Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 1 | /* |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * KVM/MIPS TLB handling, this file is part of the Linux host kernel so that |
| 7 | * TLB handlers run from KSEG0 |
| 8 | * |
| 9 | * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. |
| 10 | * Authors: Sanjay Lal <sanjayl@kymasys.com> |
| 11 | */ |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 12 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 13 | #include <linux/sched.h> |
| 14 | #include <linux/smp.h> |
| 15 | #include <linux/mm.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/kvm_host.h> |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 19 | #include <linux/srcu.h> |
| 20 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 21 | #include <asm/cpu.h> |
| 22 | #include <asm/bootinfo.h> |
| 23 | #include <asm/mmu_context.h> |
| 24 | #include <asm/pgtable.h> |
| 25 | #include <asm/cacheflush.h> |
James Hogan | e36059e | 2014-01-17 12:01:30 +0000 | [diff] [blame] | 26 | #include <asm/tlb.h> |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 27 | |
| 28 | #undef CONFIG_MIPS_MT |
| 29 | #include <asm/r4kcache.h> |
| 30 | #define CONFIG_MIPS_MT |
| 31 | |
| 32 | #define KVM_GUEST_PC_TLB 0 |
| 33 | #define KVM_GUEST_SP_TLB 1 |
| 34 | |
| 35 | #define PRIx64 "llx" |
| 36 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 37 | atomic_t kvm_mips_instance; |
| 38 | EXPORT_SYMBOL(kvm_mips_instance); |
| 39 | |
| 40 | /* These function pointers are initialized once the KVM module is loaded */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 41 | pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 42 | EXPORT_SYMBOL(kvm_mips_gfn_to_pfn); |
| 43 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 44 | void (*kvm_mips_release_pfn_clean)(pfn_t pfn); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 45 | EXPORT_SYMBOL(kvm_mips_release_pfn_clean); |
| 46 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 47 | bool (*kvm_mips_is_error_pfn)(pfn_t pfn); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 48 | EXPORT_SYMBOL(kvm_mips_is_error_pfn); |
| 49 | |
| 50 | uint32_t kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) |
| 51 | { |
David Daney | 48c4ac9 | 2013-05-13 13:56:44 -0700 | [diff] [blame] | 52 | return vcpu->arch.guest_kernel_asid[smp_processor_id()] & ASID_MASK; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 53 | } |
| 54 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 55 | uint32_t kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) |
| 56 | { |
David Daney | 48c4ac9 | 2013-05-13 13:56:44 -0700 | [diff] [blame] | 57 | return vcpu->arch.guest_user_asid[smp_processor_id()] & ASID_MASK; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 58 | } |
| 59 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 60 | inline uint32_t kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 61 | { |
| 62 | return vcpu->kvm->arch.commpage_tlb; |
| 63 | } |
| 64 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 65 | /* Structure defining an tlb entry data set. */ |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 66 | |
| 67 | void kvm_mips_dump_host_tlbs(void) |
| 68 | { |
| 69 | unsigned long old_entryhi; |
| 70 | unsigned long old_pagemask; |
| 71 | struct kvm_mips_tlb tlb; |
| 72 | unsigned long flags; |
| 73 | int i; |
| 74 | |
| 75 | local_irq_save(flags); |
| 76 | |
| 77 | old_entryhi = read_c0_entryhi(); |
| 78 | old_pagemask = read_c0_pagemask(); |
| 79 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 80 | kvm_info("HOST TLBs:\n"); |
| 81 | kvm_info("ASID: %#lx\n", read_c0_entryhi() & ASID_MASK); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 82 | |
| 83 | for (i = 0; i < current_cpu_data.tlbsize; i++) { |
| 84 | write_c0_index(i); |
| 85 | mtc0_tlbw_hazard(); |
| 86 | |
| 87 | tlb_read(); |
| 88 | tlbw_use_hazard(); |
| 89 | |
| 90 | tlb.tlb_hi = read_c0_entryhi(); |
| 91 | tlb.tlb_lo0 = read_c0_entrylo0(); |
| 92 | tlb.tlb_lo1 = read_c0_entrylo1(); |
| 93 | tlb.tlb_mask = read_c0_pagemask(); |
| 94 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 95 | kvm_info("TLB%c%3d Hi 0x%08lx ", |
| 96 | (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| 97 | i, tlb.tlb_hi); |
| 98 | kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", |
| 99 | (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
| 100 | (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| 101 | (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| 102 | (tlb.tlb_lo0 >> 3) & 7); |
