Re: [PATCH v3 1/5] mm/memory-failure: efi: add the LINUX_EFI_POISONED_MEMORY configuration table

[Kiryl Shutsemau <kas@kernel.org>]

On Wed, Aug 26, 2026 at 05:03:52AM -0700, Breno Leitao wrote:
> @@ -1271,6 +1274,16 @@ struct linux_efi_memreserve {
>  #define EFI_MEMRESERVE_COUNT(size) (((size) - sizeof(struct linux_efi_memreserve)) \
>  	/ sizeof_field(struct linux_efi_memreserve, entry[0]))
>  
> +/* Bit N covers unit N of physical address space, counting from address 0. */
> +struct linux_efi_poisoned_memory {
> +	u32		version;
> +	u32		unit_size;	/* bytes of phys space per bitmap bit */
> +	u64		size;		/* bitmap size in bytes */
> +	unsigned long	bitmap[];
> +};

struct efi_unaccepted_memory has 'phys_base'. Do we want it here too?

It can be helpful if physical memory starts very high for some reason.
I believe it is common for risc-v.

Tenstorrent Blackhole card has 4G of RAM based at 0x400030000000.
Counting from address 0 that is a 4M bitmap for 4G of RAM. :-/

-- 
  Kiryl Shutsemau / Kirill A. Shutemov