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 <kprateek.nayak@amd.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250522235223.3178519-11-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index ab9e3cfb81bfd894e0cbb97734222cb89922f124..6b1133a6617f569728b225ea27d3fa93d13d640e 100644 (file)
--- 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: