From: David Woodhouse <d...@amazon.co.uk>
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
Reviewed-by: Paul Durrant <p...@xen.org>
---
hw/i386/kvm/xen_evtchn.c | 180 ++++++++++++++++++++++++++++++++++++++
hw/i386/kvm/xen_evtchn.h | 2 +
target/i386/kvm/xen-emu.c | 12 +++
3 files changed, 194 insertions(+)
diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index d8527483b9..a97d6ba61d 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -490,6 +490,133 @@ static int unmask_port(XenEvtchnState *s, evtchn_port_t
port, bool do_unmask)
}
}
+static int do_set_port_lm(XenEvtchnState *s, evtchn_port_t port,
+ struct shared_info *shinfo,
+ struct vcpu_info *vcpu_info)
+{
+ const int bits_per_word = BITS_PER_BYTE *
sizeof(shinfo->evtchn_pending[0]);
+ typeof(shinfo->evtchn_pending[0]) mask;
+ int idx = port / bits_per_word;
+ int offset = port % bits_per_word;
+
+ mask = 1UL << offset;
+
+ if (idx >= bits_per_word) {
+ return -EINVAL;
+ }
+
+ /* Update the pending bit itself. If it was already set, we're done. */
+ if (qatomic_fetch_or(&shinfo->evtchn_pending[idx], mask) & mask) {
+ return 0;
+ }
+
+ /* Check if it's masked. */
+ if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) {
+ return 0;
+ }
+
+ /* Now on to the vcpu_info evtchn_pending_sel index... */
+ mask = 1UL << idx;
+
+ /* If a port in this word was already pending for this vCPU, all done. */
+ if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) {
+ return 0;
+ }
+
+ /* Set evtchn_upcall_pending for this vCPU */
+ if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) {
+ return 0;
+ }
+
+ inject_callback(s, s->port_table[port].vcpu);
+
+ return 0;
+}
+
+static int do_set_port_compat(XenEvtchnState *s, evtchn_port_t port,
+ struct compat_shared_info *shinfo,
+ struct compat_vcpu_info *vcpu_info)
+{
+ const int bits_per_word = BITS_PER_BYTE *
sizeof(shinfo->evtchn_pending[0]);
+ typeof(shinfo->evtchn_pending[0]) mask;
+ int idx = port / bits_per_word;
+ int offset = port % bits_per_word;
+
+ mask = 1UL << offset;
+
+ if (idx >= bits_per_word) {
+ return -EINVAL;
+ }
+
+ /* Update the pending bit itself. If it was already set, we're done. */
+ if (qatomic_fetch_or(&shinfo->evtchn_pending[idx], mask) & mask) {
+ return 0;
+ }
+
+ /* Check if it's masked. */
+ if (qatomic_fetch_or(&shinfo->evtchn_mask[idx], 0) & mask) {
+ return 0;
+ }
+
+ /* Now on to the vcpu_info evtchn_pending_sel index... */
+ mask = 1UL << idx;
+
+ /* If a port in this word was already pending for this vCPU, all done. */
+ if (qatomic_fetch_or(&vcpu_info->evtchn_pending_sel, mask) & mask) {
+ return 0;
+ }
+
+ /* Set evtchn_upcall_pending for this vCPU */
+ if (qatomic_fetch_or(&vcpu_info->evtchn_upcall_pending, 1)) {
+ return 0;
+ }
+
+ inject_callback(s, s->port_table[port].vcpu);
+
+ return 0;
+}
+
+static int set_port_pending(XenEvtchnState *s, evtchn_port_t port)
+{
+ void *vcpu_info, *shinfo;
+
+ if (s->port_table[port].type == EVTCHNSTAT_closed) {
+ return -EINVAL;
+ }
+
+ if (s->evtchn_in_kernel) {
+ XenEvtchnPort *p = &s->port_table[port];
+ CPUState *cpu = qemu_get_cpu(p->vcpu);
+ struct kvm_irq_routing_xen_evtchn evt;
+
+ if (!cpu) {
+ return 0;
+ }
+
+ evt.port = port;
+ evt.vcpu = kvm_arch_vcpu_id(cpu);
+ evt.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
+
+ return kvm_vm_ioctl(kvm_state, KVM_XEN_HVM_EVTCHN_SEND, &evt);
+ }
+
+ shinfo = xen_overlay_get_shinfo_ptr();
+ if (!shinfo) {
+ return -ENOTSUP;
+ }
+
+ vcpu_info = kvm_xen_get_vcpu_info_hva(s->port_table[port].vcpu);
+ if (!vcpu_info) {
+ return -EINVAL;
+ }
+
+ if (xen_is_long_mode()) {
+ return do_set_port_lm(s, port, shinfo, vcpu_info);
+ } else {
+ return do_set_port_compat(s, port, shinfo, vcpu_info);
+ }
+}
+
static int clear_port_pending(XenEvtchnState *s, evtchn_port_t port)
{
void *p = xen_overlay_get_shinfo_ptr();
@@ -707,3 +834,56 @@ int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
return ret;
}
+
+int xen_evtchn_send_op(struct evtchn_send *send)
+{
+ XenEvtchnState *s = xen_evtchn_singleton;
+ XenEvtchnPort *p;
+ int ret = 0;
+
+ if (!s) {
+ return -ENOTSUP;
+ }
+
+ if (!valid_port(send->port)) {
+ return -EINVAL;
+ }
+
+ qemu_mutex_lock(&s->port_lock);
+
+ p = &s->port_table[send->port];
+
+ switch (p->type) {
+ case EVTCHNSTAT_interdomain:
+ if (p->type_val & PORT_INFO_TYPEVAL_REMOTE_QEMU) {
+ /*
+ * This is an event from the guest to qemu itself, which is
+ * serving as the driver domain. Not yet implemented; it will
+ * be hooked up to the qemu implementation of xenstore,
+ * console, PV net/block drivers etc.
+ */
+ ret = -ENOSYS;
+ } else {
+ /* Loopback interdomain ports; just a complex IPI */
+ set_port_pending(s, p->type_val);
+ }
+ break;
+
+ case EVTCHNSTAT_ipi:
+ set_port_pending(s, send->port);
+ break;
+
+ case EVTCHNSTAT_unbound:
+ /* Xen will silently drop these */
+ break;
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ qemu_mutex_unlock(&s->port_lock);
+
+ return ret;
+}
+
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index 107f420848..500fdbe8b8 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -20,10 +20,12 @@ struct evtchn_close;
struct evtchn_unmask;
struct evtchn_bind_virq;
struct evtchn_bind_ipi;
+struct evtchn_send;
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);
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);
#endif /* QEMU_XEN_EVTCHN_H */
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 4a20ccdf78..5299614d3c 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -906,6 +906,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit
*exit, X86CPU *cpu,
}
break;
}
+ case EVTCHNOP_send: {
+ struct evtchn_send send;
+
+ qemu_build_assert(sizeof(send) == 4);
+ if (kvm_copy_from_gva(cs, arg, &send, sizeof(send))) {
+ err = -EFAULT;
+ break;
+ }
+
+ err = xen_evtchn_send_op(&send);
+ break;
+ }
default:
return false;
}
--
2.39.0
