hw/xen: Implement EVTCHNOP_bind_interdomain
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
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8432788104
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@ -722,6 +722,23 @@ static int close_port(XenEvtchnState *s, evtchn_port_t port)
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}
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break;
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case EVTCHNSTAT_interdomain:
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if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
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/* Not yet implemented. This can't happen! */
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} else {
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/* Loopback interdomain */
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XenEvtchnPort *rp = &s->port_table[p->type_val];
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if (!valid_port(p->type_val) || rp->type_val != port ||
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rp->type != EVTCHNSTAT_interdomain) {
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error_report("Inconsistent state for interdomain unbind");
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} else {
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/* Set the other end back to unbound */
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rp->type = EVTCHNSTAT_unbound;
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rp->type_val = 0;
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}
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}
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break;
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default:
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break;
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}
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@ -837,6 +854,67 @@ int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
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return ret;
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}
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int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain)
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{
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XenEvtchnState *s = xen_evtchn_singleton;
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uint16_t type_val;
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int ret;
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if (!s) {
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return -ENOTSUP;
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}
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if (interdomain->remote_dom == DOMID_QEMU) {
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type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
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} else if (interdomain->remote_dom == DOMID_SELF ||
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interdomain->remote_dom == xen_domid) {
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type_val = 0;
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} else {
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return -ESRCH;
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}
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if (!valid_port(interdomain->remote_port)) {
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return -EINVAL;
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}
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qemu_mutex_lock(&s->port_lock);
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/* The newly allocated port starts out as unbound */
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ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val,
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&interdomain->local_port);
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if (ret) {
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goto out;
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}
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if (interdomain->remote_dom == DOMID_QEMU) {
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/* We haven't hooked up QEMU's PV drivers to this yet */
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ret = -ENOSYS;
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} else {
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/* Loopback */
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XenEvtchnPort *rp = &s->port_table[interdomain->remote_port];
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XenEvtchnPort *lp = &s->port_table[interdomain->local_port];
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if (rp->type == EVTCHNSTAT_unbound && rp->type_val == 0) {
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/* It's a match! */
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rp->type = EVTCHNSTAT_interdomain;
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rp->type_val = interdomain->local_port;
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lp->type = EVTCHNSTAT_interdomain;
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lp->type_val = interdomain->remote_port;
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} else {
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ret = -EINVAL;
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}
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}
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if (ret) {
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free_port(s, interdomain->local_port);
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}
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out:
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qemu_mutex_unlock(&s->port_lock);
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return ret;
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}
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int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
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{
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XenEvtchnState *s = xen_evtchn_singleton;
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@ -22,6 +22,7 @@ struct evtchn_bind_virq;
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struct evtchn_bind_ipi;
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struct evtchn_send;
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struct evtchn_alloc_unbound;
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struct evtchn_bind_interdomain;
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int xen_evtchn_status_op(struct evtchn_status *status);
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int xen_evtchn_close_op(struct evtchn_close *close);
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int xen_evtchn_unmask_op(struct evtchn_unmask *unmask);
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@ -29,5 +30,6 @@ int xen_evtchn_bind_virq_op(struct evtchn_bind_virq *virq);
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int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi);
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int xen_evtchn_send_op(struct evtchn_send *send);
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int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
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int xen_evtchn_bind_interdomain_op(struct evtchn_bind_interdomain *interdomain);
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#endif /* QEMU_XEN_EVTCHN_H */
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@ -936,6 +936,22 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
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}
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break;
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}
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case EVTCHNOP_bind_interdomain: {
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struct evtchn_bind_interdomain interdomain;
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qemu_build_assert(sizeof(interdomain) == 12);
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if (kvm_copy_from_gva(cs, arg, &interdomain, sizeof(interdomain))) {
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err = -EFAULT;
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break;
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}
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err = xen_evtchn_bind_interdomain_op(&interdomain);
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if (!err &&
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kvm_copy_to_gva(cs, arg, &interdomain, sizeof(interdomain))) {
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err = -EFAULT;
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}
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break;
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}
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default:
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return false;
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}
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