| 103 | kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", |
| 104 | (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
| 105 | (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| 106 | (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| 107 | (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 108 | } |
| 109 | write_c0_entryhi(old_entryhi); |
| 110 | write_c0_pagemask(old_pagemask); |
| 111 | mtc0_tlbw_hazard(); |
| 112 | local_irq_restore(flags); |
| 113 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 114 | EXPORT_SYMBOL(kvm_mips_dump_host_tlbs); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 115 | |
| 116 | void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) |
| 117 | { |
| 118 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
| 119 | struct kvm_mips_tlb tlb; |
| 120 | int i; |
| 121 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 122 | kvm_info("Guest TLBs:\n"); |
| 123 | kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 124 | |
| 125 | for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
| 126 | tlb = vcpu->arch.guest_tlb[i]; |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 127 | kvm_info("TLB%c%3d Hi 0x%08lx ", |
| 128 | (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| 129 | i, tlb.tlb_hi); |
| 130 | kvm_info("Lo0=0x%09" PRIx64 " %c%c attr %lx ", |
| 131 | (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
| 132 | (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| 133 | (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| 134 | (tlb.tlb_lo0 >> 3) & 7); |
| 135 | kvm_info("Lo1=0x%09" PRIx64 " %c%c attr %lx sz=%lx\n", |
| 136 | (uint64_t) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
| 137 | (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| 138 | (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| 139 | (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 140 | } |
| 141 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 142 | EXPORT_SYMBOL(kvm_mips_dump_guest_tlbs); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 143 | |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 144 | static int kvm_mips_map_page(struct kvm *kvm, gfn_t gfn) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 145 | { |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 146 | int srcu_idx, err = 0; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 147 | pfn_t pfn; |
| 148 | |
| 149 | if (kvm->arch.guest_pmap[gfn] != KVM_INVALID_PAGE) |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 150 | return 0; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 151 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 152 | srcu_idx = srcu_read_lock(&kvm->srcu); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 153 | pfn = kvm_mips_gfn_to_pfn(kvm, gfn); |
| 154 | |
| 155 | if (kvm_mips_is_error_pfn(pfn)) { |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 156 | kvm_err("Couldn't get pfn for gfn %#" PRIx64 "!\n", gfn); |
| 157 | err = -EFAULT; |
| 158 | goto out; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | kvm->arch.guest_pmap[gfn] = pfn; |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 162 | out: |
| 163 | srcu_read_unlock(&kvm->srcu, srcu_idx); |
| 164 | return err; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | /* Translate guest KSEG0 addresses to Host PA */ |
| 168 | unsigned long kvm_mips_translate_guest_kseg0_to_hpa(struct kvm_vcpu *vcpu, |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 169 | unsigned long gva) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 170 | { |
| 171 | gfn_t gfn; |
| 172 | uint32_t offset = gva & ~PAGE_MASK; |
| 173 | struct kvm *kvm = vcpu->kvm; |
| 174 | |
| 175 | if (KVM_GUEST_KSEGX(gva) != KVM_GUEST_KSEG0) { |
| 176 | kvm_err("%s/%p: Invalid gva: %#lx\n", __func__, |
| 177 | __builtin_return_address(0), gva); |
| 178 | return KVM_INVALID_PAGE; |
| 179 | } |
| 180 | |
| 181 | gfn = (KVM_GUEST_CPHYSADDR(gva) >> PAGE_SHIFT); |
| 182 | |
| 183 | if (gfn >= kvm->arch.guest_pmap_npages) { |
| 184 | kvm_err("%s: Invalid gfn: %#llx, GVA: %#lx\n", __func__, gfn, |
| 185 | gva); |
| 186 | return KVM_INVALID_PAGE; |
| 187 | } |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 188 | |
| 189 | if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) |
| 190 | return KVM_INVALID_ADDR; |
| 191 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 192 | return (kvm->arch.guest_pmap[gfn] << PAGE_SHIFT) + offset; |
