Re: [Xen-devel] [PATCH v3 5/6] xen/arm: don't iomem_permit_access for reserved-memory regions

[Julien Grall <julien.grall@xxxxxxx>]

Hi Stefano,

On 6/22/19 12:56 AM, Stefano Stabellini wrote:
> Don't allow reserved-memory regions to be remapped into any guests,
> until reserved-memory regions are properly supported in Xen. For now,
> do not call iomem_permit_access for them.
>
> Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
> ---
> Changes in v4:
> - new patch
> ---
>   xen/arch/arm/domain_build.c | 23 +++++++++++++++--------
>   1 file changed, 15 insertions(+), 8 deletions(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index d9836779d1..76dd4bf6f9 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1158,15 +1158,22 @@ static int __init map_range_to_domain(const struct 
> dt_device_node *dev,
>       bool need_mapping = !dt_device_for_passthrough(dev);
>       int res;
>   
> -    res = iomem_permit_access(d, paddr_to_pfn(addr),
> -                              paddr_to_pfn(PAGE_ALIGN(addr + len - 1)));
> -    if ( res )
> +    /*
> +     * Don't give iomem permissions for reserved-memory ranges until
> +     * reserved-memory support is complete.
> +     */
> +    if ( strcmp(dt_node_name(dev), "reserved-memory") )
Aside Oleksandr's comment, you should technically use dt_node_cmp(...) 
for comparing node name.
>       {
> -        printk(XENLOG_ERR "Unable to permit to dom%d access to"
> -               " 0x%"PRIx64" - 0x%"PRIx64"\n",
> -               d->domain_id,
> -               addr & PAGE_MASK, PAGE_ALIGN(addr + len) - 1);
> -        return res;
> +        res = iomem_permit_access(d, paddr_to_pfn(addr),
> +                                  paddr_to_pfn(PAGE_ALIGN(addr + len - 1)));
> +        if ( res )
> +        {
> +            printk(XENLOG_ERR "Unable to permit to dom%d access to"
> +                   " 0x%"PRIx64" - 0x%"PRIx64"\n",
> +                   d->domain_id,
> +                   addr & PAGE_MASK, PAGE_ALIGN(addr + len) - 1);
> +            return res;
> +        }
>       }
>   
>       if ( need_mapping )
Cheers,

--
Julien Grall

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