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authorPaolo Bonzini <pbonzini@redhat.com>2013-09-10 12:58:35 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2013-09-30 09:21:46 +0200
commit4a937f96f3a29c58b7edd349d2e4dfac371efdf2 (patch)
tree67471522814264ea197e724a1ca09a424bdbba6c /Documentation/virtual
parent4fa92fb25ae5a2d79d872ab54df511c831b1f363 (diff)
downloadlinux-4a937f96f3a29c58b7edd349d2e4dfac371efdf2.tar.bz2
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.txt6
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.