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Re: [PATCH] xen/arm: bootfdt: Ignore empty memory bank


  • To: Julien Grall <julien@xxxxxxx>
  • From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
  • Date: Mon, 21 Sep 2020 12:24:24 +0000
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  • Cc: "open list:X86" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Daniel Wagner <Daniel.Wagner2@xxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 21 Sep 2020 12:25:08 +0000
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  • Thread-topic: [PATCH] xen/arm: bootfdt: Ignore empty memory bank


> On 18 Sep 2020, at 18:11, Julien Grall <julien@xxxxxxx> wrote:
> 
> From: Julien Grall <jgrall@xxxxxxxxxx>
> 
> At the moment, Xen will stop processing the Device Tree if a memory
> bank is empty (size == 0).
> 
> Unfortunately, some of the Device Tree (such as on Colibri imx8qxp)
> may contain such a bank. This means Xen will not be able to boot
> properly.
> 
> Relax the check to just ignore the banks. FWIW this also seems to be the
> behavior adopted by Linux.
> 
> Reported-by: Daniel Wagner <Daniel.Wagner2@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>

Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>

> ---
> xen/arch/arm/bootfdt.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
> index 08fb59f4e7a9..dcff512648a0 100644
> --- a/xen/arch/arm/bootfdt.c
> +++ b/xen/arch/arm/bootfdt.c
> @@ -163,8 +163,9 @@ static int __init process_memory_node(const void *fdt, 
> int node,
>     for ( i = 0; i < banks && mem->nr_banks < NR_MEM_BANKS; i++ )
>     {
>         device_tree_get_reg(&cell, address_cells, size_cells, &start, &size);
> +        /* Some DT may describe empty bank, ignore them */
>         if ( !size )
> -            return -EINVAL;
> +            continue;
>         mem->bank[mem->nr_banks].start = start;
>         mem->bank[mem->nr_banks].size = size;
>         mem->nr_banks++;
> -- 
> 2.17.1
> 
> 




 


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