David Gibson | 54738c0 | 2011-06-29 00:22:41 +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 | * 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 | * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com> |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 17 | * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com> |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/kvm.h> |
| 23 | #include <linux/kvm_host.h> |
| 24 | #include <linux/highmem.h> |
| 25 | #include <linux/gfp.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/hugetlb.h> |
| 28 | #include <linux/list.h> |
| 29 | |
| 30 | #include <asm/tlbflush.h> |
| 31 | #include <asm/kvm_ppc.h> |
| 32 | #include <asm/kvm_book3s.h> |
Aneesh Kumar K.V | f64e808 | 2016-03-01 12:59:20 +0530 | [diff] [blame] | 33 | #include <asm/book3s/64/mmu-hash.h> |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 34 | #include <asm/mmu_context.h> |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 35 | #include <asm/hvcall.h> |
| 36 | #include <asm/synch.h> |
| 37 | #include <asm/ppc-opcode.h> |
| 38 | #include <asm/kvm_host.h> |
| 39 | #include <asm/udbg.h> |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 40 | #include <asm/iommu.h> |
Alexey Kardashevskiy | 5ee7af1 | 2016-02-15 12:55:08 +1100 | [diff] [blame] | 41 | #include <asm/tce.h> |
Aneesh Kumar K.V | 94171b1 | 2017-07-27 11:54:53 +0530 | [diff] [blame] | 42 | #include <asm/pte-walk.h> |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 43 | |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 44 | #ifdef CONFIG_BUG |
| 45 | |
| 46 | #define WARN_ON_ONCE_RM(condition) ({ \ |
| 47 | static bool __section(.data.unlikely) __warned; \ |
| 48 | int __ret_warn_once = !!(condition); \ |
| 49 | \ |
| 50 | if (unlikely(__ret_warn_once && !__warned)) { \ |
| 51 | __warned = true; \ |
| 52 | pr_err("WARN_ON_ONCE_RM: (%s) at %s:%u\n", \ |
| 53 | __stringify(condition), \ |
| 54 | __func__, __LINE__); \ |
| 55 | dump_stack(); \ |
| 56 | } \ |
| 57 | unlikely(__ret_warn_once); \ |
| 58 | }) |
| 59 | |
| 60 | #else |
| 61 | |
| 62 | #define WARN_ON_ONCE_RM(condition) ({ \ |
| 63 | int __ret_warn_on = !!(condition); \ |
| 64 | unlikely(__ret_warn_on); \ |
| 65 | }) |
| 66 | |
| 67 | #endif |
| 68 | |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 69 | #define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64)) |
| 70 | |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 71 | /* |
| 72 | * Finds a TCE table descriptor by LIOBN. |
| 73 | * |
| 74 | * WARNING: This will be called in real or virtual mode on HV KVM and virtual |
| 75 | * mode on PR KVM |
| 76 | */ |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 77 | struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm *kvm, |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 78 | unsigned long liobn) |
| 79 | { |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 80 | struct kvmppc_spapr_tce_table *stt; |
| 81 | |
Alexey Kardashevskiy | 366baf2 | 2016-02-15 12:55:05 +1100 | [diff] [blame] | 82 | list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list) |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 83 | if (stt->liobn == liobn) |
| 84 | return stt; |
| 85 | |
| 86 | return NULL; |
| 87 | } |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 88 | EXPORT_SYMBOL_GPL(kvmppc_find_table); |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 89 | |
| 90 | /* |
Alexey Kardashevskiy | 5ee7af1 | 2016-02-15 12:55:08 +1100 | [diff] [blame] | 91 | * Validates TCE address. |
| 92 | * At the moment flags and page mask are validated. |
| 93 | * As the host kernel does not access those addresses (just puts them |
| 94 | * to the table and user space is supposed to process them), we can skip |
| 95 | * checking other things (such as TCE is a guest RAM address or the page |
| 96 | * was actually allocated). |
| 97 | * |
