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> |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame] | 17 | #include <linux/export.h> |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 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 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 35 | atomic_t kvm_mips_instance; |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 36 | EXPORT_SYMBOL_GPL(kvm_mips_instance); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 37 | |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame] | 38 | static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 39 | { |
Paul Burton | 4edf00a | 2016-05-06 14:36:23 +0100 | [diff] [blame] | 40 | int cpu = smp_processor_id(); |
| 41 | |
| 42 | return vcpu->arch.guest_kernel_asid[cpu] & |
| 43 | cpu_asid_mask(&cpu_data[cpu]); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 44 | } |
| 45 | |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame] | 46 | static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 47 | { |
Paul Burton | 4edf00a | 2016-05-06 14:36:23 +0100 | [diff] [blame] | 48 | int cpu = smp_processor_id(); |
| 49 | |
| 50 | return vcpu->arch.guest_user_asid[cpu] & |
| 51 | cpu_asid_mask(&cpu_data[cpu]); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 52 | } |
| 53 | |
James Hogan | bdb7ed8 | 2016-06-09 14:19:07 +0100 | [diff] [blame] | 54 | inline u32 kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 55 | { |
| 56 | return vcpu->kvm->arch.commpage_tlb; |
| 57 | } |
| 58 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 59 | /* Structure defining an tlb entry data set. */ |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 60 | |
| 61 | void kvm_mips_dump_host_tlbs(void) |
| 62 | { |
| 63 | unsigned long old_entryhi; |
| 64 | unsigned long old_pagemask; |
| 65 | struct kvm_mips_tlb tlb; |
| 66 | unsigned long flags; |
| 67 | int i; |
| 68 | |
| 69 | local_irq_save(flags); |
| 70 | |
| 71 | old_entryhi = read_c0_entryhi(); |
| 72 | old_pagemask = read_c0_pagemask(); |
| 73 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 74 | kvm_info("HOST TLBs:\n"); |
Paul Burton | 4edf00a | 2016-05-06 14:36:23 +0100 | [diff] [blame] | 75 | kvm_info("ASID: %#lx\n", read_c0_entryhi() & |
| 76 | cpu_asid_mask(¤t_cpu_data)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 77 | |
| 78 | for (i = 0; i < current_cpu_data.tlbsize; i++) { |
| 79 | write_c0_index(i); |
| 80 | mtc0_tlbw_hazard(); |
| 81 | |
| 82 | tlb_read(); |
| 83 | tlbw_use_hazard(); |
| 84 | |
| 85 | tlb.tlb_hi = read_c0_entryhi(); |
| 86 | tlb.tlb_lo0 = read_c0_entrylo0(); |
| 87 | tlb.tlb_lo1 = read_c0_entrylo1(); |
| 88 | tlb.tlb_mask = read_c0_pagemask(); |
| 89 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 90 | kvm_info("TLB%c%3d Hi 0x%08lx ", |
| 91 | (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| 92 | i, tlb.tlb_hi); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 93 | kvm_info("Lo0=0x%09llx %c%c attr %lx ", |
| 94 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 95 | (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| 96 | (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| 97 | (tlb.tlb_lo0 >> 3) & 7); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 98 | kvm_info("Lo1=0x%09llx %c%c attr %lx sz=%lx\n", |
| 99 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 100 | (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| 101 | (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| 102 | (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 103 | } |
| 104 | write_c0_entryhi(old_entryhi); |
| 105 | write_c0_pagemask(old_pagemask); |
| 106 | mtc0_tlbw_hazard(); |
| 107 | local_irq_restore(flags); |
| 108 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 109 | EXPORT_SYMBOL_GPL(kvm_mips_dump_host_tlbs); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 110 | |
| 111 | void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) |
| 112 | { |
| 113 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
| 114 | struct kvm_mips_tlb tlb; |
| 115 | int i; |
| 116 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 117 | kvm_info("Guest TLBs:\n"); |
| 118 | kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 119 | |
| 120 | for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
| 121 | tlb = vcpu->arch.guest_tlb[i]; |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 122 | kvm_info("TLB%c%3d Hi 0x%08lx ", |
