Re: [PATCH] target/riscv: pmp: Fixup TLB size calculation

[Richard Henderson]

On 10/12/22 18:14, Alistair Francis wrote:
> From: Alistair Francis<alistair.francis@wdc.com>
>
> Since commit 4047368938f6 "accel/tcg: Introduce tlb_set_page_full" we
> have been seeing this assert
>
>      ../accel/tcg/cputlb.c:1294: tlb_set_page_with_attrs: Assertion 
> `is_power_of_2(size)' failed.
>
> When running Tock on the OpenTitan machine.
>
> The issue is that pmp_get_tlb_size() would return a TLB size that wasn't
> a power of 2. The size was also smaller then TARGET_PAGE_SIZE.
>
> This patch ensures that any TLB size less then TARGET_PAGE_SIZE is
> rounded down to 1 to ensure it's a valid size.
>
> Signed-off-by: Alistair Francis<alistair.francis@wdc.com>
> ---
> This is based on advice from Richard:
> https://patchwork.kernel.org/project/qemu-devel/patch/20221004141051.110653-9-richard.henderson@linaro.org/#25043166
>
>   target/riscv/pmp.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


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