1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012,2013 - ARM Ltd 4 * Author: Marc Zyngier <marc.zyngier@arm.com> 5 */ 6 7 #ifndef __ARM_KVM_INIT_H__ 8 #define __ARM_KVM_INIT_H__ 9 10 #ifndef __ASSEMBLY__ 11 #error Assembly-only header 12 #endif 13 14 #include <asm/kvm_arm.h> 15 #include <asm/ptrace.h> 16 #include <asm/sysreg.h> 17 #include <linux/irqchip/arm-gic-v3.h> 18 19 .macro __init_el2_sctlr 20 mov_q x0, INIT_SCTLR_EL2_MMU_OFF 21 msr sctlr_el2, x0 22 isb 23 .endm 24 25 .macro __init_el2_hcrx 26 mrs x0, id_aa64mmfr1_el1 27 ubfx x0, x0, #ID_AA64MMFR1_EL1_HCX_SHIFT, #4 28 cbz x0, .Lskip_hcrx_\@ 29 mov_q x0, HCRX_HOST_FLAGS 30 msr_s SYS_HCRX_EL2, x0 31 .Lskip_hcrx_\@: 32 .endm 33 34 /* Check if running in host at EL2 mode, i.e., (h)VHE. Jump to fail if not. */ 35 .macro __check_hvhe fail, tmp 36 mrs \tmp, hcr_el2 37 and \tmp, \tmp, #HCR_E2H 38 cbz \tmp, \fail 39 .endm 40 41 /* 42 * Allow Non-secure EL1 and EL0 to access physical timer and counter. 43 * This is not necessary for VHE, since the host kernel runs in EL2, 44 * and EL0 accesses are configured in the later stage of boot process. 45 * Note that when HCR_EL2.E2H == 1, CNTHCTL_EL2 has the same bit layout 46 * as CNTKCTL_EL1, and CNTKCTL_EL1 accessing instructions are redefined 47 * to access CNTHCTL_EL2. This allows the kernel designed to run at EL1 48 * to transparently mess with the EL0 bits via CNTKCTL_EL1 access in 49 * EL2. 50 */ 51 .macro __init_el2_timers 52 mov x0, #3 // Enable EL1 physical timers 53 __check_hvhe .LnVHE_\@, x1 54 lsl x0, x0, #10 55 .LnVHE_\@: 56 msr cnthctl_el2, x0 57 msr cntvoff_el2, xzr // Clear virtual offset 58 .endm 59 60 .macro __init_el2_debug 61 mrs x1, id_aa64dfr0_el1 62 ubfx x0, x1, #ID_AA64DFR0_EL1_PMUVer_SHIFT, #4 63 cmp x0, #ID_AA64DFR0_EL1_PMUVer_NI 64 ccmp x0, #ID_AA64DFR0_EL1_PMUVer_IMP_DEF, #4, ne 65 b.eq .Lskip_pmu_\@ // Skip if no PMU present or IMP_DEF 66 mrs x0, pmcr_el0 // Disable debug access traps 67 ubfx x0, x0, #11, #5 // to EL2 and allow access to 68 .Lskip_pmu_\@: 69 csel x2, xzr, x0, eq // all PMU counters from EL1 70 71 /* Statistical profiling */ 72 ubfx x0, x1, #ID_AA64DFR0_EL1_PMSVer_SHIFT, #4 73 cbz x0, .Lskip_spe_\@ // Skip if SPE not present 74 75 mrs_s x0, SYS_PMBIDR_EL1 // If SPE available at EL2, 76 and x0, x0, #(1 << PMBIDR_EL1_P_SHIFT) 77 cbnz x0, .Lskip_spe_el2_\@ // then permit sampling of physical 78 mov x0, #(1 << PMSCR_EL2_PCT_SHIFT | \ 79 1 << PMSCR_EL2_PA_SHIFT) 80 msr_s SYS_PMSCR_EL2, x0 // addresses and physical counter 81 .Lskip_spe_el2_\@: 82 mov x0, #(MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT) 83 orr x2, x2, x0 // If we don't have VHE, then 84 // use EL1&0 translation. 