| 98 | * WARNING: This will be called in real-mode on HV KVM and virtual |
| 99 | * mode on PR KVM |
| 100 | */ |
| 101 | long kvmppc_tce_validate(struct kvmppc_spapr_tce_table *stt, unsigned long tce) |
| 102 | { |
Alexey Kardashevskiy | b1af23d | 2017-03-22 15:21:55 +1100 | [diff] [blame] | 103 | unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE); |
| 104 | enum dma_data_direction dir = iommu_tce_direction(tce); |
Alexey Kardashevskiy | 5ee7af1 | 2016-02-15 12:55:08 +1100 | [diff] [blame] | 105 | |
Alexey Kardashevskiy | b1af23d | 2017-03-22 15:21:55 +1100 | [diff] [blame] | 106 | /* Allow userspace to poison TCE table */ |
| 107 | if (dir == DMA_NONE) |
| 108 | return H_SUCCESS; |
| 109 | |
| 110 | if (iommu_tce_check_gpa(stt->page_shift, gpa)) |
Alexey Kardashevskiy | 5ee7af1 | 2016-02-15 12:55:08 +1100 | [diff] [blame] | 111 | return H_PARAMETER; |
| 112 | |
| 113 | return H_SUCCESS; |
| 114 | } |
| 115 | EXPORT_SYMBOL_GPL(kvmppc_tce_validate); |
| 116 | |
| 117 | /* Note on the use of page_address() in real mode, |
| 118 | * |
| 119 | * It is safe to use page_address() in real mode on ppc64 because |
| 120 | * page_address() is always defined as lowmem_page_address() |
| 121 | * which returns __va(PFN_PHYS(page_to_pfn(page))) which is arithmetic |
| 122 | * operation and does not access page struct. |
| 123 | * |
| 124 | * Theoretically page_address() could be defined different |
| 125 | * but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL |
| 126 | * would have to be enabled. |
| 127 | * WANT_PAGE_VIRTUAL is never enabled on ppc32/ppc64, |
| 128 | * HASHED_PAGE_VIRTUAL could be enabled for ppc32 only and only |
| 129 | * if CONFIG_HIGHMEM is defined. As CONFIG_SPARSEMEM_VMEMMAP |
| 130 | * is not expected to be enabled on ppc32, page_address() |
| 131 | * is safe for ppc32 as well. |
| 132 | * |
| 133 | * WARNING: This will be called in real-mode on HV KVM and virtual |
| 134 | * mode on PR KVM |
| 135 | */ |
| 136 | static u64 *kvmppc_page_address(struct page *page) |
| 137 | { |
| 138 | #if defined(HASHED_PAGE_VIRTUAL) || defined(WANT_PAGE_VIRTUAL) |
| 139 | #error TODO: fix to avoid page_address() here |
| 140 | #endif |
| 141 | return (u64 *) page_address(page); |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Handles TCE requests for emulated devices. |
| 146 | * Puts guest TCE values to the table and expects user space to convert them. |
| 147 | * Called in both real and virtual modes. |
| 148 | * Cannot fail so kvmppc_tce_validate must be called before it. |
| 149 | * |
| 150 | * WARNING: This will be called in real-mode on HV KVM and virtual |
| 151 | * mode on PR KVM |
| 152 | */ |
| 153 | void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, |
| 154 | unsigned long idx, unsigned long tce) |
| 155 | { |
| 156 | struct page *page; |
| 157 | u64 *tbl; |
| 158 | |
Alexey Kardashevskiy | 14f853f | 2016-03-01 17:54:39 +1100 | [diff] [blame] | 159 | idx -= stt->offset; |
Alexey Kardashevskiy | 5ee7af1 | 2016-02-15 12:55:08 +1100 | [diff] [blame] | 160 | page = stt->pages[idx / TCES_PER_PAGE]; |
| 161 | tbl = kvmppc_page_address(page); |
| 162 | |
| 163 | tbl[idx % TCES_PER_PAGE] = tce; |
| 164 | } |
| 165 | EXPORT_SYMBOL_GPL(kvmppc_tce_put); |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 166 | |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 167 | long kvmppc_gpa_to_ua(struct kvm *kvm, unsigned long gpa, |
| 168 | unsigned long *ua, unsigned long **prmap) |
| 169 | { |
| 170 | unsigned long gfn = gpa >> PAGE_SHIFT; |
| 171 | struct kvm_memory_slot *memslot; |
| 172 | |
| 173 | memslot = search_memslots(kvm_memslots(kvm), gfn); |
| 174 | if (!memslot) |
| 175 | return -EINVAL; |
| 176 | |
| 177 | *ua = __gfn_to_hva_memslot(memslot, gfn) | |
| 178 | (gpa & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE)); |
| 179 | |
| 180 | #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE |
| 181 | if (prmap) |
