xics/kvm: Add proper rollback to xics_kvm_init()

Make xics_kvm_disconnect() able to undo the changes of a partial execution
of xics_kvm_connect() and use it to perform rollback.

Note that kvmppc_define_rtas_kernel_token(0) never fails, no matter the
RTAS call has been defined or not.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <156077922319.433243.609897156640506891.stgit@bahia.lan>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index 4bfbe1a..51433b1 100644 (file)
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -421,10 +421,7 @@ int xics_kvm_connect(SpaprMachineState *spapr, Error **errp)
 
 fail:
     error_propagate(errp, local_err);
-    kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
-    kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");
-    kvmppc_define_rtas_kernel_token(0, "ibm,int-on");
-    kvmppc_define_rtas_kernel_token(0, "ibm,int-off");
+    xics_kvm_disconnect(spapr, NULL);
     return -1;
 }
 
@@ -448,8 +445,10 @@ void xics_kvm_disconnect(SpaprMachineState *spapr, Error **errp)
      * removed from the list of devices of the VM. The VCPU presenters
      * are also detached from the device.
      */
-    close(kernel_xics_fd);
-    kernel_xics_fd = -1;
+    if (kernel_xics_fd != -1) {
+        close(kernel_xics_fd);
+        kernel_xics_fd = -1;
+    }
 
     kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
     kvmppc_define_rtas_kernel_token(0, "ibm,get-xive");