Re: [PATCH] lib: sbi_domain_context: Flush TLB after SATP mode switch

On Wed, Apr 29, 2026 at 11:48 PM Zishun Yi <[email protected]> wrote:
>
> When switching between domains with different satp.MODE values (e.g.
> Sv39 to Sv48), the RISC-V ISA permits hardware to use cached
> translations from the old virtual-address width if no SFENCE.VMA
> intervenes.  This constrained-unpredictable behavior is clarified in
> riscv-isa-manual PR #2219.
>
> Add __sbi_sfence_vma_all() after the csr_swap(CSR_SATP, ...) in
> switch_to_next_domain_context() to ensure translations from the new
> domain's address width are used.
>
> Link: https://github.com/riscv/riscv-isa-manual/pull/2219

The hart protection re-configuration will anyway perform full sfence / hfence
so instead of adding yet another sfence over here it will be better to move
the hart protection re-configuration after the CSR+FP+Vector context
switch.

I will update the commit description and do the required code movement
at the time of merging this patch.

Reviewed-by: Anup Patel <[email protected]>

Applied this patch to the riscv/opensbi repo.

Thanks,
Anup

-- 
opensbi mailing list
[email protected]
http://lists.infradead.org/mailman/listinfo/opensbi