linux/arch/x86/include/asm/shared/msr.h

/* 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 */
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			`/* 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 */`