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Documentation: kvm: fixes for locking.rst

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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>
This commit is contained in:
Paolo Bonzini 2022-03-22 12:07:19 +01:00
parent 07ea4ab1f9
commit e9611bf9d2
1 changed files with 19 additions and 9 deletions
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28
Documentation/virt/kvm/locking.rst
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@ -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