Hi Masa, On 04/12/2019 17:17, Masayoshi Mizuma wrote: > Thank you for sending the patch, but unfortunately it doesn't work for the issue... > > After applied your patch, the LPI tables are marked as reserved in > /proc/iomem like as: > > 80300000-a1fdffff : System RAM > 80480000-8134ffff : Kernel code > 81350000-817bffff : reserved > 817c0000-82acffff : Kernel data > 830f0000-830fffff : reserved # Property table > 83480000-83480fff : reserved # Pending table > 83490000-8349ffff : reserved # Pending table > > However, kexec tries to allocate memory from System RAM, it doesn't care > the reserved in System RAM. > I'm not sure why kexec doesn't care the reserved in System RAM, however, Hmm, we added these to fix a problem with the UEFI memory map, and more recently ACPI tables being overwritten by kexec. Which version of kexec-tools are you using? Could you try: https://git.linaro.org/people/takahiro.akashi/kexec-tools.git/commit/?h=arm64/resv_mem > if the kexec behaivor is right, the LPI tables should not belong to > System RAM. > Like as: > > 80300000-830effff : System RAM > 80480000-8134ffff : Kernel code > 81350000-817bffff : reserved > 817c0000-82acffff : Kernel data > 830f0000-830fffff : reserved # Property table > 83480000-83480fff : reserved # Pending table > 83490000-8349ffff : reserved # Pending table > 834a0000-a1fdffff : System RAM > > I don't have ideas to separete LPI tables from System RAM... so I tried > to add a new file to inform the LPI tables to userspace. This is how 'nomap' memory appears, we carve it out of System RAM. A side effect of this is kdump can't touch it, as you've told it this isn't memory. As these tables are memory, mapped by the linear map, I think Ard's patch is the right thing to do ... I suspect your kexec-tools doesn't have those patches from Akashi to make it honour all second level entries. Thanks, James
