Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 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 | * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/string.h> |
| 11 | #include <linux/kvm.h> |
| 12 | #include <linux/kvm_host.h> |
| 13 | #include <linux/hugetlb.h> |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 14 | #include <linux/module.h> |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 15 | |
| 16 | #include <asm/tlbflush.h> |
| 17 | #include <asm/kvm_ppc.h> |
| 18 | #include <asm/kvm_book3s.h> |
| 19 | #include <asm/mmu-hash64.h> |
| 20 | #include <asm/hvcall.h> |
| 21 | #include <asm/synch.h> |
| 22 | #include <asm/ppc-opcode.h> |
| 23 | |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 24 | /* |
| 25 | * Since this file is built in even if KVM is a module, we need |
| 26 | * a local copy of this function for the case where kvm_main.c is |
| 27 | * modular. |
| 28 | */ |
| 29 | static struct kvm_memory_slot *builtin_gfn_to_memslot(struct kvm *kvm, |
| 30 | gfn_t gfn) |
| 31 | { |
| 32 | struct kvm_memslots *slots; |
| 33 | struct kvm_memory_slot *memslot; |
| 34 | |
| 35 | slots = kvm_memslots(kvm); |
| 36 | kvm_for_each_memslot(memslot, slots) |
| 37 | if (gfn >= memslot->base_gfn && |
| 38 | gfn < memslot->base_gfn + memslot->npages) |
| 39 | return memslot; |
| 40 | return NULL; |
| 41 | } |
| 42 | |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 43 | /* Translate address of a vmalloc'd thing to a linear map address */ |
| 44 | static void *real_vmalloc_addr(void *x) |
| 45 | { |
| 46 | unsigned long addr = (unsigned long) x; |
| 47 | pte_t *p; |
| 48 | |
| 49 | p = find_linux_pte(swapper_pg_dir, addr); |
| 50 | if (!p || !pte_present(*p)) |
| 51 | return NULL; |
| 52 | /* assume we don't have huge pages in vmalloc space... */ |
| 53 | addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK); |
| 54 | return __va(addr); |
| 55 | } |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 56 | |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 57 | /* |
| 58 | * Add this HPTE into the chain for the real page. |
| 59 | * Must be called with the chain locked; it unlocks the chain. |
| 60 | */ |
| 61 | static void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev, |
| 62 | unsigned long *rmap, long pte_index, int realmode) |
| 63 | { |
| 64 | struct revmap_entry *head, *tail; |
| 65 | unsigned long i; |
| 66 | |
| 67 | if (*rmap & KVMPPC_RMAP_PRESENT) { |
| 68 | i = *rmap & KVMPPC_RMAP_INDEX; |
| 69 | head = &kvm->arch.revmap[i]; |
| 70 | if (realmode) |
| 71 | head = real_vmalloc_addr(head); |
| 72 | tail = &kvm->arch.revmap[head->back]; |
| 73 | if (realmode) |
| 74 | tail = real_vmalloc_addr(tail); |
| 75 | rev->forw = i; |
| 76 | rev->back = head->back; |
| 77 | tail->forw = pte_index; |
| 78 | head->back = pte_index; |
| 79 | } else { |
| 80 | rev->forw = rev->back = pte_index; |
| 81 | i = pte_index; |
| 82 | } |
| 83 | smp_wmb(); |
| 84 | *rmap = i | KVMPPC_RMAP_REFERENCED | KVMPPC_RMAP_PRESENT; /* unlock */ |
| 85 | } |
| 86 | |
| 87 | /* Remove this HPTE from the chain for a real page */ |
| 88 | static void remove_revmap_chain(struct kvm *kvm, long pte_index, |
| 89 | unsigned long hpte_v) |
| 90 | { |
| 91 | struct revmap_entry *rev, *next, *prev; |
| 92 | unsigned long gfn, ptel, head; |
| 93 | struct kvm_memory_slot *memslot; |
| 94 | unsigned long *rmap; |
| 95 | |
| 96 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); |
| 97 | ptel = rev->guest_rpte; |
| 98 | gfn = hpte_rpn(ptel, hpte_page_size(hpte_v, ptel)); |
| 99 | memslot = builtin_gfn_to_memslot(kvm, gfn); |
| 100 | if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) |
| 101 | return; |
| 102 | |
| 103 | rmap = real_vmalloc_addr(&memslot->rmap[gfn - memslot->base_gfn]); |
