| 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License, version 2, as |
| 4 | * published by the Free Software Foundation. |
| 5 | * |
| 6 | * This program is distributed in the hope that it will be useful, |
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 9 | * GNU General Public License for more details. |
| 10 | * |
| 11 | * You should have received a copy of the GNU General Public License |
| 12 | * along with this program; if not, write to the Free Software |
| 13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 14 | * |
| 15 | * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| 16 | */ |
| 17 | |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/kvm.h> |
| 21 | #include <linux/kvm_host.h> |
| 22 | #include <linux/highmem.h> |
| 23 | #include <linux/gfp.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/hugetlb.h> |
| 26 | #include <linux/vmalloc.h> |
| 27 | |
| 28 | #include <asm/tlbflush.h> |
| 29 | #include <asm/kvm_ppc.h> |
| 30 | #include <asm/kvm_book3s.h> |
| 31 | #include <asm/mmu-hash64.h> |
| 32 | #include <asm/hvcall.h> |
| 33 | #include <asm/synch.h> |
| 34 | #include <asm/ppc-opcode.h> |
| 35 | #include <asm/cputable.h> |
| 36 | |
| 37 | /* Pages in the VRMA are 16MB pages */ |
| 38 | #define VRMA_PAGE_ORDER 24 |
| 39 | #define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */ |
| 40 | |
| 41 | /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ |
| 42 | #define MAX_LPID_970 63 |
| 43 | #define NR_LPIDS (LPID_RSVD + 1) |
| 44 | unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)]; |
| 45 | |
| 46 | long kvmppc_alloc_hpt(struct kvm *kvm) |
| 47 | { |
| 48 | unsigned long hpt; |
| 49 | unsigned long lpid; |
| 50 | struct revmap_entry *rev; |
| 51 | |
| 52 | /* Allocate guest's hashed page table */ |
| 53 | hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN, |
| 54 | HPT_ORDER - PAGE_SHIFT); |
| 55 | if (!hpt) { |
| 56 | pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n"); |
| 57 | return -ENOMEM; |
| 58 | } |
| 59 | kvm->arch.hpt_virt = hpt; |
| 60 | |
| 61 | /* Allocate reverse map array */ |
| 62 | rev = vmalloc(sizeof(struct revmap_entry) * HPT_NPTE); |
| 63 | if (!rev) { |
| 64 | pr_err("kvmppc_alloc_hpt: Couldn't alloc reverse map array\n"); |
| 65 | goto out_freehpt; |
| 66 | } |
| 67 | kvm->arch.revmap = rev; |
| 68 | |
| 69 | /* Allocate the guest's logical partition ID */ |
| 70 | do { |
| 71 | lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS); |
| 72 | if (lpid >= NR_LPIDS) { |
| 73 | pr_err("kvm_alloc_hpt: No LPIDs free\n"); |
| 74 | goto out_freeboth; |
| 75 | } |
| 76 | } while (test_and_set_bit(lpid, lpid_inuse)); |
| 77 | |
| 78 | kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18); |
| 79 | kvm->arch.lpid = lpid; |
| 80 | |
| 81 | pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid); |
| 82 | return 0; |
| 83 | |
| 84 | out_freeboth: |
| 85 | vfree(rev); |
| 86 | out_freehpt: |
| 87 | free_pages(hpt, HPT_ORDER - PAGE_SHIFT); |
| 88 | return -ENOMEM; |
| 89 | } |
| 90 | |
| 91 | void kvmppc_free_hpt(struct kvm *kvm) |
| 92 | { |
| 93 | clear_bit(kvm->arch.lpid, lpid_inuse); |
| 94 | vfree(kvm->arch.revmap); |
| 95 | free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT); |
| 96 | } |
| 97 | |
| 98 | void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem) |
| 99 | { |
| 100 | unsigned long i; |
| 101 | unsigned long npages; |
| 102 | unsigned long pa; |
| 103 | unsigned long *hpte; |
| 104 | unsigned long hash; |
| 105 | unsigned long porder = kvm->arch.ram_porder; |
| 106 | struct revmap_entry *rev; |
| 107 | unsigned long *physp; |
| 108 | |
| 109 | physp = kvm->arch.slot_phys[mem->slot]; |
| 110 | npages = kvm->arch.slot_npages[mem->slot]; |
| 111 | |
| 112 | /* VRMA can't be > 1TB */ |
| 113 | if (npages > 1ul << (40 - porder)) |
| 114 | npages = 1ul << (40 - porder); |
| 115 | /* Can't use more than 1 HPTE per HPTEG */ |
| 116 | if (npages > HPT_NPTEG) |
| 117 | npages = HPT_NPTEG; |
| 118 | |
