Re: [PATCH] target/arm: Limit LPA2 effective output address when TCR.DS == 0

[Richard Henderson <richard.henderson@linaro.org>]

On 11/16/22 09:03, Ard Biesheuvel wrote:
> diff --git a/target/arm/ptw.c b/target/arm/ptw.c
> index 3745ac9723474332..9a6277d862fac229 100644
> --- a/target/arm/ptw.c
> +++ b/target/arm/ptw.c
> @@ -1222,6 +1222,14 @@ static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
>           ps = MIN(ps, param.ps);
>           assert(ps < ARRAY_SIZE(pamax_map));
>           outputsize = pamax_map[ps];
> +
> +        /*
> +         * With LPA2, the effective output address (OA) size is at most 48 bits
> +         * unless TCR.DS == 1
> +         */
> +        if (!param.ds && param.gran != Gran64K) {
> +            outputsize = MIN(outputsize, 48);
> +        }

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

I thought about moving this back into aa64_va_parameters, similar to how we bound tsz, but 
since this is the only use of param.ps, this placement is as good as any.


r~