| 104 | lock_rmap(rmap); |
| 105 | |
| 106 | head = *rmap & KVMPPC_RMAP_INDEX; |
| 107 | next = real_vmalloc_addr(&kvm->arch.revmap[rev->forw]); |
| 108 | prev = real_vmalloc_addr(&kvm->arch.revmap[rev->back]); |
| 109 | next->back = rev->back; |
| 110 | prev->forw = rev->forw; |
| 111 | if (head == pte_index) { |
| 112 | head = rev->forw; |
| 113 | if (head == pte_index) |
| 114 | *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX); |
| 115 | else |
| 116 | *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head; |
| 117 | } |
| 118 | unlock_rmap(rmap); |
| 119 | } |
| 120 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 121 | long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags, |
| 122 | long pte_index, unsigned long pteh, unsigned long ptel) |
| 123 | { |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 124 | struct kvm *kvm = vcpu->kvm; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 125 | unsigned long i, pa, gpa, gfn, psize; |
| 126 | unsigned long slot_fn; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 127 | unsigned long *hpte; |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 128 | struct revmap_entry *rev; |
| 129 | unsigned long g_ptel = ptel; |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 130 | struct kvm_memory_slot *memslot; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 131 | unsigned long *physp, pte_size; |
Paul Mackerras | 9d0ef5ea | 2011-12-12 12:32:27 +0000 | [diff] [blame] | 132 | unsigned long is_io; |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 133 | unsigned long *rmap; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 134 | bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 135 | |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 136 | psize = hpte_page_size(pteh, ptel); |
| 137 | if (!psize) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 138 | return H_PARAMETER; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 139 | pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID); |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 140 | |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 141 | /* Find the memslot (if any) for this address */ |
| 142 | gpa = (ptel & HPTE_R_RPN) & ~(psize - 1); |
| 143 | gfn = gpa >> PAGE_SHIFT; |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 144 | memslot = builtin_gfn_to_memslot(kvm, gfn); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 145 | pa = 0; |
| 146 | rmap = NULL; |
| 147 | if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) { |
| 148 | /* PPC970 can't do emulated MMIO */ |
| 149 | if (!cpu_has_feature(CPU_FTR_ARCH_206)) |
| 150 | return H_PARAMETER; |
| 151 | /* Emulated MMIO - mark this with key=31 */ |
| 152 | pteh |= HPTE_V_ABSENT; |
| 153 | ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO; |
| 154 | goto do_insert; |
| 155 | } |
Paul Mackerras | da9d1d7 | 2011-12-12 12:31:41 +0000 | [diff] [blame] | 156 | |
| 157 | /* Check if the requested page fits entirely in the memslot. */ |
| 158 | if (!slot_is_aligned(memslot, psize)) |
| 159 | return H_PARAMETER; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 160 | slot_fn = gfn - memslot->base_gfn; |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 161 | rmap = &memslot->rmap[slot_fn]; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 162 | |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 163 | physp = kvm->arch.slot_phys[memslot->id]; |
| 164 | if (!physp) |
| 165 | return H_PARAMETER; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 166 | physp += slot_fn; |
| 167 | if (realmode) |
