[Xen-devel] [PATCH] shut down domain when last vCPU goes down

["Jan Beulich" <JBeulich@xxxxxxxx>]

I've just had to deal with an early boot crash of Linux which occurred
so early that even "earlyprintk=xen" did not produce any useful output.
Hence the domain appeared to hang, while in fact it had brought down its
only vCPU. By translating this to a shutdown, the situation will be
better recognizable.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -1321,6 +1321,22 @@ long do_vcpu_op(int cmd, unsigned int vc
         break;
 
     case VCPUOP_down:
+        for_each_vcpu ( d, v )
+            if ( v->vcpu_id != vcpuid && !test_bit(_VPF_down, &v->pause_flags) 
)
+            {
+               rc = 1;
+               break;
+            }
+
+        if ( !rc )
+        {
+            domain_shutdown(d, SHUTDOWN_poweroff);
+            break;
+        }
+
+        rc = 0;
+        v = d->vcpu[vcpuid];
+
 #ifdef CONFIG_X86
         if ( pv_shim )
             rc = continue_hypercall_on_cpu(0, pv_shim_cpu_down, v);




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