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| author | Thomas Huth <thuth@linux.vnet.ibm.com> | 2013-09-09 17:32:56 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-09-24 19:12:12 +0200 |
| commit | 519192aaae38e24d6b32d3d55d791fe294981185 (patch) | |
| tree | d813696b9b6b1837b7396d399bd6283d3a1e7da7 /Documentation/virtual | |
| parent | 4a10c2ac2f368583138b774ca41fac4207911983 (diff) | |
| download | blackbird-op-linux-519192aaae38e24d6b32d3d55d791fe294981185.tar.gz blackbird-op-linux-519192aaae38e24d6b32d3d55d791fe294981185.zip | |
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>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/locking.txt | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/locking.txt b/Documentation/virtual/kvm/locking.txt index 41b7ac9884b5..a9f366e73c8e 100644 --- a/Documentation/virtual/kvm/locking.txt +++ b/Documentation/virtual/kvm/locking.txt @@ -151,3 +151,14 @@ Type: spinlock_t Arch: any Protects: -shadow page/shadow tlb entry 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. |