| 168 | physp = real_vmalloc_addr(physp); |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 169 | pa = *physp; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 170 | if (!pa) |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 171 | return H_TOO_HARD; |
Paul Mackerras | 9d0ef5ea | 2011-12-12 12:32:27 +0000 | [diff] [blame] | 172 | is_io = pa & (HPTE_R_I | HPTE_R_W); |
Paul Mackerras | da9d1d7 | 2011-12-12 12:31:41 +0000 | [diff] [blame] | 173 | pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK); |
Paul Mackerras | b2b2f16 | 2011-12-12 12:28:21 +0000 | [diff] [blame] | 174 | pa &= PAGE_MASK; |
| 175 | |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 176 | if (pte_size < psize) |
| 177 | return H_PARAMETER; |
| 178 | if (pa && pte_size > psize) |
| 179 | pa |= gpa & (pte_size - 1); |
| 180 | |
| 181 | ptel &= ~(HPTE_R_PP0 - psize); |
| 182 | ptel |= pa; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 183 | pteh |= HPTE_V_VALID; |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 184 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 185 | /* Check WIMG */ |
Paul Mackerras | 9d0ef5ea | 2011-12-12 12:32:27 +0000 | [diff] [blame] | 186 | if (!hpte_cache_flags_ok(ptel, is_io)) { |
| 187 | if (is_io) |
| 188 | return H_PARAMETER; |
| 189 | /* |
| 190 | * Allow guest to map emulated device memory as |
| 191 | * uncacheable, but actually make it cacheable. |
| 192 | */ |
| 193 | ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G); |
| 194 | ptel |= HPTE_R_M; |
| 195 | } |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 196 | |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 197 | do_insert: |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 198 | if (pte_index >= HPT_NPTE) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 199 | return H_PARAMETER; |
| 200 | if (likely((flags & H_EXACT) == 0)) { |
| 201 | pte_index &= ~7UL; |
| 202 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 203 | for (i = 0; i < 8; ++i) { |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 204 | if ((*hpte & HPTE_V_VALID) == 0 && |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 205 | try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
| 206 | HPTE_V_ABSENT)) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 207 | break; |
| 208 | hpte += 2; |
| 209 | } |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 210 | if (i == 8) { |
| 211 | /* |
| 212 | * Since try_lock_hpte doesn't retry (not even stdcx. |
| 213 | * failures), it could be that there is a free slot |
| 214 | * but we transiently failed to lock it. Try again, |
| 215 | * actually locking each slot and checking it. |
| 216 | */ |
| 217 | hpte -= 16; |
| 218 | for (i = 0; i < 8; ++i) { |
| 219 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
| 220 | cpu_relax(); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 221 | if (!(*hpte & (HPTE_V_VALID | HPTE_V_ABSENT))) |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 222 | break; |
| 223 | *hpte &= ~HPTE_V_HVLOCK; |
| 224 | hpte += 2; |
| 225 | } |
| 226 | if (i == 8) |
| 227 | return H_PTEG_FULL; |
| 228 | } |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 229 | pte_index += i; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 230 | } else { |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 231 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 232 | if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID | |
| 233 | HPTE_V_ABSENT)) { |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 234 | /* Lock the slot and check again */ |
| 235 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
| 236 | cpu_relax(); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 237 | if (*hpte & (HPTE_V_VALID | HPTE_V_ABSENT)) { |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 238 | *hpte &= ~HPTE_V_HVLOCK; |