| 193 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 194 | EXPORT_SYMBOL(kvm_mips_translate_guest_kseg0_to_hpa); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 195 | |
| 196 | /* XXXKYMA: Must be called with interrupts disabled */ |
| 197 | /* set flush_dcache_mask == 0 if no dcache flush required */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 198 | int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, |
| 199 | unsigned long entrylo0, unsigned long entrylo1, |
| 200 | int flush_dcache_mask) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 201 | { |
| 202 | unsigned long flags; |
| 203 | unsigned long old_entryhi; |
Deng-Cheng Zhu | b045c40 | 2014-06-26 12:11:37 -0700 | [diff] [blame] | 204 | int idx; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 205 | |
| 206 | local_irq_save(flags); |
| 207 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 208 | old_entryhi = read_c0_entryhi(); |
| 209 | write_c0_entryhi(entryhi); |
| 210 | mtc0_tlbw_hazard(); |
| 211 | |
| 212 | tlb_probe(); |
| 213 | tlb_probe_hazard(); |
| 214 | idx = read_c0_index(); |
| 215 | |
| 216 | if (idx > current_cpu_data.tlbsize) { |
| 217 | kvm_err("%s: Invalid Index: %d\n", __func__, idx); |
| 218 | kvm_mips_dump_host_tlbs(); |
Tapasweni Pathak | cfec0e7 | 2015-02-22 21:48:21 +0530 | [diff] [blame] | 219 | local_irq_restore(flags); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 220 | return -1; |
| 221 | } |
| 222 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 223 | write_c0_entrylo0(entrylo0); |
| 224 | write_c0_entrylo1(entrylo1); |
| 225 | mtc0_tlbw_hazard(); |
| 226 | |
James Hogan | b5dfc6c | 2014-05-29 10:16:26 +0100 | [diff] [blame] | 227 | if (idx < 0) |
| 228 | tlb_write_random(); |
| 229 | else |
| 230 | tlb_write_indexed(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 231 | tlbw_use_hazard(); |
| 232 | |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 233 | kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| 234 | vcpu->arch.pc, idx, read_c0_entryhi(), |
| 235 | read_c0_entrylo0(), read_c0_entrylo1()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 236 | |
| 237 | /* Flush D-cache */ |
| 238 | if (flush_dcache_mask) { |
| 239 | if (entrylo0 & MIPS3_PG_V) { |
| 240 | ++vcpu->stat.flush_dcache_exits; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 241 | flush_data_cache_page((entryhi & VPN2_MASK) & |
| 242 | ~flush_dcache_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 243 | } |
| 244 | if (entrylo1 & MIPS3_PG_V) { |
| 245 | ++vcpu->stat.flush_dcache_exits; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 246 | flush_data_cache_page(((entryhi & VPN2_MASK) & |
| 247 | ~flush_dcache_mask) | |
| 248 | (0x1 << PAGE_SHIFT)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 249 | } |
| 250 | } |
| 251 | |
| 252 | /* Restore old ASID */ |
| 253 | write_c0_entryhi(old_entryhi); |
| 254 | mtc0_tlbw_hazard(); |
| 255 | tlbw_use_hazard(); |
| 256 | local_irq_restore(flags); |
| 257 | return 0; |
| 258 | } |
| 259 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 260 | /* XXXKYMA: Must be called with interrupts disabled */ |
| 261 | int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr, |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 262 | struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 263 | { |
| 264 | gfn_t gfn; |
| 265 | pfn_t pfn0, pfn1; |
| 266 | unsigned long vaddr = 0; |
| 267 | unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; |
| 268 | int even; |
| 269 | struct kvm *kvm = vcpu->kvm; |
| 270 | const int flush_dcache_mask = 0; |
| 271 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 272 | if (KVM_GUEST_KSEGX(badvaddr) != KVM_GUEST_KSEG0) { |
| 273 | kvm_err("%s: Invalid BadVaddr: %#lx\n", __func__, badvaddr); |
| 274 | kvm_mips_dump_host_tlbs(); |
| 275 | return -1; |
| 276 | } |
| 277 | |
| 278 | gfn = (KVM_GUEST_CPHYSADDR(badvaddr) >> PAGE_SHIFT); |
| 279 | if (gfn >= kvm->arch.guest_pmap_npages) { |
| 280 | kvm_err("%s: Invalid gfn: %#llx, BadVaddr: %#lx\n", __func__, |
| 281 | gfn, badvaddr); |
| 282 | kvm_mips_dump_host_tlbs(); |
| 283 | return -1; |
| 284 | } |
| 285 | even = !(gfn & 0x1); |
| 286 | vaddr = badvaddr & (PAGE_MASK << 1); |
| 287 | |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 288 | if (kvm_mips_map_page(vcpu->kvm, gfn) < 0) |
| 289 | return -1; |
| 290 | |
| 291 | if (kvm_mips_map_page(vcpu->kvm, gfn ^ 0x1) < 0) |
