linux/Documentation/virtual/kvm/locking.txt
Rob Landley ed16648eb5 Move kvm, uml, and lguest subdirectories under a common "virtual" directory, I.E:
cd Documentation
  mkdir virtual
  git mv kvm uml lguest virtual

Signed-off-by: Rob Landley <rlandley@parallels.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
2011-05-06 09:22:02 -07:00

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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.