diff options
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 31cf22f7d846..03eeeb0ded24 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -125,6 +125,11 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { { NULL } }; +/* allow nested virtualization in KVM (if enabled by user space) */ +static int nested; +module_param(nested, int, S_IRUGO); +MODULE_PARM_DESC(nested, "Nested virtualization support"); + /* upper facilities limit for kvm */ unsigned long kvm_s390_fac_list_mask[16] = { 0xffe6000000000000UL, @@ -264,7 +269,7 @@ static void kvm_s390_cpu_feat_init(void) * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). */ if (!sclp.has_sief2 || !MACHINE_HAS_ESOP || !sclp.has_64bscao || - !test_facility(3)) + !test_facility(3) || !nested) return; allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); if (sclp.has_64bscao) |