| 292 | return -1; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 293 | |
| 294 | if (even) { |
| 295 | pfn0 = kvm->arch.guest_pmap[gfn]; |
| 296 | pfn1 = kvm->arch.guest_pmap[gfn ^ 0x1]; |
| 297 | } else { |
| 298 | pfn0 = kvm->arch.guest_pmap[gfn ^ 0x1]; |
| 299 | pfn1 = kvm->arch.guest_pmap[gfn]; |
| 300 | } |
| 301 | |
| 302 | entryhi = (vaddr | kvm_mips_get_kernel_asid(vcpu)); |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 303 | entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| 304 | (1 << 2) | (0x1 << 1); |
| 305 | entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | |
| 306 | (1 << 2) | (0x1 << 1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 307 | |
| 308 | return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, |
| 309 | flush_dcache_mask); |
| 310 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 311 | EXPORT_SYMBOL(kvm_mips_handle_kseg0_tlb_fault); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 312 | |
| 313 | int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, |
| 314 | struct kvm_vcpu *vcpu) |
| 315 | { |
| 316 | pfn_t pfn0, pfn1; |
| 317 | unsigned long flags, old_entryhi = 0, vaddr = 0; |
| 318 | unsigned long entrylo0 = 0, entrylo1 = 0; |
| 319 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 320 | pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; |
| 321 | pfn1 = 0; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 322 | entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| 323 | (1 << 2) | (0x1 << 1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 324 | entrylo1 = 0; |
| 325 | |
| 326 | local_irq_save(flags); |
| 327 | |
| 328 | old_entryhi = read_c0_entryhi(); |
| 329 | vaddr = badvaddr & (PAGE_MASK << 1); |
| 330 | write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); |
| 331 | mtc0_tlbw_hazard(); |
| 332 | write_c0_entrylo0(entrylo0); |
| 333 | mtc0_tlbw_hazard(); |
| 334 | write_c0_entrylo1(entrylo1); |
| 335 | mtc0_tlbw_hazard(); |
| 336 | write_c0_index(kvm_mips_get_commpage_asid(vcpu)); |
| 337 | mtc0_tlbw_hazard(); |
| 338 | tlb_write_indexed(); |
| 339 | mtc0_tlbw_hazard(); |
| 340 | tlbw_use_hazard(); |
| 341 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 342 | kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| 343 | vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), |
| 344 | read_c0_entrylo0(), read_c0_entrylo1()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 345 | |
| 346 | /* Restore old ASID */ |
| 347 | write_c0_entryhi(old_entryhi); |
| 348 | mtc0_tlbw_hazard(); |
| 349 | tlbw_use_hazard(); |
| 350 | local_irq_restore(flags); |
| 351 | |
| 352 | return 0; |
| 353 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 354 | EXPORT_SYMBOL(kvm_mips_handle_commpage_tlb_fault); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 355 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 356 | int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu, |
| 357 | struct kvm_mips_tlb *tlb, |
| 358 | unsigned long *hpa0, |
| 359 | unsigned long *hpa1) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 360 | { |
| 361 | unsigned long entryhi = 0, entrylo0 = 0, entrylo1 = 0; |
| 362 | struct kvm *kvm = vcpu->kvm; |
| 363 | pfn_t pfn0, pfn1; |
| 364 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 365 | if ((tlb->tlb_hi & VPN2_MASK) == 0) { |
| 366 | pfn0 = 0; |
| 367 | pfn1 = 0; |
| 368 | } else { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 369 | if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo0) |
| 370 | >> PAGE_SHIFT) < 0) |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 371 | return -1; |
| 372 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 373 | if (kvm_mips_map_page(kvm, mips3_tlbpfn_to_paddr(tlb->tlb_lo1) |
| 374 | >> PAGE_SHIFT) < 0) |
Sanjay Lal | 6d17c0d | 2013-05-18 06:54:24 -0700 | [diff] [blame] | 375 | return -1; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 376 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 377 | pfn0 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo0) |
| 378 | >> PAGE_SHIFT]; |
| 379 | pfn1 = kvm->arch.guest_pmap[mips3_tlbpfn_to_paddr(tlb->tlb_lo1) |
| 380 | >> PAGE_SHIFT]; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | if (hpa0) |
| 384 | *hpa0 = pfn0 << PAGE_SHIFT; |
| 385 | |
| 386 | if (hpa1) |
| 387 | *hpa1 = pfn1 << PAGE_SHIFT; |
| 388 | |
| 389 | /* Get attributes from the Guest TLB */ |
| 390 | entryhi = (tlb->tlb_hi & VPN2_MASK) | (KVM_GUEST_KERNEL_MODE(vcpu) ? |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 391 | kvm_mips_get_kernel_asid(vcpu) : |
