arch/powerpc/kvm/timing.c

File Facts

System

Linux kernel

Corpus path

arch/powerpc/kvm/timing.c

Extension

.c

Size

6187 bytes

Lines

214

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: operation-table or driver-model contract

Status

pattern 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kvm_host.h
• linux/fs.h
• linux/seq_file.h
• linux/debugfs.h
• linux/uaccess.h
• linux/module.h
• asm/time.h
• asm-generic/div64.h
• timing.h

Detected Declarations

• function kvmppc_init_timing_stats
• function add_exit_timing
• function kvmppc_update_timing_stats
• function kvmppc_exit_timing_show
• function kvmppc_exit_timing_write
• function kvmppc_exit_timing_open
• function kvmppc_create_vcpu_debugfs_e500

Annotated Snippet

static const struct file_operations kvmppc_exit_timing_fops = {
	.owner   = THIS_MODULE,
	.open    = kvmppc_exit_timing_open,
	.read    = seq_read,
	.write   = kvmppc_exit_timing_write,
	.llseek  = seq_lseek,
	.release = single_release,
};

int kvmppc_create_vcpu_debugfs_e500(struct kvm_vcpu *vcpu,
				    struct dentry *debugfs_dentry)
{
	debugfs_create_file("timing", 0666, debugfs_dentry,
			    vcpu, &kvmppc_exit_timing_fops);
	return 0;
}

Annotation

• Immediate include surface: `linux/kvm_host.h`, `linux/fs.h`, `linux/seq_file.h`, `linux/debugfs.h`, `linux/uaccess.h`, `linux/module.h`, `asm/time.h`, `asm-generic/div64.h`.
• Detected declarations: `function kvmppc_init_timing_stats`, `function add_exit_timing`, `function kvmppc_update_timing_stats`, `function kvmppc_exit_timing_show`, `function kvmppc_exit_timing_write`, `function kvmppc_exit_timing_open`, `function kvmppc_create_vcpu_debugfs_e500`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.