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KVM: Add documentation for kvm->srcu lock 

This patch documents the kvm->srcu lock (using the information from
a mail which has been posted by Marcelo Tosatti to the kvm mailing
list some months ago, see the following URL for details:
http://www.mail-archive.com/kvm@vger.kernel.org/msg90040.html )

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Thomas Huth 2013-09-09 17:32:56 +02:00 committed by Paolo Bonzini
parent 4a10c2ac2f
commit 519192aaae
1 changed files with 11 additions and 0 deletions
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11
Documentation/virtual/kvm/locking.txt
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@ -151,3 +151,14 @@ Type: spinlock_t
Arch: any Arch: any
Protects: -shadow page/shadow tlb entry Protects: -shadow page/shadow tlb entry
Comment: it is a spinlock since it is used in mmu notifier. Comment: it is a spinlock since it is used in mmu notifier.
Name: kvm->srcu
Type: srcu lock
Arch: any
Protects: - kvm->memslots
- kvm->buses
Comment: The srcu read lock must be held while accessing memslots (e.g.
when using gfn_to_* functions) and while accessing in-kernel
MMIO/PIO address->device structure mapping (kvm->buses).
The srcu index can be stored in kvm_vcpu->srcu_idx per vcpu
if it is needed by multiple functions.