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 | |
| 38 | /* These function pointers are initialized once the KVM module is loaded */ |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 39 | kvm_pfn_t (*kvm_mips_gfn_to_pfn)(struct kvm *kvm, gfn_t gfn); |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 40 | EXPORT_SYMBOL_GPL(kvm_mips_gfn_to_pfn); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 41 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 42 | void (*kvm_mips_release_pfn_clean)(kvm_pfn_t pfn); |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 43 | EXPORT_SYMBOL_GPL(kvm_mips_release_pfn_clean); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 44 | |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 45 | bool (*kvm_mips_is_error_pfn)(kvm_pfn_t pfn); |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 46 | EXPORT_SYMBOL_GPL(kvm_mips_is_error_pfn); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 47 | |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame^] | 48 | static u32 kvm_mips_get_kernel_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 49 | { |
Paul Burton | 4edf00a | 2016-05-06 14:36:23 +0100 | [diff] [blame] | 50 | int cpu = smp_processor_id(); |
| 51 | |
| 52 | return vcpu->arch.guest_kernel_asid[cpu] & |
| 53 | cpu_asid_mask(&cpu_data[cpu]); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 54 | } |
| 55 | |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame^] | 56 | static u32 kvm_mips_get_user_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 57 | { |
Paul Burton | 4edf00a | 2016-05-06 14:36:23 +0100 | [diff] [blame] | 58 | int cpu = smp_processor_id(); |
| 59 | |
| 60 | return vcpu->arch.guest_user_asid[cpu] & |
| 61 | cpu_asid_mask(&cpu_data[cpu]); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 62 | } |
| 63 | |
James Hogan | bdb7ed8 | 2016-06-09 14:19:07 +0100 | [diff] [blame] | 64 | inline u32 kvm_mips_get_commpage_asid(struct kvm_vcpu *vcpu) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 65 | { |
| 66 | return vcpu->kvm->arch.commpage_tlb; |
| 67 | } |
| 68 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 69 | /* Structure defining an tlb entry data set. */ |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 70 | |
| 71 | void kvm_mips_dump_host_tlbs(void) |
| 72 | { |
| 73 | unsigned long old_entryhi; |
| 74 | unsigned long old_pagemask; |
| 75 | struct kvm_mips_tlb tlb; |
| 76 | unsigned long flags; |
| 77 | int i; |
| 78 | |
| 79 | local_irq_save(flags); |
| 80 | |
| 81 | old_entryhi = read_c0_entryhi(); |
| 82 | old_pagemask = read_c0_pagemask(); |
| 83 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 84 | kvm_info("HOST TLBs:\n"); |
Paul Burton | 4edf00a | 2016-05-06 14:36:23 +0100 | [diff] [blame] | 85 | kvm_info("ASID: %#lx\n", read_c0_entryhi() & |
| 86 | cpu_asid_mask(¤t_cpu_data)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 87 | |
| 88 | for (i = 0; i < current_cpu_data.tlbsize; i++) { |
| 89 | write_c0_index(i); |
| 90 | mtc0_tlbw_hazard(); |
| 91 | |
| 92 | tlb_read(); |
| 93 | tlbw_use_hazard(); |
| 94 | |
| 95 | tlb.tlb_hi = read_c0_entryhi(); |
| 96 | tlb.tlb_lo0 = read_c0_entrylo0(); |
| 97 | tlb.tlb_lo1 = read_c0_entrylo1(); |
| 98 | tlb.tlb_mask = read_c0_pagemask(); |
| 99 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 100 | kvm_info("TLB%c%3d Hi 0x%08lx ", |
| 101 | (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| 102 | i, tlb.tlb_hi); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 103 | kvm_info("Lo0=0x%09llx %c%c attr %lx ", |
