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KVM: protect kvm_usage_count with its own spinlock

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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>
This commit is contained in:
Paolo Bonzini
2013-09-10 12:58:35 +02:00
parent 4fa92fb25a
commit 4a937f96f3
2 changed files with 15 additions and 10 deletions
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6
Documentation/virtual/kvm/locking.txt
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@@ -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.