Messages in this thread | | | From | Michael Ellerman <> | Subject | Re: [PATCH v3 08/16] powerpc/pseries/svm: Use shared memory for LPPACA structures | Date | Mon, 12 Aug 2019 22:36:11 +1000 |
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Thiago Jung Bauermann <bauerman@linux.ibm.com> writes: > From: Anshuman Khandual <khandual@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 <khandual@linux.vnet.ibm.com> > Signed-off-by: Thiago Jung Bauermann <bauerman@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?
cheers
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