| 239 | return H_PTEG_FULL; |
| 240 | } |
| 241 | } |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 242 | } |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 243 | |
| 244 | /* Save away the guest's idea of the second HPTE dword */ |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 245 | rev = &kvm->arch.revmap[pte_index]; |
| 246 | if (realmode) |
| 247 | rev = real_vmalloc_addr(rev); |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 248 | if (rev) |
| 249 | rev->guest_rpte = g_ptel; |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 250 | |
| 251 | /* Link HPTE into reverse-map chain */ |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 252 | if (pteh & HPTE_V_VALID) { |
| 253 | if (realmode) |
| 254 | rmap = real_vmalloc_addr(rmap); |
| 255 | lock_rmap(rmap); |
| 256 | kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index, realmode); |
| 257 | } |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 258 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 259 | hpte[1] = ptel; |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 260 | |
| 261 | /* Write the first HPTE dword, unlocking the HPTE and making it valid */ |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 262 | eieio(); |
| 263 | hpte[0] = pteh; |
| 264 | asm volatile("ptesync" : : : "memory"); |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 265 | |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 266 | vcpu->arch.gpr[4] = pte_index; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 267 | return H_SUCCESS; |
| 268 | } |
Paul Mackerras | c77162d | 2011-12-12 12:31:00 +0000 | [diff] [blame] | 269 | EXPORT_SYMBOL_GPL(kvmppc_h_enter); |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 270 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 271 | #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token)) |
| 272 | |
| 273 | static inline int try_lock_tlbie(unsigned int *lock) |
| 274 | { |
| 275 | unsigned int tmp, old; |
| 276 | unsigned int token = LOCK_TOKEN; |
| 277 | |
| 278 | asm volatile("1:lwarx %1,0,%2\n" |
| 279 | " cmpwi cr0,%1,0\n" |
| 280 | " bne 2f\n" |
| 281 | " stwcx. %3,0,%2\n" |
| 282 | " bne- 1b\n" |
| 283 | " isync\n" |
| 284 | "2:" |
| 285 | : "=&r" (tmp), "=&r" (old) |
| 286 | : "r" (lock), "r" (token) |
| 287 | : "cc", "memory"); |
| 288 | return old == 0; |
| 289 | } |
| 290 | |
| 291 | long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags, |
| 292 | unsigned long pte_index, unsigned long avpn, |
| 293 | unsigned long va) |
| 294 | { |
| 295 | struct kvm *kvm = vcpu->kvm; |
| 296 | unsigned long *hpte; |
| 297 | unsigned long v, r, rb; |
| 298 | |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 299 | if (pte_index >= HPT_NPTE) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 300 | return H_PARAMETER; |
| 301 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 302 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 303 | cpu_relax(); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 304 | if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 305 | ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) || |
| 306 | ((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) { |
| 307 | hpte[0] &= ~HPTE_V_HVLOCK; |
| 308 | return H_NOT_FOUND; |
| 309 | } |
| 310 | if (atomic_read(&kvm->online_vcpus) == 1) |
| 311 | flags |= H_LOCAL; |
| 312 | vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK; |
| 313 | vcpu->arch.gpr[5] = r = hpte[1]; |
| 314 | rb = compute_tlbie_rb(v, r, pte_index); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 315 | if (v & HPTE_V_VALID) |
