KVM: PPC: Book3S HV: Add infrastructure for running HPT guests on radix host
This sets up the machinery for switching a guest between HPT (hashed
page table) and radix MMU modes, so that in future we can run a HPT
guest on a radix host on POWER9 machines.
* The KVM_PPC_CONFIGURE_V3_MMU ioctl can now specify either HPT or
radix mode, on a radix host.
* The KVM_CAP_PPC_MMU_HASH_V3 capability now returns 1 on POWER9
with HV KVM on a radix host.
* The KVM_PPC_GET_SMMU_INFO returns information about the HPT MMU on a
radix host.
* The KVM_PPC_ALLOCATE_HTAB ioctl on a radix host will switch the
guest to HPT mode and allocate a HPT.
* For simplicity, we now allocate the rmap array for each memslot,
even on a radix host, since it will be needed if the guest switches
to HPT mode.
* Since we cannot yet run a HPT guest on a radix host, the KVM_RUN
ioctl will return an EINVAL error in that case.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index a3746b9..a0b7f09 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -590,8 +590,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = !!(hv_enabled && radix_enabled());
break;
case KVM_CAP_PPC_MMU_HASH_V3:
- r = !!(hv_enabled && !radix_enabled() &&
- cpu_has_feature(CPU_FTR_ARCH_300));
+ r = !!(hv_enabled && cpu_has_feature(CPU_FTR_ARCH_300));
break;
#endif
case KVM_CAP_SYNC_MMU: