kvm/powerpc: Add new ioctl to retreive server MMU infos

This is necessary for qemu to be able to pass the right information
to the guest, such as the supported page sizes and corresponding
encodings in the SLB and hash table, which can vary depending
on the processor type, the type of KVM used (PR vs HV) and the
version of KVM

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[agraf: fix compilation on hv, adjust for newer ioctl numbers]
Signed-off-by: Alexander Graf <agraf@suse.de>

3 files changed, 74 insertions, 1 deletions

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 59c296743595..bb5a0f4b4bbb 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1175,6 +1175,38 @@ long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
         return fd;
 }
 
+static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
+                                     int linux_psize)
+{
+        struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];
+
+        if (!def->shift)
+                return;
+        (*sps)->page_shift = def->shift;
+        (*sps)->slb_enc = def->sllp;
+        (*sps)->enc[0].page_shift = def->shift;
+        (*sps)->enc[0].pte_enc = def->penc;
+        (*sps)++;
+}
+
+int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
+{
+        struct kvm_ppc_one_seg_page_size *sps;
+
+        info->flags = KVM_PPC_PAGE_SIZES_REAL;
+        if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
+                info->flags |= KVM_PPC_1T_SEGMENTS;
+        info->slb_size = mmu_slb_size;
+
+        /* We only support these sizes for now, and no muti-size segments */
+        sps = &info->sps[0];
+        kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
+        kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
+        kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);
+
+        return 0;
+}
+
 /*
  * Get (and clear) the dirty memory log for a memory slot.
  */
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 815ac5938a9e..a1baec340f7e 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1158,6 +1158,31 @@ out:
         return r;
 }
 
+#ifdef CONFIG_PPC64
+int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm, struct kvm_ppc_smmu_info *info)
+{
+        /* No flags */
+        info->flags = 0;
+
+        /* SLB is always 64 entries */
+        info->slb_size = 64;
+
+        /* Standard 4k base page size segment */
+        info->sps[0].page_shift = 12;
+        info->sps[0].slb_enc = 0;
+        info->sps[0].enc[0].page_shift = 12;
+        info->sps[0].enc[0].pte_enc = 0;
+
+        /* Standard 16M large page size segment */
+        info->sps[1].page_shift = 24;
+        info->sps[1].slb_enc = SLB_VSID_L;
+        info->sps[1].enc[0].page_shift = 24;
+        info->sps[1].enc[0].pte_enc = 0;
+
+        return 0;
+}
+#endif /* CONFIG_PPC64 */
+
 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
                                       struct kvm_userspace_memory_region *mem)
 {
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 6ac31154d170..1493c8de947b 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -279,6 +279,11 @@ int kvm_dev_ioctl_check_extension(long ext)
         case KVM_CAP_MAX_VCPUS:
                 r = KVM_MAX_VCPUS;
                 break;
+#ifdef CONFIG_PPC_BOOK3S_64
+        case KVM_CAP_PPC_GET_SMMU_INFO:
+                r = 1;
+                break;
+#endif
         default:
                 r = 0;
                 break;
@@ -718,7 +723,6 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
                 break;
         }
 #endif
-
         default:
                 r = -EINVAL;
         }
@@ -800,6 +804,18 @@ long kvm_arch_vm_ioctl(struct file *filp,
         }
 #endif /* CONFIG_KVM_BOOK3S_64_HV */
 
+#ifdef CONFIG_PPC_BOOK3S_64
+        case KVM_PPC_GET_SMMU_INFO: {
+                struct kvm *kvm = filp->private_data;
+                struct kvm_ppc_smmu_info info;
+
+                memset(&info, 0, sizeof(info));
+                r = kvm_vm_ioctl_get_smmu_info(kvm, &info);
+                if (r >= 0 && copy_to_user(argp, &info, sizeof(info)))
+                        r = -EFAULT;
+                break;
+        }
+#endif /* CONFIG_PPC_BOOK3S_64 */
         default:
                 r = -ENOTTY;
         }