| 119 | for (i = 0; i < npages; ++i) { |
| 120 | pa = physp[i]; |
| 121 | if (!pa) |
| 122 | break; |
| 123 | pa &= PAGE_MASK; |
| 124 | /* can't use hpt_hash since va > 64 bits */ |
| 125 | hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK; |
| 126 | /* |
| 127 | * We assume that the hash table is empty and no |
| 128 | * vcpus are using it at this stage. Since we create |
| 129 | * at most one HPTE per HPTEG, we just assume entry 7 |
| 130 | * is available and use it. |
| 131 | */ |
| 132 | hash = (hash << 3) + 7; |
| 133 | hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 4)); |
| 134 | /* HPTE low word - RPN, protection, etc. */ |
| 135 | hpte[1] = pa | HPTE_R_R | HPTE_R_C | HPTE_R_M | PP_RWXX; |
| 136 | smp_wmb(); |
| 137 | hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) | |
| 138 | (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED | |
| 139 | HPTE_V_LARGE | HPTE_V_VALID; |
| 140 | |
| 141 | /* Reverse map info */ |
| 142 | rev = &kvm->arch.revmap[hash]; |
| 143 | rev->guest_rpte = (i << porder) | HPTE_R_R | HPTE_R_C | |
| 144 | HPTE_R_M | PP_RWXX; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | int kvmppc_mmu_hv_init(void) |
| 149 | { |
| 150 | unsigned long host_lpid, rsvd_lpid; |
| 151 | |
| 152 | if (!cpu_has_feature(CPU_FTR_HVMODE)) |
| 153 | return -EINVAL; |
| 154 | |
| 155 | memset(lpid_inuse, 0, sizeof(lpid_inuse)); |
| 156 | |
| 157 | if (cpu_has_feature(CPU_FTR_ARCH_206)) { |
| 158 | host_lpid = mfspr(SPRN_LPID); /* POWER7 */ |
| 159 | rsvd_lpid = LPID_RSVD; |
| 160 | } else { |
| 161 | host_lpid = 0; /* PPC970 */ |
| 162 | rsvd_lpid = MAX_LPID_970; |
| 163 | } |
| 164 | |
| 165 | set_bit(host_lpid, lpid_inuse); |
| 166 | /* rsvd_lpid is reserved for use in partition switching */ |
| 167 | set_bit(rsvd_lpid, lpid_inuse); |
| 168 | |
| 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu) |
| 173 | { |
| 174 | } |
| 175 | |
| 176 | static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu) |
| 177 | { |
| 178 | kvmppc_set_msr(vcpu, MSR_SF | MSR_ME); |
| 179 | } |
| 180 | |
| 181 | static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr, |
| 182 | struct kvmppc_pte *gpte, bool data) |
| 183 | { |
| 184 | return -ENOENT; |
| 185 | } |
| 186 | |
| 187 | void *kvmppc_pin_guest_page(struct kvm *kvm, unsigned long gpa, |
| 188 | unsigned long *nb_ret) |
| 189 | { |
| 190 | struct kvm_memory_slot *memslot; |
| 191 | unsigned long gfn = gpa >> PAGE_SHIFT; |
| 192 | struct page *page; |
| 193 | unsigned long offset; |
| 194 | unsigned long pfn, pa; |
| 195 | unsigned long *physp; |
| 196 | |
| 197 | memslot = gfn_to_memslot(kvm, gfn); |
| 198 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
| 199 | return NULL; |
| 200 | physp = kvm->arch.slot_phys[memslot->id]; |
| 201 | if (!physp) |
| 202 | return NULL; |
| 203 | physp += (gfn - memslot->base_gfn) >> |
| 204 | (kvm->arch.ram_porder - PAGE_SHIFT); |
| 205 | pa = *physp; |
| 206 | if (!pa) |
| 207 | return NULL; |
| 208 | pfn = pa >> PAGE_SHIFT; |
| 209 | page = pfn_to_page(pfn); |
| 210 | get_page(page); |
| 211 | offset = gpa & (kvm->arch.ram_psize - 1); |
| 212 | if (nb_ret) |
| 213 | *nb_ret = kvm->arch.ram_psize - offset; |
| 214 | return page_address(page) + offset; |
| 215 | } |
| 216 | |
| 217 | void kvmppc_unpin_guest_page(struct kvm *kvm, void *va) |
| 218 | { |
| 219 | struct page *page = virt_to_page(va); |
| 220 | |
| 221 | page = compound_head(page); |
| 222 | put_page(page); |
| 223 | } |
| 224 | |
| 225 | void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu) |
| 226 | { |
| 227 | struct kvmppc_mmu *mmu = &vcpu->arch.mmu; |
| 228 | |
| 229 | if (cpu_has_feature(CPU_FTR_ARCH_206)) |
| 230 | vcpu->arch.slb_nr = 32; /* POWER7 */ |
| 231 | else |
| 232 | vcpu->arch.slb_nr = 64; |
| 233 | |
| 234 | mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate; |
| 235 | mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr; |
| 236 | |
| 237 | vcpu->arch.hflags |= BOOK3S_HFLAG_SLB; |
| 238 | } |