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| author |   Feng Wu <feng.wu@intel.com> | 2015-09-18 22:29:55 +0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2015-10-01 15:06:53 +0200 |
| commit | bf9f6ac8d74969690df1485b33b7c238ca9f2269 (patch) | |
| tree | cfaa21f2831d959dca9bdb4c4ad9e329fec4d5e8 /Documentation/virtual | |
| parent | KVM: Update Posted-Interrupts Descriptor when vCPU is preempted (diff) | |
| download | linux-dev-bf9f6ac8d74969690df1485b33b7c238ca9f2269.tar.xz linux-dev-bf9f6ac8d74969690df1485b33b7c238ca9f2269.zip | |
KVM: Update Posted-Interrupts Descriptor when vCPU is blocked
This patch updates the Posted-Interrupts Descriptor when vCPU
is blocked.
pre-block:
- Add the vCPU to the blocked per-CPU list
- Set 'NV' to POSTED_INTR_WAKEUP_VECTOR
post-block:
- Remove the vCPU from the per-CPU list
Signed-off-by: Feng Wu <feng.wu@intel.com>
[Concentrate invocation of pre/post-block hooks to vcpu_block. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/locking.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/locking.txt b/Documentation/virtual/kvm/locking.txt index d68af4dc3006..19f94a6b9bb0 100644 --- a/Documentation/virtual/kvm/locking.txt +++ b/Documentation/virtual/kvm/locking.txt @@ -166,3 +166,15 @@ Comment: The srcu read lock must be held while accessing memslots (e.g. 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. + +Name: blocked_vcpu_on_cpu_lock +Type: spinlock_t +Arch: x86 +Protects: blocked_vcpu_on_cpu +Comment: This is a per-CPU lock and it is used for VT-d posted-interrupts. + When VT-d posted-interrupts is supported and the VM has assigned + devices, we put the blocked vCPU on the list blocked_vcpu_on_cpu + protected by blocked_vcpu_on_cpu_lock, when VT-d hardware issues + wakeup notification event since external interrupts from the + assigned devices happens, we will find the vCPU on the list to + wakeup. |