S390: Tell user why VM creation failed
The KVM kernel module on S390 refuses to create a VM when the switch_amode
kernel parameter is not used.
Since that is not exactly obvious, let's give the user a nice warning.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/kvm-all.c b/kvm-all.c
index 6324635..7aa5e57 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -607,8 +607,13 @@
}
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);
- if (s->vmfd < 0)
+ if (s->vmfd < 0) {
+#ifdef TARGET_S390X
+ fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "
+ "your host kernel command line\n");
+#endif
goto err;
+ }
/* initially, KVM allocated its own memory and we had to jump through
* hooks to make phys_ram_base point to this. Modern versions of KVM
