diff options
| author | Paul Mackerras <paulus@ozlabs.org> | 2018-09-21 20:02:01 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-10-09 16:14:47 +1100 |
| commit | aa069a996951f3e2e38437ef0316685a5893fc7e (patch) | |
| tree | 40de54d39eeb75cb318b221a3d497a032ca72ab4 /arch/powerpc/kvm/powerpc.c | |
| parent | 9d67121a4fce20e0f7f127d40cd824fbbf5297dc (diff) | |
KVM: PPC: Book3S HV: Add a VM capability to enable nested virtualization
With this, userspace can enable a KVM-HV guest to run nested guests
under it.
The administrator can control whether any nested guests can be run;
setting the "nested" module parameter to false prevents any guests
becoming nested hypervisors (that is, any attempt to enable the nested
capability on a guest will fail). Guests which are already nested
hypervisors will continue to be so.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/kvm/powerpc.c')
| -rw-r--r-- | arch/powerpc/kvm/powerpc.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c index 1f4b128894a0..2869a299c4ed 100644 --- a/arch/powerpc/kvm/powerpc.c +++ b/arch/powerpc/kvm/powerpc.c @@ -597,6 +597,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) r = !!(hv_enabled && cpu_has_feature(CPU_FTR_ARCH_300) && cpu_has_feature(CPU_FTR_HVMODE)); break; + case KVM_CAP_PPC_NESTED_HV: + r = !!(hv_enabled && kvmppc_hv_ops->enable_nested && + !kvmppc_hv_ops->enable_nested(NULL)); + break; #endif case KVM_CAP_SYNC_MMU: #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE @@ -2115,6 +2119,14 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, r = kvm->arch.kvm_ops->set_smt_mode(kvm, mode, flags); break; } + + case KVM_CAP_PPC_NESTED_HV: + r = -EINVAL; + if (!is_kvmppc_hv_enabled(kvm) || + !kvm->arch.kvm_ops->enable_nested) + break; + r = kvm->arch.kvm_ops->enable_nested(kvm); + break; #endif default: r = -EINVAL; |