| 316 | remove_revmap_chain(kvm, pte_index, v); |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 317 | smp_wmb(); |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 318 | hpte[0] = 0; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 319 | if (!(v & HPTE_V_VALID)) |
| 320 | return H_SUCCESS; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 321 | if (!(flags & H_LOCAL)) { |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 322 | while (!try_lock_tlbie(&kvm->arch.tlbie_lock)) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 323 | cpu_relax(); |
| 324 | asm volatile("ptesync" : : : "memory"); |
| 325 | asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" |
| 326 | : : "r" (rb), "r" (kvm->arch.lpid)); |
| 327 | asm volatile("ptesync" : : : "memory"); |
| 328 | kvm->arch.tlbie_lock = 0; |
| 329 | } else { |
| 330 | asm volatile("ptesync" : : : "memory"); |
| 331 | asm volatile("tlbiel %0" : : "r" (rb)); |
| 332 | asm volatile("ptesync" : : : "memory"); |
| 333 | } |
| 334 | return H_SUCCESS; |
| 335 | } |
| 336 | |
| 337 | long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu) |
| 338 | { |
| 339 | struct kvm *kvm = vcpu->kvm; |
| 340 | unsigned long *args = &vcpu->arch.gpr[4]; |
| 341 | unsigned long *hp, tlbrb[4]; |
| 342 | long int i, found; |
| 343 | long int n_inval = 0; |
| 344 | unsigned long flags, req, pte_index; |
| 345 | long int local = 0; |
| 346 | long int ret = H_SUCCESS; |
| 347 | |
| 348 | if (atomic_read(&kvm->online_vcpus) == 1) |
| 349 | local = 1; |
| 350 | for (i = 0; i < 4; ++i) { |
| 351 | pte_index = args[i * 2]; |
| 352 | flags = pte_index >> 56; |
| 353 | pte_index &= ((1ul << 56) - 1); |
| 354 | req = flags >> 6; |
| 355 | flags &= 3; |
| 356 | if (req == 3) |
| 357 | break; |
| 358 | if (req != 1 || flags == 3 || |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 359 | pte_index >= HPT_NPTE) { |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 360 | /* parameter error */ |
| 361 | args[i * 2] = ((0xa0 | flags) << 56) + pte_index; |
| 362 | ret = H_PARAMETER; |
| 363 | break; |
| 364 | } |
| 365 | hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 366 | while (!try_lock_hpte(hp, HPTE_V_HVLOCK)) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 367 | cpu_relax(); |
| 368 | found = 0; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 369 | if (hp[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) { |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 370 | switch (flags & 3) { |
| 371 | case 0: /* absolute */ |
| 372 | found = 1; |
| 373 | break; |
| 374 | case 1: /* andcond */ |
| 375 | if (!(hp[0] & args[i * 2 + 1])) |
| 376 | found = 1; |
| 377 | break; |
| 378 | case 2: /* AVPN */ |
| 379 | if ((hp[0] & ~0x7fUL) == args[i * 2 + 1]) |
| 380 | found = 1; |
| 381 | break; |
| 382 | } |
| 383 | } |
| 384 | if (!found) { |
| 385 | hp[0] &= ~HPTE_V_HVLOCK; |
| 386 | args[i * 2] = ((0x90 | flags) << 56) + pte_index; |
| 387 | continue; |
| 388 | } |
| 389 | /* insert R and C bits from PTE */ |
| 390 | flags |= (hp[1] >> 5) & 0x0c; |
| 391 | args[i * 2] = ((0x80 | flags) << 56) + pte_index; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 392 | if (hp[0] & HPTE_V_VALID) { |
| 393 | tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index); |
| 394 | remove_revmap_chain(kvm, pte_index, hp[0]); |
| 395 | } |
Paul Mackerras | 06ce2c6 | 2011-12-12 12:33:07 +0000 | [diff] [blame] | 396 | smp_wmb(); |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 397 | hp[0] = 0; |
| 398 | } |
| 399 | if (n_inval == 0) |
| 400 | return ret; |
| 401 | |
| 402 | if (!local) { |
| 403 | while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) |
| 404 | cpu_relax(); |
| 405 | asm volatile("ptesync" : : : "memory"); |
| 406 | for (i = 0; i < n_inval; ++i) |
| 407 | asm volatile(PPC_TLBIE(%1,%0) |
| 408 | : : "r" (tlbrb[i]), "r" (kvm->arch.lpid)); |