| 182 | *prmap = &memslot->arch.rmap[gfn - memslot->base_gfn]; |
| 183 | #endif |
| 184 | |
| 185 | return 0; |
| 186 | } |
| 187 | EXPORT_SYMBOL_GPL(kvmppc_gpa_to_ua); |
| 188 | |
| 189 | #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 190 | static void kvmppc_rm_clear_tce(struct iommu_table *tbl, unsigned long entry) |
| 191 | { |
| 192 | unsigned long hpa = 0; |
| 193 | enum dma_data_direction dir = DMA_NONE; |
| 194 | |
| 195 | iommu_tce_xchg_rm(tbl, entry, &hpa, &dir); |
| 196 | } |
| 197 | |
| 198 | static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm, |
| 199 | struct iommu_table *tbl, unsigned long entry) |
| 200 | { |
| 201 | struct mm_iommu_table_group_mem_t *mem = NULL; |
| 202 | const unsigned long pgsize = 1ULL << tbl->it_page_shift; |
Alexey Kardashevskiy | a68bd12 | 2018-07-04 16:13:49 +1000 | [diff] [blame^] | 203 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RM(tbl, entry); |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 204 | |
| 205 | if (!pua) |
| 206 | /* it_userspace allocation might be delayed */ |
| 207 | return H_TOO_HARD; |
| 208 | |
Alexey Kardashevskiy | 00a5c58 | 2018-07-04 16:13:46 +1000 | [diff] [blame] | 209 | mem = mm_iommu_lookup_rm(kvm->mm, be64_to_cpu(*pua), pgsize); |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 210 | if (!mem) |
| 211 | return H_TOO_HARD; |
| 212 | |
| 213 | mm_iommu_mapped_dec(mem); |
| 214 | |
Alexey Kardashevskiy | 00a5c58 | 2018-07-04 16:13:46 +1000 | [diff] [blame] | 215 | *pua = cpu_to_be64(0); |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 216 | |
| 217 | return H_SUCCESS; |
| 218 | } |
| 219 | |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 220 | static long kvmppc_rm_tce_iommu_do_unmap(struct kvm *kvm, |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 221 | struct iommu_table *tbl, unsigned long entry) |
| 222 | { |
| 223 | enum dma_data_direction dir = DMA_NONE; |
| 224 | unsigned long hpa = 0; |
| 225 | long ret; |
| 226 | |
| 227 | if (iommu_tce_xchg_rm(tbl, entry, &hpa, &dir)) |
| 228 | /* |
| 229 | * real mode xchg can fail if struct page crosses |
| 230 | * a page boundary |
| 231 | */ |
| 232 | return H_TOO_HARD; |
| 233 | |
| 234 | if (dir == DMA_NONE) |
| 235 | return H_SUCCESS; |
| 236 | |
| 237 | ret = kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry); |
| 238 | if (ret) |
| 239 | iommu_tce_xchg_rm(tbl, entry, &hpa, &dir); |
| 240 | |
| 241 | return ret; |
| 242 | } |
| 243 | |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 244 | static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm, |
| 245 | struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, |
| 246 | unsigned long entry) |
| 247 | { |
| 248 | unsigned long i, ret = H_SUCCESS; |
| 249 | unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); |
| 250 | unsigned long io_entry = entry * subpages; |
| 251 | |
| 252 | for (i = 0; i < subpages; ++i) { |
| 253 | ret = kvmppc_rm_tce_iommu_do_unmap(kvm, tbl, io_entry + i); |
| 254 | if (ret != H_SUCCESS) |
| 255 | break; |
| 256 | } |
| 257 | |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | static long kvmppc_rm_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl, |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 262 | unsigned long entry, unsigned long ua, |
| 263 | enum dma_data_direction dir) |
| 264 | { |
| 265 | long ret; |
| 266 | unsigned long hpa = 0; |
Alexey Kardashevskiy | a68bd12 | 2018-07-04 16:13:49 +1000 | [diff] [blame^] | 267 | __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RM(tbl, entry); |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 268 | struct mm_iommu_table_group_mem_t *mem; |
| 269 | |
| 270 | if (!pua) |
| 271 | /* it_userspace allocation might be delayed */ |
| 272 | return H_TOO_HARD; |
| 273 | |
| 274 | mem = mm_iommu_lookup_rm(kvm->mm, ua, 1ULL << tbl->it_page_shift); |
| 275 | if (!mem) |
| 276 | return H_TOO_HARD; |
| 277 | |
