On Wed, Dec 04, 2019 at 06:17:59PM +0000, James Morse wrote: > 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 Thanks a lot! It worked and the issue is gone with Ard's patch and the linaro kexec (arm64/resv_mem branch). Ard, please feel free to add: Tested-by: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx> > > > > 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. I used the kexec on the top of master branch: git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git Should we use the linaro kexec for aarch64 machine? Or will the arm64/resv_mem branch be merged to the kexec on git.kernel.org...? Thanks! Masa _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
