On Fri, Oct 6, 2023 at 11:24 PM Daniel Henrique Barboza
<dbarb...@ventanamicro.com> wrote:
>
> KVM does not have the means to support enabling the rva22u64 profile.
> The main reasons are:
>
> - we're missing support for some mandatory rva22u64 extensions in the
> KVM module;
>
> - we can't make promises about enabling a profile since it all depends
> on host support in the end.
>
> We'll revisit this decision in the future if needed. For now mark the
> 'rva22u64' profile as unavailable when running a KVM CPU:
>
> $ qemu-system-riscv64 -machine virt,accel=kvm -cpu rv64,rva22u64=true
> qemu-system-riscv64: can't apply global rv64-riscv-cpu.rva22u64=true:
> 'rva22u64' is not available with KVM
>
> Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
Alistair
> ---
> target/riscv/kvm/kvm-cpu.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
> index c6615cb807..5f563b83df 100644
> --- a/target/riscv/kvm/kvm-cpu.c
> +++ b/target/riscv/kvm/kvm-cpu.c
> @@ -358,7 +358,7 @@ static void cpu_set_cfg_unavailable(Object *obj, Visitor
> *v,
> }
>
> if (value) {
> - error_setg(errp, "extension %s is not available with KVM",
> + error_setg(errp, "'%s' is not available with KVM",
> propname);
> }
> }
> @@ -438,6 +438,11 @@ static void kvm_riscv_add_cpu_user_properties(Object
> *cpu_obj)
> riscv_cpu_add_kvm_unavail_prop_array(cpu_obj, riscv_cpu_extensions);
> riscv_cpu_add_kvm_unavail_prop_array(cpu_obj, riscv_cpu_vendor_exts);
> riscv_cpu_add_kvm_unavail_prop_array(cpu_obj,
> riscv_cpu_experimental_exts);
> +
> + /* We don't have the needed KVM support for profiles */
> + for (i = 0; riscv_profiles[i] != NULL; i++) {
> + riscv_cpu_add_kvm_unavail_prop(cpu_obj, riscv_profiles[i]->name);
> + }
> }
>
> static int kvm_riscv_get_regs_core(CPUState *cs)
> --
> 2.41.0
>
>
