virt/kvm/Kconfig

File Facts

System

Linux kernel

Corpus path

virt/kvm/Kconfig

Extension

[no extension]

Size

2380 bytes

Lines

121

Domain

Kernel Services

Bucket

virt

Inferred role

Kernel Services: build/configuration rule

Status

atlas-only

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

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

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0
# KVM common configuration items and defaults

config KVM_COMMON
       bool
       select EVENTFD
       select INTERVAL_TREE
       select MMU_NOTIFIER
       select PREEMPT_NOTIFIERS

config HAVE_KVM_PFNCACHE
       bool

config HAVE_KVM_IRQCHIP
       bool

config HAVE_KVM_IRQ_ROUTING
       bool

config HAVE_KVM_DIRTY_RING
       bool

# Only strongly ordered architectures can select this, as it doesn't
# put any explicit constraint on userspace ordering. They can also
# select the _ACQ_REL version.
config HAVE_KVM_DIRTY_RING_TSO
       bool
       select HAVE_KVM_DIRTY_RING
       depends on X86

# Weakly ordered architectures can only select this, advertising
# to userspace the additional ordering requirements.
config HAVE_KVM_DIRTY_RING_ACQ_REL
       bool
       select HAVE_KVM_DIRTY_RING

# Allow enabling both the dirty bitmap and dirty ring. Only architectures
# that need to dirty memory outside of a vCPU context should select this.
config NEED_KVM_DIRTY_RING_WITH_BITMAP
	bool
	depends on HAVE_KVM_DIRTY_RING

config KVM_MMIO
       bool

config KVM_ASYNC_PF
       bool

# Toggle to switch between direct notification and batch job
config KVM_ASYNC_PF_SYNC
       bool

config HAVE_KVM_MSI
       bool

config HAVE_KVM_READONLY_MEM
       bool

config HAVE_KVM_CPU_RELAX_INTERCEPT
       bool

config KVM_VFIO
       bool

config HAVE_KVM_INVALID_WAKEUPS
       bool

config KVM_GENERIC_DIRTYLOG_READ_PROTECT
       bool

Annotation

• Atlas domain: Kernel Services / virt.
• Implementation status: atlas-only.
• 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.