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. cheers