kexec, x86: Need a new e820 type support for kexec
bhe at redhat.com
Thu Jul 23 22:50:53 PDT 2015
On 07/24/15 at 01:31pm, Baoquan He wrote:
> 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
Let me check this and try to make a patch, it may need your help to test
> 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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