Re: [PATCH v3 4/8] powerpc/pseries/svm: Add a powerpc version of cc_platform_has()
From: Christophe Leroy <hidden>
Date: 2021-09-09 07:41:00
Also in:
amd-gfx, dri-devel, kexec, kvm, linux-efi, linux-fsdevel, linux-iommu, linux-s390, lkml, platform-driver-x86
On 9/8/21 10:58 PM, Tom Lendacky wrote:
quoted hunk ↗ jump to hunk
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 <redacted> 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.cdiff --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 Ultravisordiff --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.odiff --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);