tools/testing/selftests/kvm/include/s390/ucall.h

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/kvm/include/s390/ucall.h

Extension

.h

Size

436 bytes

Lines

20

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• kvm_util.h

Detected Declarations

• function ucall_arch_init

Annotated Snippet

#ifndef SELFTEST_KVM_UCALL_H
#define SELFTEST_KVM_UCALL_H

#include "kvm_util.h"

#define UCALL_EXIT_REASON       KVM_EXIT_S390_SIEIC

static inline void ucall_arch_init(struct kvm_vm *vm, gpa_t mmio_gpa)
{
}

static inline void ucall_arch_do_ucall(gva_t uc)
{
	/* Exit via DIAGNOSE 0x501 (normally used for breakpoints) */
	asm volatile ("diag 0,%0,0x501" : : "a"(uc) : "memory");
}

#endif

Annotation

• Immediate include surface: `kvm_util.h`.
• Detected declarations: `function ucall_arch_init`.
• Atlas domain: Support Tooling And Documentation / tools.
• 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.