Re: [PATCH 0/6] ONE_REG interface for SBI FWFT extension

[Radim Krčmář]

2025-08-14T21:25:42+05:30, Anup Patel <apatel@xxxxxxxxxxxxxxxx>:
> This series adds ONE_REG interface for SBI FWFT extension implemented
> by KVM RISC-V.

I think it would be better to ONE_REG the CSRs (medeleg/menvcfg), or at
least expose their CSR fields (each sensible medeleg bit, PMM, ...)
through kvm_riscv_config, than to couple this with SBI/FWFT.

The controlled behavior is defined by the ISA, and userspace might want
to configure the S-mode execution environment even when SBI/FWFT is not
present, which is not possible with the current design.

Is there a benefit in expressing the ISA model through SBI/FWFT?

Thanks.