| 104 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 105 | (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| 106 | (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| 107 | (tlb.tlb_lo0 >> 3) & 7); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 108 | kvm_info("Lo1=0x%09llx %c%c attr %lx sz=%lx\n", |
| 109 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 110 | (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| 111 | (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| 112 | (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 113 | } |
| 114 | write_c0_entryhi(old_entryhi); |
| 115 | write_c0_pagemask(old_pagemask); |
| 116 | mtc0_tlbw_hazard(); |
| 117 | local_irq_restore(flags); |
| 118 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 119 | EXPORT_SYMBOL_GPL(kvm_mips_dump_host_tlbs); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 120 | |
| 121 | void kvm_mips_dump_guest_tlbs(struct kvm_vcpu *vcpu) |
| 122 | { |
| 123 | struct mips_coproc *cop0 = vcpu->arch.cop0; |
| 124 | struct kvm_mips_tlb tlb; |
| 125 | int i; |
| 126 | |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 127 | kvm_info("Guest TLBs:\n"); |
| 128 | kvm_info("Guest EntryHi: %#lx\n", kvm_read_c0_guest_entryhi(cop0)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 129 | |
| 130 | for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
| 131 | tlb = vcpu->arch.guest_tlb[i]; |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 132 | kvm_info("TLB%c%3d Hi 0x%08lx ", |
| 133 | (tlb.tlb_lo0 | tlb.tlb_lo1) & MIPS3_PG_V ? ' ' : '*', |
| 134 | i, tlb.tlb_hi); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 135 | kvm_info("Lo0=0x%09llx %c%c attr %lx ", |
| 136 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo0), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 137 | (tlb.tlb_lo0 & MIPS3_PG_D) ? 'D' : ' ', |
| 138 | (tlb.tlb_lo0 & MIPS3_PG_G) ? 'G' : ' ', |
| 139 | (tlb.tlb_lo0 >> 3) & 7); |
James Hogan | 8cffd19 | 2016-06-09 14:19:08 +0100 | [diff] [blame] | 140 | kvm_info("Lo1=0x%09llx %c%c attr %lx sz=%lx\n", |
| 141 | (u64) mips3_tlbpfn_to_paddr(tlb.tlb_lo1), |
Deng-Cheng Zhu | 6ad78a5 | 2014-06-26 12:11:35 -0700 | [diff] [blame] | 142 | (tlb.tlb_lo1 & MIPS3_PG_D) ? 'D' : ' ', |
| 143 | (tlb.tlb_lo1 & MIPS3_PG_G) ? 'G' : ' ', |
| 144 | (tlb.tlb_lo1 >> 3) & 7, tlb.tlb_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 145 | } |
| 146 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 147 | EXPORT_SYMBOL_GPL(kvm_mips_dump_guest_tlbs); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 148 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 149 | /* XXXKYMA: Must be called with interrupts disabled */ |
| 150 | /* set flush_dcache_mask == 0 if no dcache flush required */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 151 | int kvm_mips_host_tlb_write(struct kvm_vcpu *vcpu, unsigned long entryhi, |
| 152 | unsigned long entrylo0, unsigned long entrylo1, |
| 153 | int flush_dcache_mask) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 154 | { |
| 155 | unsigned long flags; |
| 156 | unsigned long old_entryhi; |
Deng-Cheng Zhu | b045c40 | 2014-06-26 12:11:37 -0700 | [diff] [blame] | 157 | int idx; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 158 | |
| 159 | local_irq_save(flags); |
| 160 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 161 | old_entryhi = read_c0_entryhi(); |
| 162 | write_c0_entryhi(entryhi); |
| 163 | mtc0_tlbw_hazard(); |
| 164 | |
| 165 | tlb_probe(); |
| 166 | tlb_probe_hazard(); |
| 167 | idx = read_c0_index(); |
| 168 | |
| 169 | if (idx > current_cpu_data.tlbsize) { |
| 170 | kvm_err("%s: Invalid Index: %d\n", __func__, idx); |
| 171 | kvm_mips_dump_host_tlbs(); |
Tapasweni Pathak | cfec0e7 | 2015-02-22 21:48:21 +0530 | [diff] [blame] | 172 | local_irq_restore(flags); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 173 | return -1; |