| 278 | if (WARN_ON_ONCE_RM(mm_iommu_ua_to_hpa_rm(mem, ua, &hpa))) |
| 279 | return H_HARDWARE; |
| 280 | |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 281 | if (WARN_ON_ONCE_RM(mm_iommu_mapped_inc(mem))) |
| 282 | return H_CLOSED; |
| 283 | |
| 284 | ret = iommu_tce_xchg_rm(tbl, entry, &hpa, &dir); |
| 285 | if (ret) { |
| 286 | mm_iommu_mapped_dec(mem); |
| 287 | /* |
| 288 | * real mode xchg can fail if struct page crosses |
| 289 | * a page boundary |
| 290 | */ |
| 291 | return H_TOO_HARD; |
| 292 | } |
| 293 | |
| 294 | if (dir != DMA_NONE) |
| 295 | kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry); |
| 296 | |
Alexey Kardashevskiy | 00a5c58 | 2018-07-04 16:13:46 +1000 | [diff] [blame] | 297 | *pua = cpu_to_be64(ua); |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 302 | static long kvmppc_rm_tce_iommu_map(struct kvm *kvm, |
| 303 | struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl, |
| 304 | unsigned long entry, unsigned long ua, |
| 305 | enum dma_data_direction dir) |
| 306 | { |
| 307 | unsigned long i, pgoff, ret = H_SUCCESS; |
| 308 | unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift); |
| 309 | unsigned long io_entry = entry * subpages; |
| 310 | |
| 311 | for (i = 0, pgoff = 0; i < subpages; |
| 312 | ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) { |
| 313 | |
| 314 | ret = kvmppc_rm_tce_iommu_do_map(kvm, tbl, |
| 315 | io_entry + i, ua + pgoff, dir); |
| 316 | if (ret != H_SUCCESS) |
| 317 | break; |
| 318 | } |
| 319 | |
| 320 | return ret; |
| 321 | } |
| 322 | |
Alexey Kardashevskiy | 31217db | 2016-03-18 13:50:42 +1100 | [diff] [blame] | 323 | long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn, |
| 324 | unsigned long ioba, unsigned long tce) |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 325 | { |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 326 | struct kvmppc_spapr_tce_table *stt; |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 327 | long ret; |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 328 | struct kvmppc_spapr_tce_iommu_table *stit; |
| 329 | unsigned long entry, ua = 0; |
| 330 | enum dma_data_direction dir; |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 331 | |
| 332 | /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */ |
| 333 | /* liobn, ioba, tce); */ |
| 334 | |
Paul Mackerras | acde257 | 2017-05-10 16:39:41 +1000 | [diff] [blame] | 335 | /* For radix, we might be in virtual mode, so punt */ |
| 336 | if (kvm_is_radix(vcpu->kvm)) |
| 337 | return H_TOO_HARD; |
| 338 | |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 339 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 340 | if (!stt) |
| 341 | return H_TOO_HARD; |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 342 | |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 343 | ret = kvmppc_ioba_validate(stt, ioba, 1); |
| 344 | if (ret != H_SUCCESS) |
| 345 | return ret; |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 346 | |
Alexey Kardashevskiy | 5ee7af1 | 2016-02-15 12:55:08 +1100 | [diff] [blame] | 347 | ret = kvmppc_tce_validate(stt, tce); |
| 348 | if (ret != H_SUCCESS) |
| 349 | return ret; |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 350 | |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 351 | dir = iommu_tce_direction(tce); |
| 352 | if ((dir != DMA_NONE) && kvmppc_gpa_to_ua(vcpu->kvm, |
| 353 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), &ua, NULL)) |
| 354 | return H_PARAMETER; |
| 355 | |
| 356 | entry = ioba >> stt->page_shift; |
| 357 | |
| 358 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { |
| 359 | if (dir == DMA_NONE) |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 360 | ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt, |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 361 | stit->tbl, entry); |
