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powerpc/pseries/svm: Use shared memory for LPPACA structures

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820021326.6884-9-bauerman@linux.ibm.com
This commit is contained in:
Anshuman Khandual
2019-08-19 23:13:18 -03:00
committed by Michael Ellerman
parent e311a92da1
commit bd104e6db6
2 changed files with 68 additions and 1 deletions
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26
arch/powerpc/include/asm/svm.h Normal file
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@@ -0,0 +1,26 @@
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* SVM helper functions
*
* Copyright 2018 Anshuman Khandual, IBM Corporation.
*/
#ifndef _ASM_POWERPC_SVM_H
#define _ASM_POWERPC_SVM_H
#ifdef CONFIG_PPC_SVM
static inline bool is_secure_guest(void)
{
return mfmsr() & MSR_S;
}
#else /* CONFIG_PPC_SVM */
static inline bool is_secure_guest(void)
{
return false;
}
#endif /* CONFIG_PPC_SVM */
#endif /* _ASM_POWERPC_SVM_H */