| 123 | (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| 124 | i, tlb.tlb_hi); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 125 | kvm_info("Lo0=0x%09llx %c%c attr %lx ", |
| 126 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 127 | (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| 128 | (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| 129 | (tlb.tlb_lo0 >> 3) & 7); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 130 | kvm_info("Lo1=0x%09llx %c%c attr %lx sz=%lx\n", |
| 131 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 132 | (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| 133 | (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| 134 | (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 135 | } |
| 136 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 137 | EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 138 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 139 | /* XXXKYMA: Must be called with interrupts disabled */ |
| 140 | /* set flush_dcache_mask == 0 if no dcache flush required */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 141 | int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, |
| 142 | unsigned long entrylo0, unsigned long entrylo1, |
| 143 | int flush_dcache_mask) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 144 | { |
| 145 | unsigned long flags; |
| 146 | unsigned long old_entryhi; |
Deng-Cheng Zhu | b045c40 | 2014-06-26 12:11:37 -0700 | [diff] [blame] | 147 | int idx; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 148 | |
| 149 | local_irq_save(flags); |
| 150 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 151 | old_entryhi = read_c0_entryhi(); |
| 152 | write_c0_entryhi(entryhi); |
| 153 | mtc0_tlbw_hazard(); |
| 154 | |
| 155 | tlb_probe(); |
| 156 | tlb_probe_hazard(); |
| 157 | idx = read_c0_index(); |
| 158 | |
| 159 | if (idx > current_cpu_data.tlbsize) { |
| 160 | kvm_err("%s: Invalid Index: %d\n", __func__, idx); |
| 161 | kvm_mips_dump_host_tlbs(); |
Tapasweni Pathak | cfec0e7 | 2015-02-22 21:48:21 +0530 | [diff] [blame] | 162 | local_irq_restore(flags); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 163 | return -1; |
| 164 | } |
| 165 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 166 | write_c0_entrylo0(entrylo0); |
| 167 | write_c0_entrylo1(entrylo1); |
| 168 | mtc0_tlbw_hazard(); |
| 169 | |
James Hogan | b5dfc6c | 2014-05-29 10:16:26 +0100 | [diff] [blame] | 170 | if (idx < 0) |
| 171 | tlb_write_random(); |
| 172 | else |
| 173 | tlb_write_indexed(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 174 | tlbw_use_hazard(); |
| 175 | |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 176 | kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| 177 | vcpu->arch.pc, idx, read_c0_entryhi(), |
| 178 | read_c0_entrylo0(), read_c0_entrylo1()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 179 | |
| 180 | /* Flush D-cache */ |
| 181 | if (flush_dcache_mask) { |
| 182 | if (entrylo0 & MIPS3_PG_V) { |
| 183 | ++vcpu->stat.flush_dcache_exits; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 184 | flush_data_cache_page((entryhi & VPN2_MASK) & |
| 185 | ~flush_dcache_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 186 | } |
| 187 | if (entrylo1 & MIPS3_PG_V) { |
| 188 | ++vcpu->stat.flush_dcache_exits; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 189 | flush_data_cache_page(((entryhi & VPN2_MASK) & |
| 190 | ~flush_dcache_mask) | |
| 191 | (0x1 << PAGE_SHIFT)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 192 | } |
| 193 | } |
| 194 | |
| 195 | /* Restore old ASID */ |
| 196 | write_c0_entryhi(old_entryhi); |
| 197 | mtc0_tlbw_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 198 | local_irq_restore(flags); |
| 199 | return 0; |
| 200 | } |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame] | 201 | EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 202 | |
| 203 | int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, |
| 204 | struct kvm_vcpu *vcpu) |
| 205 | { |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 206 | kvm_pfn_t pfn0, pfn1; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 207 | unsigned long flags, old_entryhi = 0, vaddr = 0; |
| 208 | unsigned long entrylo0 = 0, entrylo1 = 0; |
| 209 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 210 | pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; |