| 409 | asm volatile("eieio; tlbsync; ptesync" : : : "memory"); |
| 410 | kvm->arch.tlbie_lock = 0; |
| 411 | } else { |
| 412 | asm volatile("ptesync" : : : "memory"); |
| 413 | for (i = 0; i < n_inval; ++i) |
| 414 | asm volatile("tlbiel %0" : : "r" (tlbrb[i])); |
| 415 | asm volatile("ptesync" : : : "memory"); |
| 416 | } |
| 417 | return ret; |
| 418 | } |
| 419 | |
| 420 | long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags, |
| 421 | unsigned long pte_index, unsigned long avpn, |
| 422 | unsigned long va) |
| 423 | { |
| 424 | struct kvm *kvm = vcpu->kvm; |
| 425 | unsigned long *hpte; |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 426 | struct revmap_entry *rev; |
| 427 | unsigned long v, r, rb, mask, bits; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 428 | |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 429 | if (pte_index >= HPT_NPTE) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 430 | return H_PARAMETER; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 431 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 432 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
Paul Mackerras | 075295d | 2011-12-12 12:30:16 +0000 | [diff] [blame] | 433 | while (!try_lock_hpte(hpte, HPTE_V_HVLOCK)) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 434 | cpu_relax(); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 435 | if ((hpte[0] & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 || |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 436 | ((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) { |
| 437 | hpte[0] &= ~HPTE_V_HVLOCK; |
| 438 | return H_NOT_FOUND; |
| 439 | } |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 440 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 441 | if (atomic_read(&kvm->online_vcpus) == 1) |
| 442 | flags |= H_LOCAL; |
| 443 | v = hpte[0]; |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 444 | bits = (flags << 55) & HPTE_R_PP0; |
| 445 | bits |= (flags << 48) & HPTE_R_KEY_HI; |
| 446 | bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO); |
| 447 | |
| 448 | /* Update guest view of 2nd HPTE dword */ |
| 449 | mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N | |
| 450 | HPTE_R_KEY_HI | HPTE_R_KEY_LO; |
| 451 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); |
| 452 | if (rev) { |
| 453 | r = (rev->guest_rpte & ~mask) | bits; |
| 454 | rev->guest_rpte = r; |
| 455 | } |
| 456 | r = (hpte[1] & ~mask) | bits; |
| 457 | |
| 458 | /* Update HPTE */ |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 459 | if (v & HPTE_V_VALID) { |
| 460 | rb = compute_tlbie_rb(v, r, pte_index); |
| 461 | hpte[0] = v & ~HPTE_V_VALID; |
| 462 | if (!(flags & H_LOCAL)) { |
| 463 | while(!try_lock_tlbie(&kvm->arch.tlbie_lock)) |
| 464 | cpu_relax(); |
| 465 | asm volatile("ptesync" : : : "memory"); |
| 466 | asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync" |
| 467 | : : "r" (rb), "r" (kvm->arch.lpid)); |
| 468 | asm volatile("ptesync" : : : "memory"); |
| 469 | kvm->arch.tlbie_lock = 0; |
| 470 | } else { |
| 471 | asm volatile("ptesync" : : : "memory"); |
| 472 | asm volatile("tlbiel %0" : : "r" (rb)); |
| 473 | asm volatile("ptesync" : : : "memory"); |
| 474 | } |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 475 | } |
| 476 | hpte[1] = r; |
| 477 | eieio(); |
| 478 | hpte[0] = v & ~HPTE_V_HVLOCK; |
| 479 | asm volatile("ptesync" : : : "memory"); |
| 480 | return H_SUCCESS; |
| 481 | } |
| 482 | |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 483 | long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags, |
| 484 | unsigned long pte_index) |
| 485 | { |