| 174 | } |
| 175 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 176 | write_c0_entrylo0(entrylo0); |
| 177 | write_c0_entrylo1(entrylo1); |
| 178 | mtc0_tlbw_hazard(); |
| 179 | |
James Hogan | b5dfc6c | 2014-05-29 10:16:26 +0100 | [diff] [blame] | 180 | if (idx < 0) |
| 181 | tlb_write_random(); |
| 182 | else |
| 183 | tlb_write_indexed(); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 184 | tlbw_use_hazard(); |
| 185 | |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 186 | kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0(R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| 187 | vcpu->arch.pc, idx, read_c0_entryhi(), |
| 188 | read_c0_entrylo0(), read_c0_entrylo1()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 189 | |
| 190 | /* Flush D-cache */ |
| 191 | if (flush_dcache_mask) { |
| 192 | if (entrylo0 & MIPS3_PG_V) { |
| 193 | ++vcpu->stat.flush_dcache_exits; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 194 | flush_data_cache_page((entryhi & VPN2_MASK) & |
| 195 | ~flush_dcache_mask); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 196 | } |
| 197 | if (entrylo1 & MIPS3_PG_V) { |
| 198 | ++vcpu->stat.flush_dcache_exits; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 199 | flush_data_cache_page(((entryhi & VPN2_MASK) & |
| 200 | ~flush_dcache_mask) | |
| 201 | (0x1 << PAGE_SHIFT)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 202 | } |
| 203 | } |
| 204 | |
| 205 | /* Restore old ASID */ |
| 206 | write_c0_entryhi(old_entryhi); |
| 207 | mtc0_tlbw_hazard(); |
| 208 | tlbw_use_hazard(); |
| 209 | local_irq_restore(flags); |
| 210 | return 0; |
| 211 | } |
James Hogan | 403015b | 2016-06-09 14:19:10 +0100 | [diff] [blame^] | 212 | EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_write); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 213 | |
| 214 | int kvm_mips_handle_commpage_tlb_fault(unsigned long badvaddr, |
| 215 | struct kvm_vcpu *vcpu) |
| 216 | { |
Dan Williams | ba049e9 | 2016-01-15 16:56:11 -0800 | [diff] [blame] | 217 | kvm_pfn_t pfn0, pfn1; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 218 | unsigned long flags, old_entryhi = 0, vaddr = 0; |
| 219 | unsigned long entrylo0 = 0, entrylo1 = 0; |
| 220 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 221 | pfn0 = CPHYSADDR(vcpu->arch.kseg0_commpage) >> PAGE_SHIFT; |
| 222 | pfn1 = 0; |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 223 | entrylo0 = mips3_paddr_to_tlbpfn(pfn0 << PAGE_SHIFT) | (0x3 << 3) | |
| 224 | (1 << 2) | (0x1 << 1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 225 | entrylo1 = 0; |
| 226 | |
| 227 | local_irq_save(flags); |
| 228 | |
| 229 | old_entryhi = read_c0_entryhi(); |
| 230 | vaddr = badvaddr & (PAGE_MASK << 1); |
| 231 | write_c0_entryhi(vaddr | kvm_mips_get_kernel_asid(vcpu)); |
| 232 | mtc0_tlbw_hazard(); |
| 233 | write_c0_entrylo0(entrylo0); |
| 234 | mtc0_tlbw_hazard(); |
| 235 | write_c0_entrylo1(entrylo1); |
| 236 | mtc0_tlbw_hazard(); |
| 237 | write_c0_index(kvm_mips_get_commpage_asid(vcpu)); |
| 238 | mtc0_tlbw_hazard(); |
| 239 | tlb_write_indexed(); |
| 240 | mtc0_tlbw_hazard(); |
| 241 | tlbw_use_hazard(); |
| 242 | |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 243 | kvm_debug("@ %#lx idx: %2d [entryhi(R): %#lx] entrylo0 (R): 0x%08lx, entrylo1(R): 0x%08lx\n", |
| 244 | vcpu->arch.pc, read_c0_index(), read_c0_entryhi(), |
| 245 | read_c0_entrylo0(), read_c0_entrylo1()); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 246 | |
| 247 | /* Restore old ASID */ |
| 248 | write_c0_entryhi(old_entryhi); |
| 249 | mtc0_tlbw_hazard(); |
| 250 | tlbw_use_hazard(); |
| 251 | local_irq_restore(flags); |
| 252 | |