| 362 | else |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 363 | ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt, |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 364 | stit->tbl, entry, ua, dir); |
| 365 | |
| 366 | if (ret == H_SUCCESS) |
| 367 | continue; |
| 368 | |
| 369 | if (ret == H_TOO_HARD) |
| 370 | return ret; |
| 371 | |
| 372 | WARN_ON_ONCE_RM(1); |
| 373 | kvmppc_rm_clear_tce(stit->tbl, entry); |
| 374 | } |
| 375 | |
| 376 | kvmppc_tce_put(stt, entry, tce); |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 377 | |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 378 | return H_SUCCESS; |
David Gibson | 54738c0 | 2011-06-29 00:22:41 +0000 | [diff] [blame] | 379 | } |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 380 | |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 381 | static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu, |
| 382 | unsigned long ua, unsigned long *phpa) |
| 383 | { |
| 384 | pte_t *ptep, pte; |
| 385 | unsigned shift = 0; |
| 386 | |
Aneesh Kumar K.V | 94171b1 | 2017-07-27 11:54:53 +0530 | [diff] [blame] | 387 | /* |
| 388 | * Called in real mode with MSR_EE = 0. We are safe here. |
| 389 | * It is ok to do the lookup with arch.pgdir here, because |
| 390 | * we are doing this on secondary cpus and current task there |
| 391 | * is not the hypervisor. Also this is safe against THP in the |
| 392 | * host, because an IPI to primary thread will wait for the secondary |
| 393 | * to exit which will agains result in the below page table walk |
| 394 | * to finish. |
| 395 | */ |
| 396 | ptep = __find_linux_pte(vcpu->arch.pgdir, ua, NULL, &shift); |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 397 | if (!ptep || !pte_present(*ptep)) |
| 398 | return -ENXIO; |
| 399 | pte = *ptep; |
| 400 | |
| 401 | if (!shift) |
| 402 | shift = PAGE_SHIFT; |
| 403 | |
| 404 | /* Avoid handling anything potentially complicated in realmode */ |
| 405 | if (shift > PAGE_SHIFT) |
| 406 | return -EAGAIN; |
| 407 | |
| 408 | if (!pte_young(pte)) |
| 409 | return -EAGAIN; |
| 410 | |
| 411 | *phpa = (pte_pfn(pte) << PAGE_SHIFT) | (ua & ((1ULL << shift) - 1)) | |
| 412 | (ua & ~PAGE_MASK); |
| 413 | |
| 414 | return 0; |
| 415 | } |
| 416 | |
| 417 | long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu, |
| 418 | unsigned long liobn, unsigned long ioba, |
| 419 | unsigned long tce_list, unsigned long npages) |
| 420 | { |
| 421 | struct kvmppc_spapr_tce_table *stt; |
| 422 | long i, ret = H_SUCCESS; |
| 423 | unsigned long tces, entry, ua = 0; |
| 424 | unsigned long *rmap = NULL; |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 425 | bool prereg = false; |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 426 | struct kvmppc_spapr_tce_iommu_table *stit; |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 427 | |
Paul Mackerras | acde257 | 2017-05-10 16:39:41 +1000 | [diff] [blame] | 428 | /* For radix, we might be in virtual mode, so punt */ |
| 429 | if (kvm_is_radix(vcpu->kvm)) |
| 430 | return H_TOO_HARD; |
| 431 | |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 432 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 433 | if (!stt) |
| 434 | return H_TOO_HARD; |
| 435 | |
Alexey Kardashevskiy | fe26e52 | 2016-03-01 17:54:38 +1100 | [diff] [blame] | 436 | entry = ioba >> stt->page_shift; |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 437 | /* |
| 438 | * The spec says that the maximum size of the list is 512 TCEs |
| 439 | * so the whole table addressed resides in 4K page |
| 440 | */ |
| 441 | if (npages > 512) |
| 442 | return H_PARAMETER; |
| 443 | |
| 444 | if (tce_list & (SZ_4K - 1)) |
| 445 | return H_PARAMETER; |
| 446 | |
| 447 | ret = kvmppc_ioba_validate(stt, ioba, npages); |
| 448 | if (ret != H_SUCCESS) |
| 449 | return ret; |
| 450 | |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 451 | if (mm_iommu_preregistered(vcpu->kvm->mm)) { |
| 452 | /* |
| 453 | * We get here if guest memory was pre-registered which |
