@@ -1860,6 +1860,76 @@ See KVM_GET_PIT2 for details on struct kvm_pit_state2.
This IOCTL replaces the obsolete KVM_SET_PIT.
+4.74 KVM_PPC_GET_SMMU_INFO
+
+Capability: KVM_CAP_PPC_GET_SMMU_INFO
+Architectures: powerpc
+Type: vm ioctl
+Parameters: None
+Returns: 0 on success, -1 on error
+
+This populates and returns a structure describing the features of
+the "Server" class MMU emulation supported by KVM.
+This can in turn be used by userspace to generate the appropariate
+device-tree properties for the guest operating system.
+
+The structure contains some global informations, followed by an
+array of supported segment page sizes:
+
+ struct kvm_ppc_smmu_info {
+ __u64 flags;
+ __u32 slb_size;
+ __u32 pad;
+ struct kvm_ppc_one_seg_page_size sps[KVM_PPC_PAGE_SIZES_MAX_SZ];
+ };
+
+The supported flags are:
+
+ - KVM_PPC_PAGE_SIZES_REAL:
+ When that flag is set, guest page sizes must "fit" the backing
+ store page sizes. When not set, any page size in the list can
+ be used regardless of how they are backed by userspace.
+
+ - KVM_PPC_1T_SEGMENTS
+ The emulated MMU supports 1T segments in addition to the
+ standard 256M ones.
+
+The "slb_size" field indicates how many SLB entries are supported
+
+The "sps" array contains 8 entries indicating the supported base
+page sizes for a segment in increasing order. Each entry is defined
+as follow:
+
+ struct kvm_ppc_one_seg_page_size {
+ __u32 page_shift; /* Base page shift of segment (or 0) */
+ __u32 slb_enc; /* SLB encoding for BookS */
+ struct kvm_ppc_one_page_size enc[KVM_PPC_PAGE_SIZES_MAX_SZ];
+ };
+
+An entry with a "page_shift" of 0 is unused. Because the array is
+organized in increasing order, a lookup can stop when encoutering
+such an entry.
+
+The "slb_enc" field provides the encoding to use in the SLB for the
+page size. The bits are in positions such as the value can directly
+be OR'ed into the "vsid" argument of the slbmte instruction.
+
+The "enc" array is a list which for each of those segment base page
+size provides the list of supported actual page sizes (which can be
+only larger or equal to the base page size), along with the
+corresponding encoding in the hash PTE. Similarily, the array is
+8 entries sorted by increasing sizes and an entry with a "0" shift
+is an empty entry and a terminator:
+
+ struct kvm_ppc_one_page_size {
+ __u32 page_shift; /* Page shift (or 0) */
+ __u32 pte_enc; /* Encoding in the HPTE (>>12) */
+ };
+
+The "pte_enc" field provides a value that can OR'ed into the hash
+PTE's RPN field (ie, it needs to be shifted left by 12 to OR it
+into the hash PTE second double word).
+
5. The kvm_run structure
------------------------
@@ -140,6 +140,8 @@ extern int kvmppc_core_prepare_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem);
extern void kvmppc_core_commit_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem);
+extern int kvm_vm_ioctl_get_smmu_info(struct kvm *kvm,
+ struct kvm_ppc_smmu_info *info);
extern int kvmppc_bookehv_init(void);
extern void kvmppc_bookehv_exit(void);
@@ -190,3 +190,7 @@ EXPORT_SYMBOL(__arch_hweight16);
EXPORT_SYMBOL(__arch_hweight32);
EXPORT_SYMBOL(__arch_hweight64);
#endif
+
+#ifdef CONFIG_PPC_BOOK3S_64
+EXPORT_SYMBOL_GPL(mmu_psize_defs);
+#endif
@@ -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.
*/
@@ -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)
{
@@ -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;
}
@@ -449,6 +449,30 @@ struct kvm_ppc_pvinfo {
__u8 pad[108];
};
+/* for KVM_PPC_GET_SMMU_INFO */
+#define KVM_PPC_PAGE_SIZES_MAX_SZ 8
+
+struct kvm_ppc_one_page_size {
+ __u32 page_shift; /* Page shift (or 0) */
+ __u32 pte_enc; /* Encoding in the HPTE (>>12) */
+};
+
+struct kvm_ppc_one_seg_page_size {
+ __u32 page_shift; /* Base page shift of segment (or 0) */
+ __u32 slb_enc; /* SLB encoding for BookS */
+ struct kvm_ppc_one_page_size enc[KVM_PPC_PAGE_SIZES_MAX_SZ];
+};
+
+#define KVM_PPC_PAGE_SIZES_REAL 0x00000001
+#define KVM_PPC_1T_SEGMENTS 0x00000002
+
+struct kvm_ppc_smmu_info {
+ __u64 flags;
+ __u32 slb_size;
+ __u32 pad;
+ struct kvm_ppc_one_seg_page_size sps[KVM_PPC_PAGE_SIZES_MAX_SZ];
+};
+
#define KVMIO 0xAE
/* machine type bits, to be used as argument to KVM_CREATE_VM */
@@ -591,6 +615,7 @@ struct kvm_ppc_pvinfo {
#define KVM_CAP_PCI_2_3 75
#define KVM_CAP_KVMCLOCK_CTRL 76
#define KVM_CAP_SIGNAL_MSI 77
+#define KVM_CAP_PPC_GET_SMMU_INFO 78
#ifdef KVM_CAP_IRQ_ROUTING
@@ -800,6 +825,8 @@ struct kvm_s390_ucas_mapping {
struct kvm_assigned_pci_dev)
/* Available with KVM_CAP_SIGNAL_MSI */
#define KVM_SIGNAL_MSI _IOW(KVMIO, 0xa5, struct kvm_msi)
+/* Available with KVM_CAP_PPC_GET_SMMU_INFO */
+#define KVM_PPC_GET_SMMU_INFO _IOR(KVMIO, 0xa6, struct kvm_ppc_smmu_info)
/*
* ioctls for vcpu fds