kexec, x86: Need a new e820 type support for kexec

[Baoquan He]

On 07/23/15 at 06:26pm, Toshi Kani wrote:
> Hello,
> 
> ACPI 6.0 defines a new type in e820, AddressRangePersistentMemory (7), for
> NVDIMM.  On a system with NVDIMM, kexec displays the following error
> message and sets it to RANGE_RESERVED as the fallback type.
> 
> Unknown type (Persistent Memory) while parsing
> /sys/firmware/memmap/34/type. Please report this as bug. Using
> RANGE_RESERVED now.
> 
> This new type is defined in "arch/x86/include/uapi/asm/e820.h" in 4.2-rc1
> as follows. 
> 
>   #define E820_PMEM       7

It need be added in struct e820entry:include/x86/x86-linux.h and
memory_range:kexec/kexec.h and their related handling. Could you give
more details about this memory type? I downloaded a ACPI 6.0 spec but
am not familiar with this.

> 
> kexec needs to know this new type, but I think its build env includes
> "/usr/include/asm/e820.h", which is provided by a distribution.  On Fedora
> 22, kernel-headers-4.0.6-300.fc22.x86_64 is the latest kernel header
> package and it will take a while for 4.2 headers.
> 
> How do we handle such kernel header dependency in the kexec build env?
> 
> Thanks,
> -Toshi
> 
> 
> 
> 
> 
> 
> 
> 
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