Messages in this thread |  | | Subject | Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal() | From | Paolo Bonzini <> | Date | Thu, 15 Jul 2021 11:51:32 +0200 |
| |
On 15/07/21 10:44, He Zhe wrote: > It was to increase the recursion depth to 2 so that vhost_worker and > kvm_vcpu_ioctl syscall could work in parallel
The count is per-CPU, so parallel operations cannot cause it to become 2. Your patch might fix calls from ioeventfd to vhost_worker to another eventfd, but not *parallel* operation of KVM and vhost (except on PREEMPT_RT).
You should identify the exact callstack that caused the warning for vDUSE, and document that one in the commit message, so that reviewers can understand the issue.
Paolo
|  |