drivers/vhost/test.c

File Facts

System

Linux kernel

Corpus path

drivers/vhost/test.c

Extension

.c

Size

8458 bytes

Lines

380

Domain

Driver Families

Bucket

drivers/vhost

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• 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.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/compat.h
• linux/eventfd.h
• linux/vhost.h
• linux/miscdevice.h
• linux/module.h
• linux/mutex.h
• linux/workqueue.h
• linux/file.h
• linux/slab.h
• test.h
• vhost.h

Detected Declarations

• struct vhost_test
• function handle_vq
• function handle_vq_kick
• function vhost_test_open
• function vhost_test_stop
• function vhost_test_flush
• function vhost_test_release
• function vhost_test_run
• function vhost_test_reset_owner
• function vhost_test_set_features
• function vhost_test_set_backend
• function vhost_test_ioctl

Annotated Snippet

static const struct file_operations vhost_test_fops = {
	.owner          = THIS_MODULE,
	.release        = vhost_test_release,
	.unlocked_ioctl = vhost_test_ioctl,
	.compat_ioctl   = compat_ptr_ioctl,
	.open           = vhost_test_open,
	.llseek		= noop_llseek,
};

static struct miscdevice vhost_test_misc = {
	MISC_DYNAMIC_MINOR,
	"vhost-test",
	&vhost_test_fops,
};
module_misc_device(vhost_test_misc);

MODULE_VERSION("0.0.1");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Michael S. Tsirkin");
MODULE_DESCRIPTION("Host kernel side for virtio simulator");

Annotation

• Immediate include surface: `linux/compat.h`, `linux/eventfd.h`, `linux/vhost.h`, `linux/miscdevice.h`, `linux/module.h`, `linux/mutex.h`, `linux/workqueue.h`, `linux/file.h`.
• Detected declarations: `struct vhost_test`, `function handle_vq`, `function handle_vq_kick`, `function vhost_test_open`, `function vhost_test_stop`, `function vhost_test_flush`, `function vhost_test_release`, `function vhost_test_run`, `function vhost_test_reset_owner`, `function vhost_test_set_features`.
• Atlas domain: Driver Families / drivers/vhost.
• 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.