| 454 | * is normally VFIO case and gpa->hpa translation does not |
| 455 | * depend on hpt. |
| 456 | */ |
| 457 | struct mm_iommu_table_group_mem_t *mem; |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 458 | |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 459 | if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, NULL)) |
| 460 | return H_TOO_HARD; |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 461 | |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 462 | mem = mm_iommu_lookup_rm(vcpu->kvm->mm, ua, IOMMU_PAGE_SIZE_4K); |
| 463 | if (mem) |
| 464 | prereg = mm_iommu_ua_to_hpa_rm(mem, ua, &tces) == 0; |
| 465 | } |
| 466 | |
| 467 | if (!prereg) { |
| 468 | /* |
| 469 | * This is usually a case of a guest with emulated devices only |
| 470 | * when TCE list is not in preregistered memory. |
| 471 | * We do not require memory to be preregistered in this case |
| 472 | * so lock rmap and do __find_linux_pte_or_hugepte(). |
| 473 | */ |
| 474 | if (kvmppc_gpa_to_ua(vcpu->kvm, tce_list, &ua, &rmap)) |
| 475 | return H_TOO_HARD; |
| 476 | |
| 477 | rmap = (void *) vmalloc_to_phys(rmap); |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 478 | if (WARN_ON_ONCE_RM(!rmap)) |
| 479 | return H_HARDWARE; |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 480 | |
| 481 | /* |
| 482 | * Synchronize with the MMU notifier callbacks in |
Paul Mackerras | 39c983e | 2018-02-22 15:16:54 +1100 | [diff] [blame] | 483 | * book3s_64_mmu_hv.c (kvm_unmap_hva_range_hv etc.). |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 484 | * While we have the rmap lock, code running on other CPUs |
| 485 | * cannot finish unmapping the host real page that backs |
| 486 | * this guest real page, so we are OK to access the host |
| 487 | * real page. |
| 488 | */ |
| 489 | lock_rmap(rmap); |
| 490 | if (kvmppc_rm_ua_to_hpa(vcpu, ua, &tces)) { |
| 491 | ret = H_TOO_HARD; |
| 492 | goto unlock_exit; |
| 493 | } |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 494 | } |
| 495 | |
| 496 | for (i = 0; i < npages; ++i) { |
| 497 | unsigned long tce = be64_to_cpu(((u64 *)tces)[i]); |
| 498 | |
| 499 | ret = kvmppc_tce_validate(stt, tce); |
| 500 | if (ret != H_SUCCESS) |
| 501 | goto unlock_exit; |
| 502 | |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 503 | ua = 0; |
| 504 | if (kvmppc_gpa_to_ua(vcpu->kvm, |
| 505 | tce & ~(TCE_PCI_READ | TCE_PCI_WRITE), |
| 506 | &ua, NULL)) |
| 507 | return H_PARAMETER; |
| 508 | |
| 509 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 510 | ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt, |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 511 | stit->tbl, entry + i, ua, |
| 512 | iommu_tce_direction(tce)); |
| 513 | |
| 514 | if (ret == H_SUCCESS) |
| 515 | continue; |
| 516 | |
| 517 | if (ret == H_TOO_HARD) |
| 518 | goto unlock_exit; |
| 519 | |
| 520 | WARN_ON_ONCE_RM(1); |
| 521 | kvmppc_rm_clear_tce(stit->tbl, entry); |
| 522 | } |
| 523 | |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 524 | kvmppc_tce_put(stt, entry + i, tce); |
| 525 | } |
| 526 | |
| 527 | unlock_exit: |
Alexey Kardashevskiy | da6f59e | 2017-03-22 15:21:54 +1100 | [diff] [blame] | 528 | if (rmap) |
| 529 | unlock_rmap(rmap); |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 530 | |
| 531 | return ret; |
| 532 | } |
| 533 | |
Alexey Kardashevskiy | 31217db | 2016-03-18 13:50:42 +1100 | [diff] [blame] | 534 | long kvmppc_rm_h_stuff_tce(struct kvm_vcpu *vcpu, |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 535 | unsigned long liobn, unsigned long ioba, |
| 536 | unsigned long tce_value, unsigned long npages) |
| 537 | { |
| 538 | struct kvmppc_spapr_tce_table *stt; |
| 539 | long i, ret; |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 540 | struct kvmppc_spapr_tce_iommu_table *stit; |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 541 | |
