Commit bfebd37e authored by Tom Lendacky's avatar Tom Lendacky Committed by Borislav Petkov
Browse files

powerpc/pseries/svm: Add a powerpc version of cc_platform_has() 



Introduce a powerpc version of the cc_platform_has() function. This will
be used to replace the powerpc mem_encrypt_active() implementation, so
the implementation will initially only support the CC_ATTR_MEM_ENCRYPT
attribute.

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Acked-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lkml.kernel.org/r/20210928191009.32551-5-bp@alien8.de
parent aa5a4611

arch/powerpc/platforms/pseries/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -159,6 +159,7 @@ config PPC_SVM 
	select SWIOTLB

	select ARCH_HAS_MEM_ENCRYPT

	select ARCH_HAS_FORCE_DMA_UNENCRYPTED

	select ARCH_HAS_CC_PLATFORM

	help

	 There are certain POWER platforms which support secure guests using

	 the Protected Execution Facility, with the help of an Ultravisor

arch/powerpc/platforms/pseries/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -31,3 +31,5 @@ obj-$(CONFIG_FA_DUMP) += rtas-fadump.o 


obj-$(CONFIG_SUSPEND)		+= suspend.o

obj-$(CONFIG_PPC_VAS)		+= vas.o



obj-$(CONFIG_ARCH_HAS_CC_PLATFORM)	+= cc_platform.o

arch/powerpc/platforms/pseries/cc_platform.c

0 → 100644
+26 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Confidential Computing Platform Capability checks

 *

 * Copyright (C) 2021 Advanced Micro Devices, Inc.

 *

 * Author: Tom Lendacky <thomas.lendacky@amd.com>

 */



#include <linux/export.h>

#include <linux/cc_platform.h>



#include <asm/machdep.h>

#include <asm/svm.h>



bool cc_platform_has(enum cc_attr attr)

{

	switch (attr) {

	case CC_ATTR_MEM_ENCRYPT:

		return is_secure_guest();



	default:

		return false;

	}

}

EXPORT_SYMBOL_GPL(cc_platform_has);