KVM: Start lock documentation (38a778aa) · Commits · 戴 / test

The goal of this document shall be - overview of all locks used in KVM core - provide details on the scope of each lock - explain the lock type, specifically of a raw spin locks - provide a lock ordering guide Signed-off-by:

Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:

Avi Kivity <avi@redhat.com>

Documentation/kvm/locking.txt

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Original line number	Diff line number	Diff line
		KVM Lock Overview
		=================

		1. Acquisition Orders
		---------------------

		(to be written)

		2. Reference
		------------

		Name: kvm_lock
		Type: raw_spinlock
		Arch: any
		Protects: - vm_list
		- hardware virtualization enable/disable
		Comment: 'raw' because hardware enabling/disabling must be atomic /wrt
		migration.

		Name: kvm_arch::tsc_write_lock
		Type: raw_spinlock
		Arch: x86
		Protects: - kvm_arch::{last_tsc_write,last_tsc_nsec,last_tsc_offset}
		- tsc offset in vmcb
		Comment: 'raw' because updating the tsc offsets must not be preempted.

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