diff mbox series

[RFC,v3,31/38] hw/xen: Implement EVTCHNOP_alloc_unbound

Message ID 20221216004117.862106-32-dwmw2@infradead.org
State New
Headers show
Series Xen HVM support under KVM | expand

Commit Message

David Woodhouse Dec. 16, 2022, 12:41 a.m. UTC 
From: David Woodhouse <dwmw@amazon.co.uk>

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
 hw/i386/kvm/xen_evtchn.c  | 32 ++++++++++++++++++++++++++++++++
 hw/i386/kvm/xen_evtchn.h  |  2 ++
 target/i386/kvm/xen-emu.c | 15 +++++++++++++++
 3 files changed, 49 insertions(+)
diff mbox series

Patch

diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c
index d90a92a25a..4272b63853 100644
--- a/hw/i386/kvm/xen_evtchn.c
+++ b/hw/i386/kvm/xen_evtchn.c
@@ -732,6 +732,38 @@  int xen_evtchn_bind_ipi_op(struct evtchn_bind_ipi *ipi)
     return ret;
 }
 
+int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc)
+{
+    XenEvtchnState *s = xen_evtchn_singleton;
+    uint16_t type_val;
+    int ret;
+
+    if (!s) {
+        return -ENOTSUP;
+    }
+
+    if (alloc->dom != DOMID_SELF && alloc->dom != xen_domid) {
+        return -ESRCH;
+    }
+
+    if (alloc->remote_dom == DOMID_QEMU) {
+        type_val = PORT_INFO_TYPEVAL_REMOTE_QEMU;
+    } else if (alloc->remote_dom == DOMID_SELF ||
+               alloc->remote_dom == xen_domid) {
+        type_val = 0;
+    } else {
+        return -EPERM;
+    }
+
+    qemu_mutex_lock(&s->port_lock);
+
+    ret = allocate_port(s, 0, EVTCHNSTAT_unbound, type_val, &alloc->port);
+
+    qemu_mutex_unlock(&s->port_lock);
+
+    return ret;
+}
+
 int xen_evtchn_send_op(struct evtchn_send *send)
 {
     XenEvtchnState *s = xen_evtchn_singleton;
diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h
index c27b9e8096..5dc68a188d 100644
--- a/hw/i386/kvm/xen_evtchn.h
+++ b/hw/i386/kvm/xen_evtchn.h
@@ -19,9 +19,11 @@  struct evtchn_unmask;
 struct evtchn_bind_virq;
 struct evtchn_bind_ipi;
 struct evtchn_send;
+struct evtchn_alloc_unbound;
 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);
+int xen_evtchn_alloc_unbound_op(struct evtchn_alloc_unbound *alloc);
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 300b0d75bc..6f393c4149 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -812,6 +812,21 @@  static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
         err = xen_evtchn_send_op(&send);
         break;
     }
+    case EVTCHNOP_alloc_unbound: {
+        struct evtchn_alloc_unbound alloc;
+
+        qemu_build_assert(sizeof(alloc) == 8);
+        if (kvm_copy_from_gva(cs, arg, &alloc, sizeof(alloc))) {
+            err = -EFAULT;
+            break;
+        }
+
+        err = xen_evtchn_alloc_unbound_op(&alloc);
+        if (!err && kvm_copy_to_gva(cs, arg, &alloc, sizeof(alloc))) {
+            err = -EFAULT;
+        }
+        break;
+    }
     default:
         return false;
     }