| 211 | pfn1 = 0; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 212 | entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| 213 | (1 << 2) | (0x1 << 1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 214 | entrylo1 = 0; |
| 215 | |
| 216 | local_irq_save(flags); |
| 217 | |
| 218 | old_entryhi = read_c0_entryhi(); |
| 219 | vaddr = badvaddr & (PAGE_MASK << 1); |
| 220 | write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 221 | write_c0_entrylo0(entrylo0); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 222 | write_c0_entrylo1(entrylo1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 223 | write_c0_index(kvm_mips_get_commpage_asid(vcpu)); |
| 224 | mtc0_tlbw_hazard(); |
| 225 | tlb_write_indexed(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 226 | tlbw_use_hazard(); |
| 227 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 228 | kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| 229 | vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), |
| 230 | read_c0_entrylo0(), read_c0_entrylo1()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 231 | |
| 232 | /* Restore old ASID */ |
| 233 | write_c0_entryhi(old_entryhi); |
| 234 | mtc0_tlbw_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 235 | local_irq_restore(flags); |
| 236 | |
| 237 | return 0; |
| 238 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 239 | EXPORT_SYMBOL_GPL(kvm_mips_handle_commpage_tlb_fault); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 240 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 241 | int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) |
| 242 | { |
| 243 | int i; |
| 244 | int index = -1; |
| 245 | struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; |
| 246 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 247 | for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 248 | if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && |
| 249 | TLB_HI_ASID_HIT(tlb[i], entryhi)) { |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 250 | index = i; |
| 251 | break; |
| 252 | } |
| 253 | } |
| 254 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 255 | kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n", |
| 256 | __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 257 | |
| 258 | return index; |
| 259 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 260 | EXPORT_SYMBOL_GPL(kvm_mips_guest_tlb_lookup); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 261 | |
| 262 | int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) |
| 263 | { |
| 264 | unsigned long old_entryhi, flags; |
Deng-Cheng Zhu | b045c40 | 2014-06-26 12:11:37 -0700 | [diff] [blame] | 265 | int idx; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 266 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 267 | local_irq_save(flags); |
| 268 | |
| 269 | old_entryhi = read_c0_entryhi(); |
| 270 | |
| 271 | if (KVM_GUEST_KERNEL_MODE(vcpu)) |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 272 | write_c0_entryhi((vaddr & VPN2_MASK) | |
| 273 | kvm_mips_get_kernel_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 274 | else { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 275 | write_c0_entryhi((vaddr & VPN2_MASK) | |
| 276 | kvm_mips_get_user_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | mtc0_tlbw_hazard(); |
| 280 | |
| 281 | tlb_probe(); |
| 282 | tlb_probe_hazard(); |
| 283 | idx = read_c0_index(); |
| 284 | |
| 285 | /* Restore old ASID */ |
| 286 | write_c0_entryhi(old_entryhi); |
| 287 | mtc0_tlbw_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 288 | |
| 289 | local_irq_restore(flags); |
| 290 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 291 | kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 292 | |
| 293 | return idx; |
| 294 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 295 | EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_lookup); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 296 | |
| 297 | int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) |
| 298 | { |
| 299 | int idx; |
| 300 | unsigned long flags, old_entryhi; |
| 301 | |
| 302 | local_irq_save(flags); |
| 303 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 304 | old_entryhi = read_c0_entryhi(); |
| 305 | |
| 306 | write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); |
| 307 | mtc0_tlbw_hazard(); |
| 308 | |
| 309 | tlb_probe(); |
| 310 | tlb_probe_hazard(); |
| 311 | idx = read_c0_index(); |
| 312 | |
| 313 | if (idx >= current_cpu_data.tlbsize) |
| 314 | BUG(); |
| 315 | |
| 316 | if (idx > 0) { |
