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S390: Tell user why VM creation failed

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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>
This commit is contained in:
Alexander Graf 2010-04-01 18:42:37 +02:00 committed by Aurelien Jarno
parent c92114b1fb
commit 0104dcacf3
1 changed files with 6 additions and 1 deletions
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7
kvm-all.c
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@ -607,8 +607,13 @@ int kvm_init(int smp_cpus)
} }
s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0); 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; goto err;
}
/* initially, KVM allocated its own memory and we had to jump through /* 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 * hooks to make phys_ram_base point to this. Modern versions of KVM