hw/xen: Implement EVTCHNOP_send
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
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@ -490,6 +490,133 @@ static int unmask_port(XenEvtchnState *s, evtchn_port_t port, bool do_unmask)
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}
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}
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static int do_set_port_lm(XenEvtchnState *s, evtchn_port_t port,
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struct shared_info *shinfo,
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struct vcpu_info *vcpu_info)
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{
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const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]);
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typeof(shinfo->evtchn_pending[0]) mask;
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int idx = port / bits_per_word;
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int offset = port % bits_per_word;
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mask = 1UL << offset;
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if (idx >= bits_per_word) {
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return -EINVAL;
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}
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/* Update the pending bit itself. If it was already set, we're done. */
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if (qatomic_fetch_or(&shinfo->evtchn_pending[idx], mask) & mask) {
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return 0;
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}
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/* Check if it's masked. */
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if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) {
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return 0;
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}
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/* Now on to the vcpu_info evtchn_pending_sel index... */
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mask = 1UL << idx;
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/* If a port in this word was already pending for this vCPU, all done. */
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if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) {
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return 0;
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}
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/* Set evtchn_upcall_pending for this vCPU */
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if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) {
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return 0;
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}
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inject_callback(s, s->port_table[port].vcpu);
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return 0;
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}
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static int do_set_port_compat(XenEvtchnState *s, evtchn_port_t port,
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struct compat_shared_info *shinfo,
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struct compat_vcpu_info *vcpu_info)
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{
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const int bits_per_word = BITS_PER_BYTE * sizeof(shinfo->evtchn_pending[0]);
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typeof(shinfo->evtchn_pending[0]) mask;
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int idx = port / bits_per_word;
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int offset = port % bits_per_word;
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mask = 1UL << offset;
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if (idx >= bits_per_word) {
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return -EINVAL;
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}
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/* Update the pending bit itself. If it was already set, we're done. */
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if (qatomic_fetch_or(&shinfo->evtchn_pending[idx], mask) & mask) {
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return 0;
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}
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/* Check if it's masked. */
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if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) {
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return 0;
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}
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/* Now on to the vcpu_info evtchn_pending_sel index... */
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mask = 1UL << idx;
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/* If a port in this word was already pending for this vCPU, all done. */
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if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) {
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return 0;
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}
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/* Set evtchn_upcall_pending for this vCPU */
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if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) {
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return 0;
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}
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inject_callback(s, s->port_table[port].vcpu);
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return 0;
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}
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static int set_port_pending(XenEvtchnState *s, evtchn_port_t port)
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{
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void *vcpu_info, *shinfo;
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if (s->port_table[port].type == EVTCHNSTAT_closed) {
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return -EINVAL;
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}
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if (s->evtchn_in_kernel) {
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XenEvtchnPort *p = &s->port_table[port];
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CPUState *cpu = qemu_get_cpu(p->vcpu);
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struct kvm_irq_routing_xen_evtchn evt;
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if (!cpu) {
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return 0;
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}
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evt.port = port;
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evt.vcpu = kvm_arch_vcpu_id(cpu);
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evt.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
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return kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_EVTCHN_SEND, &evt);
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}
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shinfo = xen_overlay_get_shinfo_ptr();
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if (!shinfo) {
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return -ENOTSUP;
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}
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vcpu_info = kvm_xen_get_vcpu_info_hva(s->port_table[port].vcpu);
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if (!vcpu_info) {
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return -EINVAL;
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}
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if (xen_is_long_mode()) {
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return do_set_port_lm(s, port, shinfo, vcpu_info);
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} else {
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return do_set_port_compat(s, port, shinfo, vcpu_info);
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}
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}
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static int clear_port_pending(XenEvtchnState *s, evtchn_port_t port)
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{
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void *p = xen_overlay_get_shinfo_ptr();
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@ -709,3 +836,56 @@ 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_send_op(struct evtchn_send *send)
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{
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XenEvtchnState *s = xen_evtchn_singleton;
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XenEvtchnPort *p;
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int ret = 0;
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if (!s) {
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return -ENOTSUP;
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}
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if (!valid_port(send->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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p = &s->port_table[send->port];
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switch (p->type) {
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case EVTCHNSTAT_interdomain:
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if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
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/*
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* This is an event from the guest to qemu itself, which is
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* serving as the driver domain. Not yet implemented; it will
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* be hooked up to the qemu implementation of xenstore,
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* console, PV net/block drivers etc.
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*/
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ret = -ENOSYS;
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} else {
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/* Loopback interdomain ports; just a complex IPI */
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set_port_pending(s, p->type_val);
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}
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break;
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case EVTCHNSTAT_ipi:
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set_port_pending(s, send->port);
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break;
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case EVTCHNSTAT_unbound:
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/* Xen will silently drop these */
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break;
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default:
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ret = -EINVAL;
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break;
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}
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qemu_mutex_unlock(&s->port_lock);
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return ret;
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}
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@ -20,10 +20,12 @@ struct evtchn_close;
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struct evtchn_unmask;
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struct evtchn_bind_virq;
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struct evtchn_bind_ipi;
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struct evtchn_send;
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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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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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#endif /* QEMU_XEN_EVTCHN_H */
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@ -909,6 +909,18 @@ 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_send: {
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struct evtchn_send send;
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qemu_build_assert(sizeof(send) == 4);
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if (kvm_copy_from_gva(cs, arg, &send, sizeof(send))) {
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err = -EFAULT;
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break;
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}
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err = xen_evtchn_send_op(&send);
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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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