arch/arm64/include/asm/kvm_mte.h

File Facts

System

Linux kernel

Corpus path

arch/arm64/include/asm/kvm_mte.h

Extension

.h

Size

1380 bytes

Lines

67

Domain

Architecture Layer

Bucket

arch/arm64

Inferred role

Architecture Layer: implementation source

Status

source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

• asm/sysreg.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#ifndef __ASM_KVM_MTE_H
#define __ASM_KVM_MTE_H

#ifdef __ASSEMBLER__

#include <asm/sysreg.h>

#ifdef CONFIG_ARM64_MTE

.macro mte_switch_to_guest g_ctxt, h_ctxt, reg1
alternative_if_not ARM64_MTE
	b	.L__skip_switch\@
alternative_else_nop_endif
	mrs	\reg1, hcr_el2
	tbz	\reg1, #(HCR_ATA_SHIFT), .L__skip_switch\@

	mrs_s	\reg1, SYS_RGSR_EL1
	str	\reg1, [\h_ctxt, #CPU_RGSR_EL1]
	mrs_s	\reg1, SYS_GCR_EL1
	str	\reg1, [\h_ctxt, #CPU_GCR_EL1]

	ldr	\reg1, [\g_ctxt, #CPU_RGSR_EL1]
	msr_s	SYS_RGSR_EL1, \reg1
	ldr	\reg1, [\g_ctxt, #CPU_GCR_EL1]
	msr_s	SYS_GCR_EL1, \reg1

.L__skip_switch\@:
.endm

.macro mte_switch_to_hyp g_ctxt, h_ctxt, reg1
alternative_if_not ARM64_MTE
	b	.L__skip_switch\@
alternative_else_nop_endif
	mrs	\reg1, hcr_el2
	tbz	\reg1, #(HCR_ATA_SHIFT), .L__skip_switch\@

	mrs_s	\reg1, SYS_RGSR_EL1
	str	\reg1, [\g_ctxt, #CPU_RGSR_EL1]
	mrs_s	\reg1, SYS_GCR_EL1
	str	\reg1, [\g_ctxt, #CPU_GCR_EL1]

	ldr	\reg1, [\h_ctxt, #CPU_RGSR_EL1]
	msr_s	SYS_RGSR_EL1, \reg1
	ldr	\reg1, [\h_ctxt, #CPU_GCR_EL1]
	msr_s	SYS_GCR_EL1, \reg1

	isb

.L__skip_switch\@:
.endm

#else /* !CONFIG_ARM64_MTE */

.macro mte_switch_to_guest g_ctxt, h_ctxt, reg1
.endm

.macro mte_switch_to_hyp g_ctxt, h_ctxt, reg1
.endm

#endif /* CONFIG_ARM64_MTE */
#endif /* __ASSEMBLER__ */
#endif /* __ASM_KVM_MTE_H */

Annotation

• Immediate include surface: `asm/sysreg.h`.
• Atlas domain: Architecture Layer / arch/arm64.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.