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SubjectRe: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal()
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

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.


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