drivers/gpu/drm/i915/gvt/kvmgt.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/i915/gvt/kvmgt.c

Extension

.c

Size

48559 bytes

Lines

1971

Domain

Driver Families

Bucket

drivers/gpu

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• 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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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/debugfs.h
• linux/eventfd.h
• linux/init.h
• linux/kthread.h
• linux/list.h
• linux/mdev.h
• linux/mm.h
• linux/nospec.h
• linux/rbtree.h
• linux/sched/mm.h
• linux/spinlock.h
• linux/types.h
• drm/drm_edid.h
• drm/drm_print.h
• gvt.h
• i915_drv.h
• intel_gvt.h
• sched_policy.h

Detected Declarations

• struct vfio_region
• struct intel_vgpu_regops
• struct vfio_region
• struct vfio_edid_region
• struct kvmgt_pgfn
• struct gvt_dma
• function intel_vgpu_show_description
• function gvt_unpin_guest_page
• function gvt_pin_guest_page
• function gvt_dma_map_page
• function gvt_dma_unmap_page
• function __gvt_cache_add
• function __gvt_cache_remove_entry
• function gvt_cache_destroy
• function gvt_cache_init
• function kvmgt_protect_table_init
• function kvmgt_protect_table_destroy
• function hash_for_each_safe
• function __kvmgt_protect_table_find
• function hash_for_each_possible
• function kvmgt_gfn_is_write_protected
• function kvmgt_protect_table_add
• function kvmgt_protect_table_del
• function intel_vgpu_reg_rw_opregion
• function intel_vgpu_reg_release_opregion
• function edid_valid
• function handle_edid_regs
• function offsetof
• function handle_edid_blob
• function intel_vgpu_reg_rw_edid
• function intel_vgpu_reg_release_edid
• function intel_vgpu_register_reg
• function intel_gvt_set_opregion
• function intel_gvt_set_edid
• function intel_vgpu_dma_unmap
• function __kvmgt_vgpu_exist
• function intel_vgpu_open_device
• function intel_vgpu_release_msi_eventfd_ctx
• function intel_vgpu_close_device
• function intel_vgpu_get_bar_addr
• function intel_vgpu_bar_rw
• function intel_vgpu_in_aperture
• function intel_vgpu_aperture_rw
• function intel_vgpu_rw
• function gtt_entry
• function intel_vgpu_read
• function intel_vgpu_write
• function intel_vgpu_mmap

Annotated Snippet

module_init(kvmgt_init);
module_exit(kvmgt_exit);

MODULE_DESCRIPTION("Intel mediated pass-through framework for KVM");
MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Intel Corporation");

Annotation

• Immediate include surface: `linux/debugfs.h`, `linux/eventfd.h`, `linux/init.h`, `linux/kthread.h`, `linux/list.h`, `linux/mdev.h`, `linux/mm.h`, `linux/nospec.h`.
• Detected declarations: `struct vfio_region`, `struct intel_vgpu_regops`, `struct vfio_region`, `struct vfio_edid_region`, `struct kvmgt_pgfn`, `struct gvt_dma`, `function intel_vgpu_show_description`, `function gvt_unpin_guest_page`, `function gvt_pin_guest_page`, `function gvt_dma_map_page`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: integration 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.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.