From b599d44a71f1aa1acff54b05e4c0e60ea82ed90c Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Thu, 22 May 2025 16:52:20 -0700 Subject: [PATCH] KVM: Drop sanity check that per-VM list of irqfds is unique Now that the eventfd's waitqueue ensures it has at most one priority waiter, i.e. prevents KVM from binding multiple irqfds to one eventfd, drop KVM's sanity check that eventfds are unique for a single VM. Tested-by: K Prateek Nayak Acked-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20250522235223.3178519-11-seanjc@google.com Signed-off-by: Sean Christopherson --- virt/kvm/eventfd.c | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index ab9e3cfb81bf..6b1133a6617f 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -288,7 +288,6 @@ static void kvm_irqfd_register(struct file *file, wait_queue_head_t *wqh, { struct kvm_irqfd_pt *p = container_of(pt, struct kvm_irqfd_pt, pt); struct kvm_kernel_irqfd *irqfd = p->irqfd; - struct kvm_kernel_irqfd *tmp; struct kvm *kvm = p->kvm; /* @@ -328,16 +327,6 @@ static void kvm_irqfd_register(struct file *file, wait_queue_head_t *wqh, if (p->ret) goto out; - list_for_each_entry(tmp, &kvm->irqfds.items, list) { - if (irqfd->eventfd != tmp->eventfd) - continue; - - WARN_ON_ONCE(1); - /* This fd is used for another irq already. */ - p->ret = -EBUSY; - goto out; - } - list_add_tail(&irqfd->list, &kvm->irqfds.items); out: -- 2.47.2