| 486 | struct kvm *kvm = vcpu->kvm; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 487 | unsigned long *hpte, v, r; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 488 | int i, n = 1; |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 489 | struct revmap_entry *rev = NULL; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 490 | |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 491 | if (pte_index >= HPT_NPTE) |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 492 | return H_PARAMETER; |
| 493 | if (flags & H_READ_4) { |
| 494 | pte_index &= ~3; |
| 495 | n = 4; |
| 496 | } |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 497 | if (flags & H_R_XLATE) |
| 498 | rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]); |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 499 | for (i = 0; i < n; ++i, ++pte_index) { |
| 500 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4)); |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 501 | v = hpte[0] & ~HPTE_V_HVLOCK; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 502 | r = hpte[1]; |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 503 | if (v & HPTE_V_ABSENT) { |
| 504 | v &= ~HPTE_V_ABSENT; |
| 505 | v |= HPTE_V_VALID; |
| 506 | } |
| 507 | if (v & HPTE_V_VALID) { |
Paul Mackerras | 8936dda | 2011-12-12 12:27:39 +0000 | [diff] [blame] | 508 | if (rev) |
| 509 | r = rev[i].guest_rpte; |
| 510 | else |
| 511 | r = hpte[1] | HPTE_R_RPN; |
| 512 | } |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 513 | vcpu->arch.gpr[4 + i * 2] = v; |
Paul Mackerras | a8606e2 | 2011-06-29 00:22:05 +0000 | [diff] [blame] | 514 | vcpu->arch.gpr[5 + i * 2] = r; |
| 515 | } |
| 516 | return H_SUCCESS; |
| 517 | } |
Paul Mackerras | 697d389 | 2011-12-12 12:36:37 +0000 | [diff] [blame^] | 518 | |
| 519 | static int slb_base_page_shift[4] = { |
| 520 | 24, /* 16M */ |
| 521 | 16, /* 64k */ |
| 522 | 34, /* 16G */ |
| 523 | 20, /* 1M, unsupported */ |
| 524 | }; |
| 525 | |
| 526 | long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v, |
| 527 | unsigned long valid) |
| 528 | { |
| 529 | unsigned int i; |
| 530 | unsigned int pshift; |
| 531 | unsigned long somask; |
| 532 | unsigned long vsid, hash; |
| 533 | unsigned long avpn; |
| 534 | unsigned long *hpte; |
| 535 | unsigned long mask, val; |
| 536 | unsigned long v, r; |
| 537 | |
| 538 | /* Get page shift, work out hash and AVPN etc. */ |
| 539 | mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY; |
| 540 | val = 0; |
| 541 | pshift = 12; |
| 542 | if (slb_v & SLB_VSID_L) { |
| 543 | mask |= HPTE_V_LARGE; |
| 544 | val |= HPTE_V_LARGE; |
| 545 | pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4]; |
| 546 | } |
| 547 | if (slb_v & SLB_VSID_B_1T) { |
| 548 | somask = (1UL << 40) - 1; |
| 549 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T; |
| 550 | vsid ^= vsid << 25; |
| 551 | } else { |
| 552 | somask = (1UL << 28) - 1; |
| 553 | vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT; |
| 554 | } |
| 555 | hash = (vsid ^ ((eaddr & somask) >> pshift)) & HPT_HASH_MASK; |
| 556 | avpn = slb_v & ~(somask >> 16); /* also includes B */ |
| 557 | avpn |= (eaddr & somask) >> 16; |
| 558 | |
| 559 | if (pshift >= 24) |
| 560 | avpn &= ~((1UL << (pshift - 16)) - 1); |
| 561 | else |
| 562 | avpn &= ~0x7fUL; |
| 563 | val |= avpn; |
| 564 | |
| 565 | for (;;) { |
| 566 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (hash << 7)); |
| 567 | |
| 568 | for (i = 0; i < 16; i += 2) { |
| 569 | /* Read the PTE racily */ |
| 570 | v = hpte[i] & ~HPTE_V_HVLOCK; |
| 571 | |
| 572 | /* Check valid/absent, hash, segment size and AVPN */ |
| 573 | if (!(v & valid) || (v & mask) != val) |
| 574 | continue; |
| 575 | |
| 576 | /* Lock the PTE and read it under the lock */ |
| 577 | while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK)) |