Paul Mackerras | acde257 | 2017-05-10 16:39:41 +1000 | [diff] [blame] | 542 | /* For radix, we might be in virtual mode, so punt */ |
| 543 | if (kvm_is_radix(vcpu->kvm)) |
| 544 | return H_TOO_HARD; |
| 545 | |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 546 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 547 | if (!stt) |
| 548 | return H_TOO_HARD; |
| 549 | |
| 550 | ret = kvmppc_ioba_validate(stt, ioba, npages); |
| 551 | if (ret != H_SUCCESS) |
| 552 | return ret; |
| 553 | |
| 554 | /* Check permission bits only to allow userspace poison TCE for debug */ |
| 555 | if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ)) |
| 556 | return H_PARAMETER; |
| 557 | |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 558 | list_for_each_entry_lockless(stit, &stt->iommu_tables, next) { |
Alexey Kardashevskiy | c6b6166 | 2018-05-14 20:00:27 +1000 | [diff] [blame] | 559 | unsigned long entry = ioba >> stt->page_shift; |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 560 | |
| 561 | for (i = 0; i < npages; ++i) { |
Alexey Kardashevskiy | ca1fc48 | 2018-05-14 20:00:28 +1000 | [diff] [blame] | 562 | ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt, |
Alexey Kardashevskiy | 121f80b | 2017-03-22 15:21:56 +1100 | [diff] [blame] | 563 | stit->tbl, entry + i); |
| 564 | |
| 565 | if (ret == H_SUCCESS) |
| 566 | continue; |
| 567 | |
| 568 | if (ret == H_TOO_HARD) |
| 569 | return ret; |
| 570 | |
| 571 | WARN_ON_ONCE_RM(1); |
| 572 | kvmppc_rm_clear_tce(stit->tbl, entry); |
| 573 | } |
| 574 | } |
| 575 | |
Alexey Kardashevskiy | fe26e52 | 2016-03-01 17:54:38 +1100 | [diff] [blame] | 576 | for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift)) |
| 577 | kvmppc_tce_put(stt, ioba >> stt->page_shift, tce_value); |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 578 | |
| 579 | return H_SUCCESS; |
| 580 | } |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 581 | |
Paul Mackerras | acde257 | 2017-05-10 16:39:41 +1000 | [diff] [blame] | 582 | /* This can be called in either virtual mode or real mode */ |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 583 | long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn, |
| 584 | unsigned long ioba) |
| 585 | { |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 586 | struct kvmppc_spapr_tce_table *stt; |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 587 | long ret; |
| 588 | unsigned long idx; |
| 589 | struct page *page; |
| 590 | u64 *tbl; |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 591 | |
Alexey Kardashevskiy | 503bfcb | 2017-03-22 15:21:53 +1100 | [diff] [blame] | 592 | stt = kvmppc_find_table(vcpu->kvm, liobn); |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 593 | if (!stt) |
| 594 | return H_TOO_HARD; |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 595 | |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 596 | ret = kvmppc_ioba_validate(stt, ioba, 1); |
| 597 | if (ret != H_SUCCESS) |
| 598 | return ret; |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 599 | |
Alexey Kardashevskiy | 14f853f | 2016-03-01 17:54:39 +1100 | [diff] [blame] | 600 | idx = (ioba >> stt->page_shift) - stt->offset; |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 601 | page = stt->pages[idx / TCES_PER_PAGE]; |
| 602 | tbl = (u64 *)page_address(page); |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 603 | |
Simon Guo | 1143a70 | 2018-05-07 14:20:07 +0800 | [diff] [blame] | 604 | vcpu->arch.regs.gpr[4] = tbl[idx % TCES_PER_PAGE]; |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 605 | |
Alexey Kardashevskiy | fcbb2ce | 2016-02-15 12:55:04 +1100 | [diff] [blame] | 606 | return H_SUCCESS; |
Laurent Dufour | 69e9fbb2 | 2014-02-21 16:31:10 +0100 | [diff] [blame] | 607 | } |
| 608 | EXPORT_SYMBOL_GPL(kvmppc_h_get_tce); |
Alexey Kardashevskiy | d3695aa | 2016-02-15 12:55:09 +1100 | [diff] [blame] | 609 | |
| 610 | #endif /* KVM_BOOK3S_HV_POSSIBLE */ |