The following commit has been merged into the x86/cc branch of tip: Commit-ID: bfebd37e99dece9c83a373cf9f35def440fdd5df Gitweb: https://git.kernel.org/tip/bfebd37e99dece9c83a373cf9f35def440fdd5df Author: Tom Lendacky <thomas.lendacky@xxxxxxx> AuthorDate: Wed, 08 Sep 2021 17:58:35 -05:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Mon, 04 Oct 2021 11:46:33 +02:00 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: Tom Lendacky <thomas.lendacky@xxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Acked-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20210928191009.32551-5-bp@xxxxxxxxx --- 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 5e037df..2e57391 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 4cda0ef..41d8aee 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 0000000..e8021af --- /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@xxxxxxx> + */ + +#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);
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