Commit 901f8c3f authored by Paul Mackerras's avatar Paul Mackerras

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

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: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent aa069a99
......@@ -2270,6 +2270,10 @@ The supported flags are:
The emulated MMU supports 1T segments in addition to the
standard 256M ones.
- KVM_PPC_NO_HASH
This flag indicates that HPT guests are not supported by KVM,
thus all guests must use radix MMU mode.
The "slb_size" field indicates how many SLB entries are supported
The "sps" array contains 8 entries indicating the supported base
......
......@@ -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;
}
......
......@@ -719,6 +719,7 @@ struct kvm_ppc_one_seg_page_size {
#define KVM_PPC_PAGE_SIZES_REAL 0x00000001
#define KVM_PPC_1T_SEGMENTS 0x00000002
#define KVM_PPC_NO_HASH 0x00000004
struct kvm_ppc_smmu_info {
__u64 flags;
......
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