| 317 | write_c0_entryhi(UNIQUE_ENTRYHI(idx)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 318 | write_c0_entrylo0(0); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 319 | write_c0_entrylo1(0); |
| 320 | mtc0_tlbw_hazard(); |
| 321 | |
| 322 | tlb_write_indexed(); |
James Hogan | 138f7ad | 2016-06-09 14:19:15 +0100 | [diff] [blame^] | 323 | tlbw_use_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 324 | } |
| 325 | |
| 326 | write_c0_entryhi(old_entryhi); |
| 327 | mtc0_tlbw_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 328 | |
| 329 | local_irq_restore(flags); |
| 330 | |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 331 | if (idx > 0) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 332 | kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__, |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 333 | (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 334 | |
| 335 | return 0; |
| 336 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 337 | EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_inv); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 338 | |
| 339 | void kvm_mips_flush_host_tlb(int skip_kseg0) |
| 340 | { |
| 341 | unsigned long flags; |
| 342 | unsigned long old_entryhi, entryhi; |
| 343 | unsigned long old_pagemask; |
| 344 | int entry = 0; |
| 345 | int maxentry = current_cpu_data.tlbsize; |
| 346 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 347 | local_irq_save(flags); |
| 348 | |
| 349 | old_entryhi = read_c0_entryhi(); |
| 350 | old_pagemask = read_c0_pagemask(); |
| 351 | |
| 352 | /* Blast 'em all away. */ |
| 353 | for (entry = 0; entry < maxentry; entry++) { |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 354 | write_c0_index(entry); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 355 | |
| 356 | if (skip_kseg0) { |
James Hogan | 138f7ad | 2016-06-09 14:19:15 +0100 | [diff] [blame^] | 357 | mtc0_tlbr_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 358 | tlb_read(); |
James Hogan | 138f7ad | 2016-06-09 14:19:15 +0100 | [diff] [blame^] | 359 | tlb_read_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 360 | |
| 361 | entryhi = read_c0_entryhi(); |
| 362 | |
| 363 | /* Don't blow away guest kernel entries */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 364 | if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 365 | continue; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | /* Make sure all entries differ. */ |
| 369 | write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 370 | write_c0_entrylo0(0); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 371 | write_c0_entrylo1(0); |
| 372 | mtc0_tlbw_hazard(); |
| 373 | |
| 374 | tlb_write_indexed(); |
James Hogan | 138f7ad | 2016-06-09 14:19:15 +0100 | [diff] [blame^] | 375 | tlbw_use_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 376 | } |
| 377 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 378 | write_c0_entryhi(old_entryhi); |
| 379 | write_c0_pagemask(old_pagemask); |
| 380 | mtc0_tlbw_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 381 | |
| 382 | local_irq_restore(flags); |
| 383 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 384 | EXPORT_SYMBOL_GPL(kvm_mips_flush_host_tlb); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 385 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 386 | void kvm_local_flush_tlb_all(void) |
| 387 | { |
| 388 | unsigned long flags; |
| 389 | unsigned long old_ctx; |
| 390 | int entry = 0; |
| 391 | |
| 392 | local_irq_save(flags); |
| 393 | /* Save old context and create impossible VPN2 value */ |
| 394 | old_ctx = read_c0_entryhi(); |
| 395 | write_c0_entrylo0(0); |
| 396 | write_c0_entrylo1(0); |
| 397 | |
| 398 | /* Blast 'em all away. */ |
| 399 | while (entry < current_cpu_data.tlbsize) { |
| 400 | /* Make sure all entries differ. */ |
| 401 | write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| 402 | write_c0_index(entry); |
| 403 | mtc0_tlbw_hazard(); |
| 404 | tlb_write_indexed(); |
James Hogan | 138f7ad | 2016-06-09 14:19:15 +0100 | [diff] [blame^] | 405 | tlbw_use_hazard(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 406 | entry++; |
| 407 | } |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 408 | write_c0_entryhi(old_ctx); |
| 409 | mtc0_tlbw_hazard(); |
| 410 | |
| 411 | local_irq_restore(flags); |
| 412 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 413 | EXPORT_SYMBOL_GPL(kvm_local_flush_tlb_all); |