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author | Dmytro Maluka <dmy@semihalf.com> | 2023-03-22 23:43:43 +0300 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-03-27 17:13:28 +0300 |
commit | d583fbd7066a2dea43050521a95d9770f7d7593e (patch) | |
tree | 4ced8cc1d8e18a2af60394d1f9bd7274e9d4d2c3 /ipc/mq_sysctl.c | |
parent | e5c972c1fadacc858b6a564d056f177275238040 (diff) | |
download | linux-d583fbd7066a2dea43050521a95d9770f7d7593e.tar.xz |
KVM: irqfd: Make resampler_list an RCU list
It is useful to be able to do read-only traversal of the list of all the
registered irqfd resamplers without locking the resampler_lock mutex.
In particular, we are going to traverse it to search for a resampler
registered for the given irq of an irqchip, and that will be done with
an irqchip spinlock (ioapic->lock) held, so it is undesirable to lock a
mutex in this context. So turn this list into an RCU list.
For protecting the read side, reuse kvm->irq_srcu which is already used
for protecting a number of irq related things (kvm->irq_routing,
irqfd->resampler->list, kvm->irq_ack_notifier_list,
kvm->arch.mask_notifier_list).
Signed-off-by: Dmytro Maluka <dmy@semihalf.com>
Message-Id: <20230322204344.50138-2-dmy@semihalf.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'ipc/mq_sysctl.c')
0 files changed, 0 insertions, 0 deletions