jchzhou/kernel-sophgo-sg2044-revyos-6.17-src
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KVM: Drop sanity check that per-VM list of irqfds is unique

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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>
This commit is contained in:
Sean Christopherson
2025-05-22 16:52:20 -07:00
parent 2cdd64cbf9
commit b599d44a71
1 changed files with 0 additions and 11 deletions
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11
virt/kvm/eventfd.c
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@@ -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: