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Diffstat (limited to 'Documentation/virtual/kvm/locking.txt')
| -rw-r--r-- | Documentation/virtual/kvm/locking.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/locking.txt b/Documentation/virtual/kvm/locking.txt new file mode 100644 index 000000000000..3b4cd3bf5631 --- /dev/null +++ b/Documentation/virtual/kvm/locking.txt @@ -0,0 +1,25 @@ +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. |