| 392 | kvm_mips_get_user_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 393 | entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 394 | (tlb->tlb_lo0 & MIPS3_PG_D) | (tlb->tlb_lo0 & MIPS3_PG_V); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 395 | entrylo1 = mips3_paddr_to_tlbpfn(pfn1 << PAGE_SHIFT) | (0x3 << 3) | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 396 | (tlb->tlb_lo1 & MIPS3_PG_D) | (tlb->tlb_lo1 & MIPS3_PG_V); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 397 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 398 | kvm_debug("@ %#lx tlb_lo0: 0x%08lx tlb_lo1: 0x%08lx\n", vcpu->arch.pc, |
| 399 | tlb->tlb_lo0, tlb->tlb_lo1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 400 | |
| 401 | return kvm_mips_host_tlb_write(vcpu, entryhi, entrylo0, entrylo1, |
| 402 | tlb->tlb_mask); |
| 403 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 404 | EXPORT_SYMBOL(kvm_mips_handle_mapped_seg_tlb_fault); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 405 | |
| 406 | int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) |
| 407 | { |
| 408 | int i; |
| 409 | int index = -1; |
| 410 | struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; |
| 411 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 412 | for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 413 | if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && |
| 414 | TLB_HI_ASID_HIT(tlb[i], entryhi)) { |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 415 | index = i; |
| 416 | break; |
| 417 | } |
| 418 | } |
| 419 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 420 | kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n", |
| 421 | __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 422 | |
| 423 | return index; |
| 424 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 425 | EXPORT_SYMBOL(kvm_mips_guest_tlb_lookup); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 426 | |
| 427 | int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) |
| 428 | { |
| 429 | unsigned long old_entryhi, flags; |
Deng-Cheng Zhu | b045c40 | 2014-06-26 12:11:37 -0700 | [diff] [blame] | 430 | int idx; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 431 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 432 | local_irq_save(flags); |
| 433 | |
| 434 | old_entryhi = read_c0_entryhi(); |
| 435 | |
| 436 | if (KVM_GUEST_KERNEL_MODE(vcpu)) |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 437 | write_c0_entryhi((vaddr & VPN2_MASK) | |
| 438 | kvm_mips_get_kernel_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 439 | else { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 440 | write_c0_entryhi((vaddr & VPN2_MASK) | |
| 441 | kvm_mips_get_user_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | mtc0_tlbw_hazard(); |
| 445 | |
| 446 | tlb_probe(); |
| 447 | tlb_probe_hazard(); |
| 448 | idx = read_c0_index(); |
| 449 | |
| 450 | /* Restore old ASID */ |
| 451 | write_c0_entryhi(old_entryhi); |
| 452 | mtc0_tlbw_hazard(); |
| 453 | tlbw_use_hazard(); |
| 454 | |
| 455 | local_irq_restore(flags); |
| 456 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 457 | kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 458 | |
| 459 | return idx; |
| 460 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 461 | EXPORT_SYMBOL(kvm_mips_host_tlb_lookup); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 462 | |
| 463 | int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) |
| 464 | { |
| 465 | int idx; |
| 466 | unsigned long flags, old_entryhi; |
| 467 | |
| 468 | local_irq_save(flags); |
| 469 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 470 | old_entryhi = read_c0_entryhi(); |
| 471 | |
| 472 | write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); |
| 473 | mtc0_tlbw_hazard(); |
| 474 | |
| 475 | tlb_probe(); |
| 476 | tlb_probe_hazard(); |
| 477 | idx = read_c0_index(); |
| 478 | |
| 479 | if (idx >= current_cpu_data.tlbsize) |
| 480 | BUG(); |
| 481 | |
| 482 | if (idx > 0) { |
| 483 | write_c0_entryhi(UNIQUE_ENTRYHI(idx)); |
| 484 | mtc0_tlbw_hazard(); |
| 485 | |
| 486 | write_c0_entrylo0(0); |
| 487 | mtc0_tlbw_hazard(); |
| 488 | |
| 489 | write_c0_entrylo1(0); |
| 490 | mtc0_tlbw_hazard(); |
| 491 | |
| 492 | tlb_write_indexed(); |
| 493 | mtc0_tlbw_hazard(); |
| 494 | } |
| 495 | |
| 496 | write_c0_entryhi(old_entryhi); |
| 497 | mtc0_tlbw_hazard(); |
