KVM: avoid using rcu_dereference_protected

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During teardown, accesses to memslots and buses are using
rcu_dereference_protected with an always-true condition because
these accesses are done outside the usual mutexes.  This
is because the last reference is gone and there cannot be any
concurrent modifications, but rcu_dereference_protected is
ugly and unobvious.

Instead, check the refcount in kvm_get_bus and __kvm_memslots.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

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Paolo Bonzini 2017-08-02 17:55:54 +02:00 • committed by Radim Krčmář

parent ebd28fcb55

commit 3898da947b

2 changed files with 8 additions and 9 deletions

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6

include/linux/kvm_host.h

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11

virt/kvm/kvm_main.c

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