hw/xen: Add xen_xenstore device for xenstore emulation

Just the basic shell, with the event channel hookup. It only dumps the
buffer for now; a real ring implmentation will come in a subsequent patch.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index d2c88ef0d9..50965b56f3 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -27,6 +27,7 @@
 #include "hw/i386/kvm/xen_overlay.h"
 #include "hw/i386/kvm/xen_evtchn.h"
 #include "hw/i386/kvm/xen_gnttab.h"
+#include "hw/i386/kvm/xen_xenstore.h"
 
 #include "hw/xen/interface/version.h"
 #include "hw/xen/interface/sched.h"
@@ -179,6 +180,9 @@ int kvm_xen_init(KVMState *s, uint32_t hypercall_msr)
         return ret;
     }
 
+    /* The page couldn't be overlaid until KVM was initialized */
+    xen_xenstore_reset();
+
     return 0;
 }
 
@@ -789,6 +793,9 @@ static bool handle_get_param(struct kvm_xen_exit *exit, X86CPU *cpu,
     case HVM_PARAM_STORE_PFN:
         hp.value = XEN_SPECIAL_PFN(XENSTORE);
         break;
+    case HVM_PARAM_STORE_EVTCHN:
+        hp.value = xen_xenstore_get_port();
+        break;
     default:
         return false;
     }
@@ -1383,6 +1390,11 @@ int kvm_xen_soft_reset(void)
         return err;
     }
 
+    err = xen_xenstore_reset();
+    if (err) {
+        return err;
+    }
+
     return 0;
 }