cleanup temporary files 6. Cleanup temporary files