On 9/8/21 10:58 PM, Tom Lendacky wrote:
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.
Cc: Michael Ellerman mpe@ellerman.id.au Cc: Benjamin Herrenschmidt benh@kernel.crashing.org Cc: Paul Mackerras paulus@samba.org Signed-off-by: Tom Lendacky thomas.lendacky@amd.com
arch/powerpc/platforms/pseries/Kconfig | 1 + arch/powerpc/platforms/pseries/Makefile | 2 ++ arch/powerpc/platforms/pseries/cc_platform.c | 26 ++++++++++++++++++++ 3 files changed, 29 insertions(+) create mode 100644 arch/powerpc/platforms/pseries/cc_platform.c
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index 5e037df2a3a1..2e57391e0778 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig @@ -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
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index 4cda0ef87be0..41d8aee98da4 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -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 diff --git a/arch/powerpc/platforms/pseries/cc_platform.c b/arch/powerpc/platforms/pseries/cc_platform.c new file mode 100644 index 000000000000..e8021af83a19 --- /dev/null +++ b/arch/powerpc/platforms/pseries/cc_platform.c @@ -0,0 +1,26 @@ +// 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) +{
Please keep this function inline as mem_encrypt_active() is
- switch (attr) {
- case CC_ATTR_MEM_ENCRYPT:
return is_secure_guest();- default:
return false;- }
+} +EXPORT_SYMBOL_GPL(cc_platform_has);