| 498 | tlbw_use_hazard(); |
| 499 | |
| 500 | local_irq_restore(flags); |
| 501 | |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 502 | if (idx > 0) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 503 | kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__, |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 504 | (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 505 | |
| 506 | return 0; |
| 507 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 508 | EXPORT_SYMBOL(kvm_mips_host_tlb_inv); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 509 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 510 | /* XXXKYMA: Fix Guest USER/KERNEL no longer share the same ASID */ |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 511 | int kvm_mips_host_tlb_inv_index(struct kvm_vcpu *vcpu, int index) |
| 512 | { |
| 513 | unsigned long flags, old_entryhi; |
| 514 | |
| 515 | if (index >= current_cpu_data.tlbsize) |
| 516 | BUG(); |
| 517 | |
| 518 | local_irq_save(flags); |
| 519 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 520 | old_entryhi = read_c0_entryhi(); |
| 521 | |
| 522 | write_c0_entryhi(UNIQUE_ENTRYHI(index)); |
| 523 | mtc0_tlbw_hazard(); |
| 524 | |
| 525 | write_c0_index(index); |
| 526 | mtc0_tlbw_hazard(); |
| 527 | |
| 528 | write_c0_entrylo0(0); |
| 529 | mtc0_tlbw_hazard(); |
| 530 | |
| 531 | write_c0_entrylo1(0); |
| 532 | mtc0_tlbw_hazard(); |
| 533 | |
| 534 | tlb_write_indexed(); |
| 535 | mtc0_tlbw_hazard(); |
| 536 | tlbw_use_hazard(); |
| 537 | |
| 538 | write_c0_entryhi(old_entryhi); |
| 539 | mtc0_tlbw_hazard(); |
| 540 | tlbw_use_hazard(); |
| 541 | |
| 542 | local_irq_restore(flags); |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | void kvm_mips_flush_host_tlb(int skip_kseg0) |
| 548 | { |
| 549 | unsigned long flags; |
| 550 | unsigned long old_entryhi, entryhi; |
| 551 | unsigned long old_pagemask; |
| 552 | int entry = 0; |
| 553 | int maxentry = current_cpu_data.tlbsize; |
| 554 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 555 | local_irq_save(flags); |
| 556 | |
| 557 | old_entryhi = read_c0_entryhi(); |
| 558 | old_pagemask = read_c0_pagemask(); |
| 559 | |
| 560 | /* Blast 'em all away. */ |
| 561 | for (entry = 0; entry < maxentry; entry++) { |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 562 | write_c0_index(entry); |
| 563 | mtc0_tlbw_hazard(); |
| 564 | |
| 565 | if (skip_kseg0) { |
| 566 | tlb_read(); |
| 567 | tlbw_use_hazard(); |
| 568 | |
| 569 | entryhi = read_c0_entryhi(); |
| 570 | |
| 571 | /* Don't blow away guest kernel entries */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 572 | if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 573 | continue; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | /* Make sure all entries differ. */ |
| 577 | write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| 578 | mtc0_tlbw_hazard(); |
| 579 | write_c0_entrylo0(0); |
| 580 | mtc0_tlbw_hazard(); |
| 581 | write_c0_entrylo1(0); |
| 582 | mtc0_tlbw_hazard(); |
| 583 | |
| 584 | tlb_write_indexed(); |
| 585 | mtc0_tlbw_hazard(); |
| 586 | } |
| 587 | |
| 588 | tlbw_use_hazard(); |
| 589 | |
| 590 | write_c0_entryhi(old_entryhi); |
| 591 | write_c0_pagemask(old_pagemask); |
| 592 | mtc0_tlbw_hazard(); |
| 593 | tlbw_use_hazard(); |
| 594 | |
| 595 | local_irq_restore(flags); |
| 596 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 597 | EXPORT_SYMBOL(kvm_mips_flush_host_tlb); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 598 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 599 | void kvm_get_new_mmu_context(struct mm_struct *mm, unsigned long cpu, |
| 600 | struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 601 | { |
| 602 | unsigned long asid = asid_cache(cpu); |
| 603 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 604 | asid += ASID_INC; |
| 605 | if (!(asid & ASID_MASK)) { |
| 606 | if (cpu_has_vtag_icache) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 607 | flush_icache_all(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 608 | |
| 609 | kvm_local_flush_tlb_all(); /* start new asid cycle */ |
| 610 | |
| 611 | if (!asid) /* fix version if needed */ |
| 612 | asid = ASID_FIRST_VERSION; |
| 613 | } |
| 614 | |
| 615 | cpu_context(cpu, mm) = asid_cache(cpu) = asid; |
| 616 | } |
| 617 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 618 | void kvm_local_flush_tlb_all(void) |
| 619 | { |
| 620 | unsigned long flags; |
| 621 | unsigned long old_ctx; |
