Re: [PATCH v4 01/19] hw/arm/smmu-common: Add missing size check for stage-1

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

On Mon, Jul 01, 2024 at 11:02:23AM +0000, Mostafa Saleh wrote:
> According to the SMMU architecture specification (ARM IHI 0070 F.b),
> in “3.4 Address sizes”
>     The address output from the translation causes a stage 1 Address Size
>     fault if it exceeds the range of the effective IPA size for the given CD.
> 
> However, this check was missing.
> 
> There is already a similar check for stage-2 against effective PA.
> 
> Reviewed-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Mostafa Saleh <smostafa@google.com>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

> ---
>  hw/arm/smmu-common.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/hw/arm/smmu-common.c b/hw/arm/smmu-common.c
> index 1ce706bf94..eb2356bc35 100644
> --- a/hw/arm/smmu-common.c
> +++ b/hw/arm/smmu-common.c
> @@ -381,6 +381,16 @@ static int smmu_ptw_64_s1(SMMUTransCfg *cfg,
>              goto error;
>          }
>  
> +        /*
> +         * The address output from the translation causes a stage 1 Address
> +         * Size fault if it exceeds the range of the effective IPA size for
> +         * the given CD.
> +         */
> +        if (gpa >= (1ULL << cfg->oas)) {
> +            info->type = SMMU_PTW_ERR_ADDR_SIZE;
> +            goto error;
> +        }
> +
>          tlbe->entry.translated_addr = gpa;
>          tlbe->entry.iova = iova & ~mask;
>          tlbe->entry.addr_mask = mask;
> -- 
> 2.45.2.803.g4e1b14247a-goog
>