Re: [PATCH v7 02/16] target/riscv/tcg: do not use "!generic" CPU checks

[Andrew Jones <ajones@ventanamicro.com>]

On Tue, Oct 31, 2023 at 05:39:02PM -0300, Daniel Henrique Barboza wrote:
> Our current logic in get/setters of MISA and multi-letter extensions
> works because we have only 2 CPU types, generic and vendor, and by using
> "!generic" we're implying that we're talking about vendor CPUs. When adding
> a third CPU type this logic will break so let's handle it beforehand.
> 
> In set_misa_ext_cfg() and set_multi_ext_cfg(), check for "vendor" cpu instead
> of "not generic". The "generic CPU" checks remaining are from
> riscv_cpu_add_misa_properties() and cpu_add_multi_ext_prop() before
> applying default values for the extensions.
> 
> This leaves us with:
> 
> - vendor CPUs will not allow extension enablement, all other CPUs will;
> 
> - generic CPUs will inherit default values for extensions, all others
>   won't.
> 
> And now we can add a new, third CPU type, that will allow extensions to
> be enabled and will not inherit defaults, without changing the existing
> logic.
> 
> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
> ---
>  target/riscv/tcg/tcg-cpu.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>