@@ -4234,6 +4234,10 @@ static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
{
struct kvm_ppc_one_seg_page_size *sps;
+ /* If we're a nested hypervisor, we only support radix guests */
+ if (kvmhv_on_pseries())
+ return -EINVAL;
+
/*
* POWER7, POWER8 and POWER9 all support 32 storage keys for data.
* POWER7 doesn't support keys for instruction accesses,
@@ -4819,11 +4823,15 @@ static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
static int kvmppc_core_check_processor_compat_hv(void)
{
- if (!cpu_has_feature(CPU_FTR_HVMODE) ||
- !cpu_has_feature(CPU_FTR_ARCH_206))
- return -EIO;
+ if (cpu_has_feature(CPU_FTR_HVMODE) &&
+ cpu_has_feature(CPU_FTR_ARCH_206))
+ return 0;
- return 0;
+ /* Can run as nested hypervisor on POWER9 in radix mode. */
+ if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled())
+ return 0;
+
+ return -EIO;
}
#ifdef CONFIG_KVM_XICS
@@ -5141,6 +5149,10 @@ static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
if (radix && !radix_enabled())
return -EINVAL;
+ /* If we're a nested hypervisor, we currently only support radix */
+ if (kvmhv_on_pseries() && !radix)
+ return -EINVAL;
+
mutex_lock(&kvm->lock);
if (radix != kvm_is_radix(kvm)) {
if (kvm->arch.mmu_ready) {
With this, the KVM-HV module can be loaded in a guest running under KVM-HV, and if the hypervisor supports nested virtualization, this guest can now act as a nested hypervisor and run nested guests. This also adds some checks to inform userspace that HPT guests are not supported by nested hypervisors, and to prevent userspace from configuring a guest to use HPT mode. Signed-off-by: Paul Mackerras <paulus@ozlabs.org> --- arch/powerpc/kvm/book3s_hv.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-)