On Fri, Aug 13, 2021 at 11:59:21AM -0500, Tom Lendacky wrote:
In prep for other protected virtualization technologies, introduce a generic helper function, prot_guest_has(), that can be used to check for specific protection attributes, like memory encryption. This is intended to eliminate having to add multiple technology-specific checks to the code (e.g. if (sev_active() || tdx_active())).
Reviewed-by: Joerg Roedel jroedel@suse.de Co-developed-by: Andi Kleen ak@linux.intel.com Signed-off-by: Andi Kleen ak@linux.intel.com Co-developed-by: Kuppuswamy Sathyanarayanan sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Kuppuswamy Sathyanarayanan sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Tom Lendacky thomas.lendacky@amd.com
arch/Kconfig | 3 +++ include/linux/protected_guest.h | 35 +++++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) create mode 100644 include/linux/protected_guest.h
diff --git a/arch/Kconfig b/arch/Kconfig index 98db63496bab..bd4f60c581f1 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1231,6 +1231,9 @@ config RELR config ARCH_HAS_MEM_ENCRYPT bool
+config ARCH_HAS_PROTECTED_GUEST
- bool
config HAVE_SPARSE_SYSCALL_NR bool help diff --git a/include/linux/protected_guest.h b/include/linux/protected_guest.h new file mode 100644 index 000000000000..43d4dde94793 --- /dev/null +++ b/include/linux/protected_guest.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/*
- Protected Guest (and Host) Capability checks
- Copyright (C) 2021 Advanced Micro Devices, Inc.
- Author: Tom Lendacky thomas.lendacky@amd.com
- */
+#ifndef _PROTECTED_GUEST_H +#define _PROTECTED_GUEST_H
+#ifndef __ASSEMBLY__
^^^^^^^^^^^^^
Do you really need that guard? It builds fine without it too. Or something coming later does need it...?