From 306670461bb19e7af42b3d68d007d7690efd2334 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw@amazon.co.uk>
Date: Wed, 14 Dec 2022 19:27:38 +0000
Subject: hw/xen: Implement EVTCHNOP_bind_vcpu

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
---
 hw/i386/kvm/xen_evtchn.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'hw/i386/kvm/xen_evtchn.c')

diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index e2e36d94f6..cbaf4f535a 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -791,6 +791,46 @@ int xen_evtchn_unmask_op(struct evtchn_unmask *unmask)
     return ret;
 }
 
+int xen_evtchn_bind_vcpu_op(struct evtchn_bind_vcpu *vcpu)
+{
+    XenEvtchnState *s = xen_evtchn_singleton;
+    XenEvtchnPort *p;
+    int ret = -EINVAL;
+
+    if (!s) {
+        return -ENOTSUP;
+    }
+
+    if (!valid_port(vcpu->port)) {
+        return -EINVAL;
+    }
+
+    if (!valid_vcpu(vcpu->vcpu)) {
+        return -ENOENT;
+    }
+
+    qemu_mutex_lock(&s->port_lock);
+
+    p = &s->port_table[vcpu->port];
+
+    if (p->type == EVTCHNSTAT_interdomain ||
+        p->type == EVTCHNSTAT_unbound ||
+        p->type == EVTCHNSTAT_pirq ||
+        (p->type == EVTCHNSTAT_virq && virq_is_global(p->type_val))) {
+        /*
+         * unmask_port() with do_unmask==false will just raise the event
+         * on the new vCPU if the port was already pending.
+         */
+        p->vcpu = vcpu->vcpu;
+        unmask_port(s, vcpu->port, false);
+        ret = 0;
+    }
+
+    qemu_mutex_unlock(&s->port_lock);
+
+    return ret;
+}
+
 int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq)
 {
     XenEvtchnState *s = xen_evtchn_singleton;
-- 
cgit v1.2.3