diff options
| author | Michael Roth <michael.roth@amd.com> | 2022-02-09 21:09:59 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2022-04-06 13:59:17 +0300 |
| commit | 176db622573f028f85221873ea4577e096785315 (patch) | |
| tree | 3202dd9001030fc4a5033615da147ddf7b7446e6 /arch/x86/include/asm/shared | |
| parent | 6d3b3d34e39eb4ee9a7dbe7e28e2588e160f9c0f (diff) | |
| download | linux-176db622573f028f85221873ea4577e096785315.tar.xz | |
x86/boot: Introduce helpers for MSR reads/writes
The current set of helpers used throughout the run-time kernel have
dependencies on code/facilities outside of the boot kernel, so there
are a number of call-sites throughout the boot kernel where inline
assembly is used instead. More will be added with subsequent patches
that add support for SEV-SNP, so take the opportunity to provide a basic
set of helpers that can be used by the boot kernel to reduce reliance on
inline assembly.
Use boot_* prefix so that it's clear these are helpers specific to the
boot kernel to avoid any confusion with the various other MSR read/write
helpers.
[ bp: Disambiguate parameter names and trim comment. ]
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220307213356.2797205-6-brijesh.singh@amd.com
Diffstat (limited to 'arch/x86/include/asm/shared')
| -rw-r--r-- | arch/x86/include/asm/shared/msr.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/include/asm/shared/msr.h b/arch/x86/include/asm/shared/msr.h new file mode 100644 index 000000000000..1e6ec10b3a15 --- /dev/null +++ b/arch/x86/include/asm/shared/msr.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_SHARED_MSR_H +#define _ASM_X86_SHARED_MSR_H + +struct msr { + union { + struct { + u32 l; + u32 h; + }; + u64 q; + }; +}; + +#endif /* _ASM_X86_SHARED_MSR_H */ |