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The 'host' CPU is available in a CONFIG_KVM build and it's currently available for all accels, but is a KVM only CPU. This means that in a RISC-V KVM capable host we can do things like this: $ ./build/qemu-system-riscv64 -M virt,accel=tcg -cpu host --nographic qemu-system-riscv64: H extension requires priv spec 1.12.0 This CPU does not have a priv spec because we don't filter its extensions via priv spec. We shouldn't be reaching riscv_cpu_realize_tcg() at all with the 'host' CPU. We don't have a way to filter the 'host' CPU out of the available CPU options (-cpu help) if the build includes both KVM and TCG. What we can do is to error out during riscv_cpu_realize_tcg() if the user chooses the 'host' CPU with accel=tcg: $ ./build/qemu-system-riscv64 -M virt,accel=tcg -cpu host --nographic qemu-system-riscv64: 'host' CPU is not compatible with TCG acceleration Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-Id: <20230721133411.474105-1-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> |
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