| 622 | int entry = 0; |
| 623 | |
| 624 | local_irq_save(flags); |
| 625 | /* Save old context and create impossible VPN2 value */ |
| 626 | old_ctx = read_c0_entryhi(); |
| 627 | write_c0_entrylo0(0); |
| 628 | write_c0_entrylo1(0); |
| 629 | |
| 630 | /* Blast 'em all away. */ |
| 631 | while (entry < current_cpu_data.tlbsize) { |
| 632 | /* Make sure all entries differ. */ |
| 633 | write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| 634 | write_c0_index(entry); |
| 635 | mtc0_tlbw_hazard(); |
| 636 | tlb_write_indexed(); |
| 637 | entry++; |
| 638 | } |
| 639 | tlbw_use_hazard(); |
| 640 | write_c0_entryhi(old_ctx); |
| 641 | mtc0_tlbw_hazard(); |
| 642 | |
| 643 | local_irq_restore(flags); |
| 644 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 645 | EXPORT_SYMBOL(kvm_local_flush_tlb_all); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 646 | |
James Hogan | 3a0ba77 | 2014-05-29 10:16:34 +0100 | [diff] [blame] | 647 | /** |
| 648 | * kvm_mips_migrate_count() - Migrate timer. |
| 649 | * @vcpu: Virtual CPU. |
| 650 | * |
| 651 | * Migrate CP0_Count hrtimer to the current CPU by cancelling and restarting it |
| 652 | * if it was running prior to being cancelled. |
| 653 | * |
| 654 | * Must be called when the VCPU is migrated to a different CPU to ensure that |
| 655 | * timer expiry during guest execution interrupts the guest and causes the |
| 656 | * interrupt to be delivered in a timely manner. |
| 657 | */ |
| 658 | static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu) |
| 659 | { |
| 660 | if (hrtimer_cancel(&vcpu->arch.comparecount_timer)) |
| 661 | hrtimer_restart(&vcpu->arch.comparecount_timer); |
| 662 | } |
| 663 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 664 | /* Restore ASID once we are scheduled back after preemption */ |
| 665 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
| 666 | { |
| 667 | unsigned long flags; |
| 668 | int newasid = 0; |
| 669 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 670 | kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 671 | |
| 672 | /* Alocate new kernel and user ASIDs if needed */ |
| 673 | |
| 674 | local_irq_save(flags); |
| 675 | |
| 676 | if (((vcpu->arch. |
| 677 | guest_kernel_asid[cpu] ^ asid_cache(cpu)) & ASID_VERSION_MASK)) { |
| 678 | kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); |
| 679 | vcpu->arch.guest_kernel_asid[cpu] = |
| 680 | vcpu->arch.guest_kernel_mm.context.asid[cpu]; |
| 681 | kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); |
| 682 | vcpu->arch.guest_user_asid[cpu] = |
| 683 | vcpu->arch.guest_user_mm.context.asid[cpu]; |
| 684 | newasid++; |
| 685 | |
James Hogan | 6e95bfd | 2014-05-29 10:16:43 +0100 | [diff] [blame] | 686 | kvm_debug("[%d]: cpu_context: %#lx\n", cpu, |
| 687 | cpu_context(cpu, current->mm)); |
| 688 | kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", |
| 689 | cpu, vcpu->arch.guest_kernel_asid[cpu]); |
| 690 | kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, |
| 691 | vcpu->arch.guest_user_asid[cpu]); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | if (vcpu->arch.last_sched_cpu != cpu) { |
James Hogan | 6e95bfd | 2014-05-29 10:16:43 +0100 | [diff] [blame] | 695 | kvm_debug("[%d->%d]KVM VCPU[%d] switch\n", |
| 696 | vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); |
James Hogan | 3a0ba77 | 2014-05-29 10:16:34 +0100 | [diff] [blame] | 697 | /* |
| 698 | * Migrate the timer interrupt to the current CPU so that it |
| 699 | * always interrupts the guest and synchronously triggers a |
| 700 | * guest timer interrupt. |
| 701 | */ |
| 702 | kvm_mips_migrate_count(vcpu); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 703 | } |
| 704 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 705 | if (!newasid) { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 706 | /* |
| 707 | * If we preempted while the guest was executing, then reload |
| 708 | * the pre-empted ASID |
| 709 | */ |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 710 | if (current->flags & PF_VCPU) { |
David Daney | 48c4ac9 | 2013-05-13 13:56:44 -0700 | [diff] [blame] | 711 | write_c0_entryhi(vcpu->arch. |
| 712 | preempt_entryhi & ASID_MASK); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 713 | ehb(); |
| 714 | } |
| 715 | } else { |
| 716 | /* New ASIDs were allocated for the VM */ |
| 717 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 718 | /* |
| 719 | * Were we in guest context? If so then the pre-empted ASID is |
