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KVM: PPC: Book3S HV: Add a VM capability to enable nested virtualization

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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>
This commit is contained in:
Paul Mackerras
2018-09-21 20:02:01 +10:00
parent 9d67121a4f
commit aa069a9969
5 changed files with 58 additions and 9 deletions
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include/uapi/linux/kvm.h
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@@ -953,6 +953,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_NESTED_STATE 157
#define KVM_CAP_ARM_INJECT_SERROR_ESR 158
#define KVM_CAP_MSR_PLATFORM_INFO 159
#define KVM_CAP_PPC_NESTED_HV 160
#ifdef KVM_CAP_IRQ_ROUTING