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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH 2/2] Documentation: kvm: include new locks
Date: Tue, 22 Mar 2022 12:07:20 +0100	[thread overview]
Message-ID: <20220322110720.222499-3-pbonzini@redhat.com> (raw)
In-Reply-To: <20220322110720.222499-1-pbonzini@redhat.com>

kvm->mn_invalidate_lock and kvm->slots_arch_lock were not included in the
documentation, add them.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Documentation/virt/kvm/locking.rst | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Documentation/virt/kvm/locking.rst b/Documentation/virt/kvm/locking.rst
index 4f21063bfbd6..486efcd36fd6 100644
--- a/Documentation/virt/kvm/locking.rst
+++ b/Documentation/virt/kvm/locking.rst
@@ -226,6 +226,12 @@ time it will be set using the Dirty tracking mechanism described above.
 :Comment:	'raw' because hardware enabling/disabling must be atomic /wrt
 		migration.
 
+``kvm->mn_invalidate_lock``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+:Type:          spinlock_t
+:Arch:          any
+:Protects:      mn_active_invalidate_count, mn_memslots_update_rcuwait
 
 ``kvm_arch::tsc_write_lock``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -255,6 +261,15 @@ 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.
 
+``kvm->slots_arch_lock``
+^^^^^^^^^^^^^^^^^^^^^^^^
+:Type:          mutex
+:Arch:          any (only needed on x86 though)
+:Protects:      any arch-specific fields of memslots that have to be modified
+                in a ``kvm->srcu`` read-side critical section.
+:Comment:       must be held before reading the pointer to the current memslots,
+                until after all changes to the memslots are complete
+
 ``wakeup_vcpus_on_cpu_lock``
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 :Type:		spinlock_t
-- 
2.35.1


      parent reply	other threads:[~2022-03-22 11:07 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-22 11:07 [PATCH 0/2] Documentation: kvm: improvements to locking.rst Paolo Bonzini
2022-03-22 11:07 ` [PATCH 1/2] Documentation: kvm: fixes for locking.rst Paolo Bonzini
2022-03-22 11:07 ` Paolo Bonzini [this message]

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