Re: grub causing NVDIMMs to be treated as normal memory

[Andrei Borzenkov]

25.11.2015 02:52, Elliott, Robert (Persistent Memory) пишет:
> We've noticed that some combinations of grub and old linux kernels
> 
> end up interpreting the UEFI memory map EfiPersistentMemory type 14
> 
> (formerly a reserved value) as regular memory in the linux e820
> 
> table, causing silent data corruption on the NVDIMMs.  That occurs
> 
> even though grub prints this message suggesting everything is safe:
> 
>     Unknown memory type 14, considering reserved
> 
> 
> 
> In broken versions of grub, the code parsing the UEFI memory map
> 
> has a "default" case that falls through to the
> 
> GRUB_EFI_BOOT_SERVICES_DATA case, which marks the memory range
> 
> as GRUB_MEMORY_AVAILABLE and ends up in e820 as regular memory.
> 

Could you test if attached patch works for you (compile tested)?

efi-unknown-memory-type.patch
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