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Re: [PATCH v1 6/6] xen/riscv: relocating and unflattening host device tree
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 9 Dec 2024 16:57:54 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 09 Dec 2024 15:58:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 09.12.2024 16:56, Jan Beulich wrote:
> On 27.11.2024 13:50, Oleksii Kurochko wrote:
>> Relocate FDT to Xen heap instead of using early mapping as it is
>> expected that discard_initial_modules() ( is supposed to call in
>> the future ) discards the FDT boot module and remove_early_mappings()
>> destroys the early mapping.
>>
>> Unflatten a device tree, creating the tree of struct device_node.
>> It also fills the "name" and "type" pointers of the nodes so the normal
>> device-tree walking functions can be used.
>>
>> Set device_tree_flattened to NULL in the case when acpi_disabled is
>> equal to false.
>>
>> Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Albeit ...
>
>> @@ -71,6 +72,7 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
>> paddr_t dtb_addr)
>> {
>> const char *cmdline;
>> + size_t fdt_size;
>>
>> remove_identity_mapping();
>>
>> @@ -95,7 +97,7 @@ void __init noreturn start_xen(unsigned long bootcpu_id,
>> _end - _start, false) )
>> panic("Failed to add BOOTMOD_XEN\n");
>>
>> - if ( !boot_fdt_info(device_tree_flattened, dtb_addr) )
>> + if ( !(fdt_size = boot_fdt_info(device_tree_flattened, dtb_addr)) )
>> BUG();
>
> ... perhaps better
>
> fdt_size = boot_fdt_info(device_tree_flattened, dtb_addr);
> BUG_ON(!fdt_size);
>
> ?
And then I notice that Arm has no such check at all. Better stay in sync?
Jan
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