| 578 | cpu_relax(); |
| 579 | v = hpte[i] & ~HPTE_V_HVLOCK; |
| 580 | r = hpte[i+1]; |
| 581 | |
| 582 | /* |
| 583 | * Check the HPTE again, including large page size |
| 584 | * Since we don't currently allow any MPSS (mixed |
| 585 | * page-size segment) page sizes, it is sufficient |
| 586 | * to check against the actual page size. |
| 587 | */ |
| 588 | if ((v & valid) && (v & mask) == val && |
| 589 | hpte_page_size(v, r) == (1ul << pshift)) |
| 590 | /* Return with the HPTE still locked */ |
| 591 | return (hash << 3) + (i >> 1); |
| 592 | |
| 593 | /* Unlock and move on */ |
| 594 | hpte[i] = v; |
| 595 | } |
| 596 | |
| 597 | if (val & HPTE_V_SECONDARY) |
| 598 | break; |
| 599 | val |= HPTE_V_SECONDARY; |
| 600 | hash = hash ^ HPT_HASH_MASK; |
| 601 | } |
| 602 | return -1; |
| 603 | } |
| 604 | EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte); |
| 605 | |
| 606 | /* |
| 607 | * Called in real mode to check whether an HPTE not found fault |
| 608 | * is due to accessing an emulated MMIO page. |
| 609 | * Returns a possibly modified status (DSISR) value if not |
| 610 | * (i.e. pass the interrupt to the guest), |
| 611 | * -1 to pass the fault up to host kernel mode code, -2 to do that |
| 612 | * and also load the instruction word, |
| 613 | * or 0 if we should make the guest retry the access. |
| 614 | */ |
| 615 | long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr, |
| 616 | unsigned long slb_v, unsigned int status) |
| 617 | { |
| 618 | struct kvm *kvm = vcpu->kvm; |
| 619 | long int index; |
| 620 | unsigned long v, r, gr; |
| 621 | unsigned long *hpte; |
| 622 | unsigned long valid; |
| 623 | struct revmap_entry *rev; |
| 624 | unsigned long pp, key; |
| 625 | |
| 626 | valid = HPTE_V_VALID | HPTE_V_ABSENT; |
| 627 | index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid); |
| 628 | if (index < 0) |
| 629 | return status; /* there really was no HPTE */ |
| 630 | |
| 631 | hpte = (unsigned long *)(kvm->arch.hpt_virt + (index << 4)); |
| 632 | v = hpte[0] & ~HPTE_V_HVLOCK; |
| 633 | r = hpte[1]; |
| 634 | rev = real_vmalloc_addr(&kvm->arch.revmap[index]); |
| 635 | gr = rev->guest_rpte; |
| 636 | |
| 637 | /* Unlock the HPTE */ |
| 638 | asm volatile("lwsync" : : : "memory"); |
| 639 | hpte[0] = v; |
| 640 | |
| 641 | /* If the HPTE is valid by now, retry the instruction */ |
| 642 | if (v & HPTE_V_VALID) |
| 643 | return 0; |
| 644 | |
| 645 | /* Check access permissions to the page */ |
| 646 | pp = gr & (HPTE_R_PP0 | HPTE_R_PP); |
| 647 | key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS; |
| 648 | if (status & DSISR_ISSTORE) { |
| 649 | /* check write permission */ |
| 650 | if (!hpte_write_permission(pp, slb_v & key)) |
| 651 | goto protfault; |
| 652 | } else { |
| 653 | if (!hpte_read_permission(pp, slb_v & key)) |
| 654 | goto protfault; |
| 655 | } |
| 656 | |
| 657 | /* Check storage key, if applicable */ |
| 658 | if (vcpu->arch.shregs.msr & MSR_DR) { |
| 659 | unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr); |
| 660 | if (status & DSISR_ISSTORE) |
| 661 | perm >>= 1; |
| 662 | if (perm & 1) |
| 663 | return (status & ~DSISR_NOHPTE) | DSISR_KEYFAULT; |
| 664 | } |
| 665 | |
| 666 | /* Save HPTE info for virtual-mode handler */ |
| 667 | vcpu->arch.pgfault_addr = addr; |
| 668 | vcpu->arch.pgfault_index = index; |
| 669 | vcpu->arch.pgfault_hpte[0] = v; |
| 670 | vcpu->arch.pgfault_hpte[1] = r; |
| 671 | |
| 672 | if (vcpu->arch.shregs.msr & MSR_IR) |
| 673 | return -2; /* MMIO emulation - load instr word */ |
| 674 | |
| 675 | return -1; /* send fault up to host kernel mode */ |
| 676 | |
| 677 | protfault: |
| 678 | return (status & ~DSISR_NOHPTE) | DSISR_PROTFAULT; |
| 679 | } |