| 720 | * no longer valid, we need to set it to what it should be based |
| 721 | * on the mode of the Guest (Kernel/User) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 722 | */ |
| 723 | if (current->flags & PF_VCPU) { |
| 724 | if (KVM_GUEST_KERNEL_MODE(vcpu)) |
David Daney | 48c4ac9 | 2013-05-13 13:56:44 -0700 | [diff] [blame] | 725 | write_c0_entryhi(vcpu->arch. |
| 726 | guest_kernel_asid[cpu] & |
| 727 | ASID_MASK); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 728 | else |
David Daney | 48c4ac9 | 2013-05-13 13:56:44 -0700 | [diff] [blame] | 729 | write_c0_entryhi(vcpu->arch. |
| 730 | guest_user_asid[cpu] & |
| 731 | ASID_MASK); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 732 | ehb(); |
| 733 | } |
| 734 | } |
| 735 | |
James Hogan | b86ecb3 | 2015-02-09 16:35:20 +0000 | [diff] [blame] | 736 | /* restore guest state to registers */ |
| 737 | kvm_mips_callbacks->vcpu_set_regs(vcpu); |
| 738 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 739 | local_irq_restore(flags); |
| 740 | |
| 741 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 742 | EXPORT_SYMBOL(kvm_arch_vcpu_load); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 743 | |
| 744 | /* ASID can change if another task is scheduled during preemption */ |
| 745 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) |
| 746 | { |
| 747 | unsigned long flags; |
| 748 | uint32_t cpu; |
| 749 | |
| 750 | local_irq_save(flags); |
| 751 | |
| 752 | cpu = smp_processor_id(); |
| 753 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 754 | vcpu->arch.preempt_entryhi = read_c0_entryhi(); |
| 755 | vcpu->arch.last_sched_cpu = cpu; |
| 756 | |
James Hogan | b86ecb3 | 2015-02-09 16:35:20 +0000 | [diff] [blame] | 757 | /* save guest state in registers */ |
| 758 | kvm_mips_callbacks->vcpu_get_regs(vcpu); |
| 759 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 760 | if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & |
| 761 | ASID_VERSION_MASK)) { |
| 762 | kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, |
| 763 | cpu_context(cpu, current->mm)); |
| 764 | drop_mmu_context(current->mm, cpu); |
| 765 | } |
| 766 | write_c0_entryhi(cpu_asid(cpu, current->mm)); |
| 767 | ehb(); |
| 768 | |
| 769 | local_irq_restore(flags); |
| 770 | } |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 771 | EXPORT_SYMBOL(kvm_arch_vcpu_put); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 772 | |
| 773 | uint32_t kvm_get_inst(uint32_t *opc, struct kvm_vcpu *vcpu) |
| 774 | { |
| 775 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 776 | unsigned long paddr, flags, vpn2, asid; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 777 | uint32_t inst; |
| 778 | int index; |
| 779 | |
| 780 | if (KVM_GUEST_KSEGX((unsigned long) opc) < KVM_GUEST_KSEG0 || |
| 781 | KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) { |
| 782 | local_irq_save(flags); |
| 783 | index = kvm_mips_host_tlb_lookup(vcpu, (unsigned long) opc); |
| 784 | if (index >= 0) { |
| 785 | inst = *(opc); |
| 786 | } else { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 787 | vpn2 = (unsigned long) opc & VPN2_MASK; |
| 788 | asid = kvm_read_c0_guest_entryhi(cop0) & ASID_MASK; |
| 789 | index = kvm_mips_guest_tlb_lookup(vcpu, vpn2 | asid); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 790 | if (index < 0) { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 791 | kvm_err("%s: get_user_failed for %p, vcpu: %p, ASID: %#lx\n", |
| 792 | __func__, opc, vcpu, read_c0_entryhi()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 793 | kvm_mips_dump_host_tlbs(); |
| 794 | local_irq_restore(flags); |
| 795 | return KVM_INVALID_INST; |
| 796 | } |
| 797 | kvm_mips_handle_mapped_seg_tlb_fault(vcpu, |
| 798 | &vcpu->arch. |
| 799 | guest_tlb[index], |
| 800 | NULL, NULL); |
| 801 | inst = *(opc); |
| 802 | } |
| 803 | local_irq_restore(flags); |
| 804 | } else if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) { |
| 805 | paddr = |
| 806 | kvm_mips_translate_guest_kseg0_to_hpa(vcpu, |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 807 | (unsigned long) opc); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 808 | inst = *(uint32_t *) CKSEG0ADDR(paddr); |
| 809 | } else { |
| 810 | kvm_err("%s: illegal address: %p\n", __func__, opc); |
| 811 | return KVM_INVALID_INST; |
| 812 | } |
| 813 | |
| 814 | return inst; |
| 815 | } |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 816 | EXPORT_SYMBOL(kvm_get_inst); |