[PATCH v8 23/58] i386/xen: implement HYPERVISOR_event_channel_op

[David Woodhouse <dwmw2@infradead.org>]

From: Joao Martins <joao.m.martins@oracle.com>

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Ditch event_channel_op_compat which was never available to HVM guests]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
---
 target/i386/kvm/xen-emu.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 8450b162ad..7ef3d8e520 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -28,6 +28,7 @@
 #include "standard-headers/xen/memory.h"
 #include "standard-headers/xen/hvm/hvm_op.h"
 #include "standard-headers/xen/vcpu.h"
+#include "standard-headers/xen/event_channel.h"
 
 #include "xen-compat.h"
 
@@ -588,6 +589,27 @@ static bool kvm_xen_hcall_vcpu_op(struct kvm_xen_exit *exit, X86CPU *cpu,
     return true;
 }
 
+static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit,
+                                    int cmd, uint64_t arg)
+{
+    int err = -ENOSYS;
+
+    switch (cmd) {
+    case EVTCHNOP_init_control:
+    case EVTCHNOP_expand_array:
+    case EVTCHNOP_set_priority:
+        /* We do not support FIFO channels at this point */
+        err = -ENOSYS;
+        break;
+
+    default:
+        return false;
+    }
+
+    exit->u.hcall.result = err;
+    return true;
+}
+
 int kvm_xen_soft_reset(void)
 {
     CPUState *cpu;
@@ -694,6 +716,9 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
     case __HYPERVISOR_sched_op:
         return kvm_xen_hcall_sched_op(exit, cpu, exit->u.hcall.params[0],
                                       exit->u.hcall.params[1]);
+    case __HYPERVISOR_event_channel_op:
+        return kvm_xen_hcall_evtchn_op(exit, exit->u.hcall.params[0],
+                                       exit->u.hcall.params[1]);
     case __HYPERVISOR_vcpu_op:
         return kvm_xen_hcall_vcpu_op(exit, cpu,
                                      exit->u.hcall.params[0],
-- 
2.39.0