From 0104dcacf374cb9ceff078e9470cc0cc5bb7c8ec Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Thu, 1 Apr 2010 18:42:37 +0200 Subject: [PATCH] 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 Signed-off-by: Aurelien Jarno --- kvm-all.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kvm-all.c b/kvm-all.c index 6324635d3f..7aa5e57e88 100644 --- a/kvm-all.c +++ b/kvm-all.c @@ -607,8 +607,13 @@ int kvm_init(int smp_cpus) } 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 -- 2.39.2