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KVM: PPC: Book3S HV: Add NO_HASH flag to GET_SMMU_INFO ioctl result

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This adds a KVM_PPC_NO_HASH flag to the flags field of the
kvm_ppc_smmu_info struct, and arranges for it to be set when
running as a nested hypervisor, as an unambiguous indication
to userspace that HPT guests are not supported.  Reporting the
KVM_CAP_PPC_MMU_HASH_V3 capability as false could be taken as
indicating only that the new HPT features in ISA V3.0 are not
supported, leaving it ambiguous whether pre-V3.0 HPT features
are supported.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Paul Mackerras
2018-10-08 14:24:30 +11:00
parent aa069a9969
commit 901f8c3f6f
3 changed files with 9 additions and 0 deletions
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4
arch/powerpc/kvm/book3s_hv.c
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@@ -4257,6 +4257,10 @@ static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01);
kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L);
/* If running as a nested hypervisor, we don't support HPT guests */
if (kvmhv_on_pseries())
info->flags |= KVM_PPC_NO_HASH;
return 0;
}