1 files changed, 39 insertions, 0 deletions
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 75bcf7b..d2c88ef 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -765,6 +765,42 @@ out:
     return true;
 }
 
+static bool handle_get_param(struct kvm_xen_exit *exit, X86CPU *cpu,
+                             uint64_t arg)
+{
+    CPUState *cs = CPU(cpu);
+    struct xen_hvm_param hp;
+    int err = 0;
+
+    /* No need for 32/64 compat handling */
+    qemu_build_assert(sizeof(hp) == 16);
+
+    if (kvm_copy_from_gva(cs, arg, &hp, sizeof(hp))) {
+        err = -EFAULT;
+        goto out;
+    }
+
+    if (hp.domid != DOMID_SELF && hp.domid != xen_domid) {
+        err = -ESRCH;
+        goto out;
+    }
+
+    switch (hp.index) {
+    case HVM_PARAM_STORE_PFN:
+        hp.value = XEN_SPECIAL_PFN(XENSTORE);
+        break;
+    default:
+        return false;
+    }
+
+    if (kvm_copy_to_gva(cs, arg, &hp, sizeof(hp))) {
+        err = -EFAULT;
+    }
+out:
+    exit->u.hcall.result = err;
+    return true;
+}
+
 static int kvm_xen_hcall_evtchn_upcall_vector(struct kvm_xen_exit *exit,
                                               X86CPU *cpu, uint64_t arg)
 {
@@ -809,6 +845,9 @@ static bool kvm_xen_hcall_hvm_op(struct kvm_xen_exit *exit, X86CPU *cpu,
     case HVMOP_set_param:
         return handle_set_param(exit, cpu, arg);
 
+    case HVMOP_get_param:
+        return handle_get_param(exit, cpu, arg);
+
     default:
         return false;
     }