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| author | Paolo Bonzini <pbonzini@redhat.com> | 2013-09-10 12:58:35 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-09-30 09:21:46 +0200 |
| commit | 4a937f96f3a29c58b7edd349d2e4dfac371efdf2 (patch) | |
| tree | 67471522814264ea197e724a1ca09a424bdbba6c /Documentation/virtual | |
| parent | 4fa92fb25ae5a2d79d872ab54df511c831b1f363 (diff) | |
| download | lwn-4a937f96f3a29c58b7edd349d2e4dfac371efdf2.tar.gz lwn-4a937f96f3a29c58b7edd349d2e4dfac371efdf2.zip | |
KVM: protect kvm_usage_count with its own spinlock
The VM list need not be protected by a raw spinlock. Separate the
two so that kvm_lock can be made non-raw.
Cc: kvm@vger.kernel.org
Cc: gleb@redhat.com
Cc: jan.kiszka@siemens.com
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/locking.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/Documentation/virtual/kvm/locking.txt b/Documentation/virtual/kvm/locking.txt index a9f366e73c8e..ba9e1c2150c2 100644 --- a/Documentation/virtual/kvm/locking.txt +++ b/Documentation/virtual/kvm/locking.txt @@ -135,7 +135,11 @@ Name: kvm_lock Type: raw_spinlock Arch: any Protects: - vm_list - - hardware virtualization enable/disable + +Name: kvm_count_lock +Type: raw_spinlock_t +Arch: any +Protects: - hardware virtualization enable/disable Comment: 'raw' because hardware enabling/disabling must be atomic /wrt migration. |