| 253 | return 0; |
| 254 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 255 | EXPORT_SYMBOL_GPL(kvm_mips_handle_commpage_tlb_fault); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 256 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 257 | int kvm_mips_guest_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long entryhi) |
| 258 | { |
| 259 | int i; |
| 260 | int index = -1; |
| 261 | struct kvm_mips_tlb *tlb = vcpu->arch.guest_tlb; |
| 262 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 263 | for (i = 0; i < KVM_MIPS_GUEST_TLB_SIZE; i++) { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 264 | if (TLB_HI_VPN2_HIT(tlb[i], entryhi) && |
| 265 | TLB_HI_ASID_HIT(tlb[i], entryhi)) { |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 266 | index = i; |
| 267 | break; |
| 268 | } |
| 269 | } |
| 270 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 271 | kvm_debug("%s: entryhi: %#lx, index: %d lo0: %#lx, lo1: %#lx\n", |
| 272 | __func__, entryhi, index, tlb[i].tlb_lo0, tlb[i].tlb_lo1); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 273 | |
| 274 | return index; |
| 275 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 276 | EXPORT_SYMBOL_GPL(kvm_mips_guest_tlb_lookup); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 277 | |
| 278 | int kvm_mips_host_tlb_lookup(struct kvm_vcpu *vcpu, unsigned long vaddr) |
| 279 | { |
| 280 | unsigned long old_entryhi, flags; |
Deng-Cheng Zhu | b045c40 | 2014-06-26 12:11:37 -0700 | [diff] [blame] | 281 | int idx; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 282 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 283 | local_irq_save(flags); |
| 284 | |
| 285 | old_entryhi = read_c0_entryhi(); |
| 286 | |
| 287 | if (KVM_GUEST_KERNEL_MODE(vcpu)) |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 288 | write_c0_entryhi((vaddr & VPN2_MASK) | |
| 289 | kvm_mips_get_kernel_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 290 | else { |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 291 | write_c0_entryhi((vaddr & VPN2_MASK) | |
| 292 | kvm_mips_get_user_asid(vcpu)); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | mtc0_tlbw_hazard(); |
| 296 | |
| 297 | tlb_probe(); |
| 298 | tlb_probe_hazard(); |
| 299 | idx = read_c0_index(); |
| 300 | |
| 301 | /* Restore old ASID */ |
| 302 | write_c0_entryhi(old_entryhi); |
| 303 | mtc0_tlbw_hazard(); |
| 304 | tlbw_use_hazard(); |
| 305 | |
| 306 | local_irq_restore(flags); |
| 307 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 308 | kvm_debug("Host TLB lookup, %#lx, idx: %2d\n", vaddr, idx); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 309 | |
| 310 | return idx; |
| 311 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 312 | EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_lookup); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 313 | |
| 314 | int kvm_mips_host_tlb_inv(struct kvm_vcpu *vcpu, unsigned long va) |
| 315 | { |
| 316 | int idx; |
| 317 | unsigned long flags, old_entryhi; |
| 318 | |
| 319 | local_irq_save(flags); |
| 320 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 321 | old_entryhi = read_c0_entryhi(); |
| 322 | |
| 323 | write_c0_entryhi((va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu)); |
| 324 | mtc0_tlbw_hazard(); |
| 325 | |
| 326 | tlb_probe(); |
| 327 | tlb_probe_hazard(); |
| 328 | idx = read_c0_index(); |
| 329 | |
| 330 | if (idx >= current_cpu_data.tlbsize) |
| 331 | BUG(); |
| 332 | |
| 333 | if (idx > 0) { |
| 334 | write_c0_entryhi(UNIQUE_ENTRYHI(idx)); |
| 335 | mtc0_tlbw_hazard(); |
| 336 | |
| 337 | write_c0_entrylo0(0); |
| 338 | mtc0_tlbw_hazard(); |
| 339 | |
| 340 | write_c0_entrylo1(0); |
| 341 | mtc0_tlbw_hazard(); |
