Re: [Xen-devel] [PATCH v2 3/3] xen/arm: fix duplicate memory node in DT

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 10/8/19 2:15 AM, Stefano Stabellini wrote:
> When reserved-memory regions are present in the host device tree, dom0
> is started with multiple memory nodes. Each memory node should have a
> unique name, but today they are all called "memory" leading to Linux
> printing the following warning at boot:
>
>    OF: Duplicate name in base, renamed to "memory#1"
>
> This patch fixes the problem by appending a "@<unit-address>" to the
> name, as per the Device Tree specification, where <unit-address> matches
> the base of address of the first region.
>
> Fixes: 248faa637d2 (xen/arm: add reserved-memory regions to the dom0 memory 
> node)
> Reported-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

Cheers,

> ---
> Changes in v2:
> - fix buf size calculation: the number is 64bit and printed as
>    hexadecimal
> - move check on nr_banks to a separate patch
> ---
>   xen/arch/arm/domain_build.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
> index ea01aada0b..3de4dafaed 100644
> --- a/xen/arch/arm/domain_build.c
> +++ b/xen/arch/arm/domain_build.c
> @@ -646,6 +646,8 @@ static int __init make_memory_node(const struct domain *d,
>       int res, i;
>       int reg_size = addrcells + sizecells;
>       int nr_cells = reg_size * mem->nr_banks;
> +    /* Placeholder for memory@ + a 64-bit number + \0 */
> +    char buf[24];
>       __be32 reg[NR_MEM_BANKS * 4 /* Worst case addrcells + sizecells */];
>       __be32 *cells;
>   
> @@ -657,7 +659,8 @@ static int __init make_memory_node(const struct domain *d,
>                  reg_size, nr_cells);
>   
>       /* ePAPR 3.4 */
> -    res = fdt_begin_node(fdt, "memory");
> +    snprintf(buf, sizeof(buf), "memory@%"PRIx64, mem->bank[0].start);
> +    res = fdt_begin_node(fdt, buf);
>       if ( res )
>           return res;
>   
--
Julien Grall

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