Michael Ellerman <m...@ellerman.id.au> writes:
> Thiago Jung Bauermann <bauer...@linux.ibm.com> writes: >> Michael Ellerman <m...@ellerman.id.au> writes: >>> Thiago Jung Bauermann <bauer...@linux.ibm.com> writes: >>>> From: Anshuman Khandual <khand...@linux.vnet.ibm.com> >>>> >>>> LPPACA structures need to be shared with the host. Hence they need to be in >>>> shared memory. Instead of allocating individual chunks of memory for a >>>> given structure from memblock, a contiguous chunk of memory is allocated >>>> and then converted into shared memory. Subsequent allocation requests will >>>> come from the contiguous chunk which will be always shared memory for all >>>> structures. >>>> >>>> While we are able to use a kmem_cache constructor for the Debug Trace Log, >>>> LPPACAs are allocated very early in the boot process (before SLUB is >>>> available) so we need to use a simpler scheme here. >>>> >>>> Introduce helper is_svm_platform() which uses the S bit of the MSR to tell >>>> whether we're running as a secure guest. >>>> >>>> Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com> >>>> Signed-off-by: Thiago Jung Bauermann <bauer...@linux.ibm.com> >>>> --- >>>> arch/powerpc/include/asm/svm.h | 26 ++++++++++++++++++++ >>>> arch/powerpc/kernel/paca.c | 43 +++++++++++++++++++++++++++++++++- >>>> 2 files changed, 68 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/arch/powerpc/include/asm/svm.h >>>> b/arch/powerpc/include/asm/svm.h >>>> new file mode 100644 >>>> index 000000000000..fef3740f46a6 >>>> --- /dev/null >>>> +++ b/arch/powerpc/include/asm/svm.h >>>> @@ -0,0 +1,26 @@ >>>> +/* SPDX-License-Identifier: GPL-2.0+ */ >>>> +/* >>>> + * SVM helper functions >>>> + * >>>> + * Copyright 2019 Anshuman Khandual, IBM Corporation. >>> >>> Are we sure this copyright date is correct? >> >> I may be confused about which year the copyright refers to. I thought it >> was the year when the patch was committed. If it is the first time the >> patch was published then this one should be 2018. > > I'm not a lawyer etc. but AIUI the date above is about the authorship, > ie. when it was originally written, not when it was published or > committed. > > In general I don't think it matters too much, but in this case I'm > pretty sure Anshuman can't have possibly written it in 2019 on behalf of > IBM :) > > So we can either change the date to 2018, or drop his name and just say > it's copyright 2019 by IBM. I think it's better to change the date to 2018. The same should be done for svm.c, svm.h and mem_encrypt.h. I'll send a new patch series with the correction. -- Thiago Jung Bauermann IBM Linux Technology Center
