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authorDavid Woodhouse <dwmw@amazon.co.uk>2022-12-14 17:26:32 +0000
committerDavid Woodhouse <dwmw@amazon.co.uk>2023-03-01 08:22:50 +0000
commit8432788104b6b4843738edbc5cf084b2a3687ee9 (patch)
tree260b600250efb1baca80097c9eed8b7ae79409d3 /hw/i386/kvm
parente1db61b87b0e479bcacdf0c17656c8ee563cc5ba (diff)
hw/xen: Implement EVTCHNOP_bind_interdomain
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
Diffstat (limited to 'hw/i386/kvm')
-rw-r--r--hw/i386/kvm/xen_evtchn.c78
-rw-r--r--hw/i386/kvm/xen_evtchn.h2
2 files changed, 80 insertions, 0 deletions
diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index df25bf0806..e2e36d94f6 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -722,6 +722,23 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port)
}
break;
+ case EVTCHNSTAT_interdomain:
+ if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
+ /* Not yet implemented. This can't happen! */
+ } else {
+ /* Loopback interdomain */
+ XenEvtchnPort *rp = &s->port_table[p->type_val];
+ if (!valid_port(p->type_val) || rp->type_val != port ||
+ rp->type != EVTCHNSTAT_interdomain) {
+ error_report("Inconsistent state for interdomain unbind");
+ } else {
+ /* Set the other end back to unbound */
+ rp->type = EVTCHNSTAT_unbound;
+ rp->type_val = 0;
+ }
+ }
+ break;
+
default:
break;
}
@@ -837,6 +854,67 @@ int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
return ret;
}
+int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
+{
+ XenEvtchnState *s = xen_evtchn_singleton;
+ uint16_t type_val;
+ int ret;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ if (interdomain->remote_dom == DOMID_QEMU) {
+ type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
+ } else if (interdomain->remote_dom == DOMID_SELF ||
+ interdomain->remote_dom == xen_domid) {
+ type_val = 0;
+ } else {
+ return -ESRCH;
+ }
+
+ if (!valid_port(interdomain->remote_port)) {
+ return -EINVAL;
+ }
+
+ qemu_mutex_lock(&s->port_lock);
+
+ /* The newly allocated port starts out as unbound */
+ ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val,
+ &interdomain->local_port);
+ if (ret) {
+ goto out;
+ }
+
+ if (interdomain->remote_dom == DOMID_QEMU) {
+ /* We haven't hooked up QEMU's PV drivers to this yet */
+ ret = -ENOSYS;
+ } else {
+ /* Loopback */
+ XenEvtchnPort *rp = &s->port_table[interdomain->remote_port];
+ XenEvtchnPort *lp = &s->port_table[interdomain->local_port];
+
+ if (rp->type == EVTCHNSTAT_unbound && rp->type_val == 0) {
+ /* It's a match! */
+ rp->type = EVTCHNSTAT_interdomain;
+ rp->type_val = interdomain->local_port;
+
+ lp->type = EVTCHNSTAT_interdomain;
+ lp->type_val = interdomain->remote_port;
+ } else {
+ ret = -EINVAL;
+ }
+ }
+
+ if (ret) {
+ free_port(s, interdomain->local_port);
+ }
+ out:
+ qemu_mutex_unlock(&s->port_lock);
+
+ return ret;
+
+}
int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
{
XenEvtchnState *s = xen_evtchn_singleton;
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index fc080138e3..1ebc7580eb 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -22,6 +22,7 @@ struct evtchn_bind_virq;
struct evtchn_bind_ipi;
struct evtchn_send;
struct evtchn_alloc_unbound;
+struct evtchn_bind_interdomain;
int xen_evtchn_status_op(struct evtchn_status *status);
int xen_evtchn_close_op(struct evtchn_close *close);
int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
@@ -29,5 +30,6 @@ int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq);
int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi);
int xen_evtchn_send_op(struct evtchn_send *send);
int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
+int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain);
#endif /* QEMU_XEN_EVTCHN_H */