This adds the implementation of the KVM_PPC_CONFIGURE_V3_MMU ioctl
for HPT guests on POWER9. With this, we can return 1 for the
KVM_CAP_PPC_MMU_HASH_V3 capability.
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
---
arch/powerpc/include/asm/kvm_host.h | 1 +
arch/powerpc/kvm/book3s_hv.c | 35 +++++++++++++++++++++++++++++++----
arch/powerpc/kvm/powerpc.c | 2 +-
3 files changed, 33 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index e59b172..944532d 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -264,6 +264,7 @@ struct kvm_arch {
atomic_t hpte_mod_interest;
cpumask_t need_tlb_flush;
int hpt_cma_alloc;
+ u64 process_table;
struct dentry *debugfs_dir;
struct dentry *htab_dentry;
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 255c6f9..e925d6a 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3092,8 +3092,8 @@ static void kvmppc_setup_partition_table(struct kvm *kvm)
/* HTABSIZE and HTABORG fields */
dw0 |= kvm->arch.sdr1;
- /* Second dword has GR=0; other fields are unused since UPRT=0 */
- dw1 = 0;
+ /* Second dword as set by userspace */
+ dw1 = kvm->arch.process_table;
mmu_partition_table_set_entry(kvm->arch.lpid, dw0, dw1);
}
@@ -3658,10 +3658,37 @@ static void init_default_hcalls(void)
}
}
-/* dummy implementations for now */
static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
{
- return -EINVAL;
+ unsigned long lpcr;
+
+ /* If not on a POWER9, reject it */
+ if (!cpu_has_feature(CPU_FTR_ARCH_300))
+ return -ENODEV;
+
+ /* If any unknown flags set, reject it */
+ if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE))
+ return -EINVAL;
+
+ /* We can't do radix yet */
+ if (cfg->flags & KVM_PPC_MMUV3_RADIX)
+ return -EINVAL;
+
+ /* GR (guest radix) bit in process_table field must match */
+ if (cfg->process_table & PATB_GR)
+ return -EINVAL;
+
+ /* Process table size field must be reasonable, i.e. <= 24 */
+ if ((cfg->process_table & PRTS_MASK) > 24)
+ return -EINVAL;
+
+ kvm->arch.process_table = cfg->process_table;
+ kvmppc_setup_partition_table(kvm);
+
+ lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0;
+ kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE);
+
+ return 0;
}
static int kvmhv_get_rmmu_info(struct kvm *kvm, struct kvm_ppc_rmmu_info *info)
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index aefaca0..5d8c690 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -569,7 +569,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = !!(0 && hv_enabled && radix_enabled());
break;
case KVM_CAP_PPC_MMU_HASH_V3:
- r = !!(0 && hv_enabled && !radix_enabled() &&
+ r = !!(hv_enabled && !radix_enabled() &&
cpu_has_feature(CPU_FTR_ARCH_300));
break;
#endif
--
2.10.2
--
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