Re: [Xen-devel] [PATCH v8 8/8] xen/arm: map reserved-memory regions as normal memory in dom0

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 09/10/2018 00:37, Stefano Stabellini wrote:
> reserved-memory regions should be mapped as normal memory.
This is already the case with p2m_mmio_direct_c. The hardware domain 
should have full control on the resulting attributes via its stage-1 
mappings. So what's wrong with that p2m type?
Cheers,

>  At the
> moment, they get remapped as device memory because Xen doesn't know
> better. Add an explicit check for it.
>
> Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
> ---
>   xen/arch/arm/domain_build.c | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index f552154..c7df4cf 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -1307,6 +1307,13 @@ static int __init handle_node(struct domain *d, struct 
> kernel_info *kinfo,
>                  "WARNING: Path %s is reserved, skip the node as we may re-use the 
> path.\n",
>                  path);
>   
> +    /*
> +     * reserved-memory ranges should be mapped as normal memory in the
> +     * p2m.
> +     */
> +    if ( !strcmp(dt_node_name(node), "reserved-memory") )
> +        p2mt = p2m_ram_rw;
> +
>       res = handle_device(d, node, p2mt);
>       if ( res)
>           return res;
--
Julien Grall

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