| 342 | |
| 343 | tlb_write_indexed(); |
| 344 | mtc0_tlbw_hazard(); |
| 345 | } |
| 346 | |
| 347 | write_c0_entryhi(old_entryhi); |
| 348 | mtc0_tlbw_hazard(); |
| 349 | tlbw_use_hazard(); |
| 350 | |
| 351 | local_irq_restore(flags); |
| 352 | |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 353 | if (idx > 0) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 354 | kvm_debug("%s: Invalidated entryhi %#lx @ idx %d\n", __func__, |
James Hogan | 3d65483 | 2014-05-29 10:16:41 +0100 | [diff] [blame] | 355 | (va & VPN2_MASK) | kvm_mips_get_user_asid(vcpu), idx); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 356 | |
| 357 | return 0; |
| 358 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 359 | EXPORT_SYMBOL_GPL(kvm_mips_host_tlb_inv); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 360 | |
| 361 | void kvm_mips_flush_host_tlb(int skip_kseg0) |
| 362 | { |
| 363 | unsigned long flags; |
| 364 | unsigned long old_entryhi, entryhi; |
| 365 | unsigned long old_pagemask; |
| 366 | int entry = 0; |
| 367 | int maxentry = current_cpu_data.tlbsize; |
| 368 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 369 | local_irq_save(flags); |
| 370 | |
| 371 | old_entryhi = read_c0_entryhi(); |
| 372 | old_pagemask = read_c0_pagemask(); |
| 373 | |
| 374 | /* Blast 'em all away. */ |
| 375 | for (entry = 0; entry < maxentry; entry++) { |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 376 | write_c0_index(entry); |
| 377 | mtc0_tlbw_hazard(); |
| 378 | |
| 379 | if (skip_kseg0) { |
| 380 | tlb_read(); |
| 381 | tlbw_use_hazard(); |
| 382 | |
| 383 | entryhi = read_c0_entryhi(); |
| 384 | |
| 385 | /* Don't blow away guest kernel entries */ |
Deng-Cheng Zhu | d116e81 | 2014-06-26 12:11:34 -0700 | [diff] [blame] | 386 | if (KVM_GUEST_KSEGX(entryhi) == KVM_GUEST_KSEG0) |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 387 | continue; |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | /* Make sure all entries differ. */ |
| 391 | write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| 392 | mtc0_tlbw_hazard(); |
| 393 | write_c0_entrylo0(0); |
| 394 | mtc0_tlbw_hazard(); |
| 395 | write_c0_entrylo1(0); |
| 396 | mtc0_tlbw_hazard(); |
| 397 | |
| 398 | tlb_write_indexed(); |
| 399 | mtc0_tlbw_hazard(); |
| 400 | } |
| 401 | |
| 402 | tlbw_use_hazard(); |
| 403 | |
| 404 | write_c0_entryhi(old_entryhi); |
| 405 | write_c0_pagemask(old_pagemask); |
| 406 | mtc0_tlbw_hazard(); |
| 407 | tlbw_use_hazard(); |
| 408 | |
| 409 | local_irq_restore(flags); |
| 410 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 411 | EXPORT_SYMBOL_GPL(kvm_mips_flush_host_tlb); |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 412 | |
Sanjay Lal | 858dd5d | 2012-11-21 18:34:05 -0800 | [diff] [blame] | 413 | void kvm_local_flush_tlb_all(void) |
| 414 | { |
| 415 | unsigned long flags; |
| 416 | unsigned long old_ctx; |
| 417 | int entry = 0; |
| 418 | |
| 419 | local_irq_save(flags); |
| 420 | /* Save old context and create impossible VPN2 value */ |
| 421 | old_ctx = read_c0_entryhi(); |
| 422 | write_c0_entrylo0(0); |
| 423 | write_c0_entrylo1(0); |
| 424 | |
| 425 | /* Blast 'em all away. */ |
| 426 | while (entry < current_cpu_data.tlbsize) { |
| 427 | /* Make sure all entries differ. */ |
| 428 | write_c0_entryhi(UNIQUE_ENTRYHI(entry)); |
| 429 | write_c0_index(entry); |
| 430 | mtc0_tlbw_hazard(); |
| 431 | tlb_write_indexed(); |
| 432 | entry++; |
| 433 | } |
| 434 | tlbw_use_hazard(); |
| 435 | write_c0_entryhi(old_ctx); |
| 436 | mtc0_tlbw_hazard(); |
| 437 | |
| 438 | local_irq_restore(flags); |
| 439 | } |
James Hogan | cb1b447 | 2015-12-16 23:49:30 +0000 | [diff] [blame] | 440 | EXPORT_SYMBOL_GPL(kvm_local_flush_tlb_all); |