diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2022-12-26 12:03:17 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-12-27 06:01:49 -0500 |
| commit | 70eae03087a3101493d9a1cf60c86c5f65600822 (patch) | |
| tree | a980cfdcdcb5f4ac71a99f9a932a1fad80117f3c /scripts/jobserver-exec | |
| parent | 92c58965e9656dc6e682a8ffe520fac0fb256d13 (diff) | |
KVM: x86/xen: Fix SRCU/RCU usage in readers of evtchn_ports
The evtchnfd structure itself must be protected by either kvm->lock or
SRCU. Use the former in kvm_xen_eventfd_update(), since the lock is
being taken anyway; kvm_xen_hcall_evtchn_send() instead is a reader and
does not need kvm->lock, and is called in SRCU critical section from the
kvm_x86_handle_exit function.
It is also important to use rcu_read_{lock,unlock}() in
kvm_xen_hcall_evtchn_send(), because idr_remove() will *not*
use synchronize_srcu() to wait for readers to complete.
Remove a superfluous if (kvm) check before calling synchronize_srcu()
in kvm_xen_eventfd_deassign() where kvm has been dereferenced already.
Co-developed-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20221226120320.1125390-3-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'scripts/jobserver-exec')
0 files changed, 0 insertions, 0 deletions