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authorPaolo Bonzini2022-03-22 12:07:19 +0100
committerPaolo Bonzini2022-03-29 13:21:19 -0400
commite9611bf9d24a259193290f6ac8d33844a054c8f7 (patch)
treebaeef227be5401b4b7223a12fbccd8327e67c79f /Documentation/virt
parent07ea4ab1f9b83953ff5c3f6ccfb84d581bfe0046 (diff)
Documentation: kvm: fixes for locking.rst
Separate the various locks clearly, and include the new names of blocked_vcpu_on_cpu_lock and blocked_vcpu_on_cpu. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20220322110720.222499-2-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'Documentation/virt')
-rw-r--r--Documentation/virt/kvm/locking.rst28
1 files changed, 19 insertions, 9 deletions
diff --git a/Documentation/virt/kvm/locking.rst b/Documentation/virt/kvm/locking.rst
index 5d27da356836..6c9aa4f49608 100644
--- a/Documentation/virt/kvm/locking.rst
+++ b/Documentation/virt/kvm/locking.rst
@@ -210,32 +210,41 @@ time it will be set using the Dirty tracking mechanism described above.
3. Reference
------------
-:Name: kvm_lock
+``kvm_lock``
+^^^^^^^^^^^^
+
:Type: mutex
:Arch: any
:Protects: - vm_list
-:Name: kvm_count_lock
+``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.
-:Name: kvm_arch::tsc_write_lock
-:Type: raw_spinlock
+
+``kvm_arch::tsc_write_lock``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+:Type: raw_spinlock_t
:Arch: x86
:Protects: - kvm_arch::{last_tsc_write,last_tsc_nsec,last_tsc_offset}
- tsc offset in vmcb
:Comment: 'raw' because updating the tsc offsets must not be preempted.
-:Name: kvm->mmu_lock
-:Type: spinlock_t
+``kvm->mmu_lock``
+^^^^^^^^^^^^^^^^^
+:Type: spinlock_t or rwlock_t
:Arch: any
:Protects: -shadow page/shadow tlb entry
:Comment: it is a spinlock since it is used in mmu notifier.
-:Name: kvm->srcu
+``kvm->srcu``
+^^^^^^^^^^^^^
:Type: srcu lock
:Arch: any
:Protects: - kvm->memslots
@@ -246,10 +255,11 @@ time it will be set using the Dirty tracking mechanism described above.
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
+``wakeup_vcpus_on_cpu_lock``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
:Type: spinlock_t
:Arch: x86
-:Protects: blocked_vcpu_on_cpu
+:Protects: wakeup_vcpus_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