This website requires JavaScript.
About
Status
₊˚⊹Discord
Explore
Register
Sign in
Reference in a new issue
Blame
Copy permalink
Reference in a new issue
Copy permalink
kernel
/
linux
Star
0
Fork
You've already forked linux
0
mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
synced
2026-11-15 19:56:03 +00:00
Code
Issues
Releases
Packages
Activity
3389648819
linux
/
arch
/
x86
/
include
/
asm
/
shared
/
msr.h
30 lines
680 B
Raw
Normal View
History
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
2022-02-09 12:09:59 -06:00
x86/boot: Move boot_*msr helpers to asm/shared/msr.h The boot_{rdmsr,wrmsr}() helpers are *just* the barebones MSR access functionality, without any tracing or exception handling glue as it is done in kernel proper. Move these helpers to asm/shared/msr.h and rename to raw_{rdmsr,wrmsr}() to indicate what they are. [ bp: Correct the reason why those helpers exist. I should've caught that in the original patch that added them: 176db622573f ("x86/boot: Introduce helpers for MSR reads/writes" but oh well... - fixup include path delimiters to <> ] Signed-off-by: John Allen <john.allen@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://patch.msgid.link/all/20250924200852.4452-2-john.allen@amd.com
2025-09-24 20:08:51 +00:00
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
2022-02-09 12:09:59 -06:00