85 86 .Lskip_spe_\@: 87 /* Trace buffer */ 88 ubfx x0, x1, #ID_AA64DFR0_EL1_TraceBuffer_SHIFT, #4 89 cbz x0, .Lskip_trace_\@ // Skip if TraceBuffer is not present 90 91 mrs_s x0, SYS_TRBIDR_EL1 92 and x0, x0, TRBIDR_EL1_P 93 cbnz x0, .Lskip_trace_\@ // If TRBE is available at EL2 94 95 mov x0, #(MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT) 96 orr x2, x2, x0 // allow the EL1&0 translation 97 // to own it. 98 99 .Lskip_trace_\@: 100 msr mdcr_el2, x2 // Configure debug traps 101 .endm 102 103 /* LORegions */ 104 .macro __init_el2_lor 105 mrs x1, id_aa64mmfr1_el1 106 ubfx x0, x1, #ID_AA64MMFR1_EL1_LO_SHIFT, 4 107 cbz x0, .Lskip_lor_\@ 108 msr_s SYS_LORC_EL1, xzr 109 .Lskip_lor_\@: 110 .endm 111 112 /* Stage-2 translation */ 113 .macro __init_el2_stage2 114 msr vttbr_el2, xzr 115 .endm 116 117 /* GICv3 system register access */ 118 .macro __init_el2_gicv3 119 mrs x0, id_aa64pfr0_el1 120 ubfx x0, x0, #ID_AA64PFR0_EL1_GIC_SHIFT, #4 121 cbz x0, .Lskip_gicv3_\@ 122 123 mrs_s x0, SYS_ICC_SRE_EL2 124 orr x0, x0, #ICC_SRE_EL2_SRE // Set ICC_SRE_EL2.SRE==1 125 orr x0, x0, #ICC_SRE_EL2_ENABLE // Set ICC_SRE_EL2.Enable==1 126 msr_s SYS_ICC_SRE_EL2, x0 127 isb // Make sure SRE is now set 128 mrs_s x0, SYS_ICC_SRE_EL2 // Read SRE back, 129 tbz x0, #0, .Lskip_gicv3_\@ // and check that it sticks 130 msr_s SYS_ICH_HCR_EL2, xzr // Reset ICH_HCR_EL2 to defaults 131 .Lskip_gicv3_\@: 132 .endm 133 134 .macro __init_el2_hstr 135 msr hstr_el2, xzr // Disable CP15 traps to EL2 136 .endm 137 138 /* Virtual CPU ID registers */ 139 .macro __init_el2_nvhe_idregs 140 mrs x0, midr_el1 141 mrs x1, mpidr_el1 142 msr vpidr_el2, x0 143 msr vmpidr_el2, x1 144 .endm 145 146 /* Coprocessor traps */ 147 .macro __init_el2_cptr 148 __check_hvhe .LnVHE_\@, x1 149 mov x0, #CPACR_ELx_FPEN 150 msr cpacr_el1, x0 151 b .Lskip_set_cptr_\@ 152 .LnVHE_\@: 153 mov x0, #0x33ff 154 msr cptr_el2, x0 // Disable copro. traps to EL2 155 .Lskip_set_cptr_\@: 156 .endm 157 158 /* Disable any fine grained traps */ 159 .macro __init_el2_fgt 160 mrs x1, id_aa64mmfr0_el1 161 ubfx x1, x1, #ID_AA64MMFR0_EL1_FGT_SHIFT, #4 162 cbz x1, .Lskip_fgt_\@ 163 164 mov x0, xzr 165 mrs x1, id_aa64dfr0_el1 166 ubfx x1, x1, #ID_AA64DFR0_EL1_PMSVer_SHIFT, #4 167 cmp x1, #3 168 b.lt .Lskip_spe_fgt_\@ 169 /* Disable PMSNEVFR_EL1 read and write traps */ 170 orr x0, x0, #(1 << 62) 171 172 .Lskip_spe_fgt_\@: 173 msr_s SYS_HDFGRTR_EL2, x0 174 msr_s SYS_HDFGWTR_EL2, x0 175 176 mov x0, xzr 177 mrs x1, id_aa64pfr1_el1 178 ubfx x1, x1, #ID_AA64PFR1_EL1_SME_SHIFT, #4 179 cbz x1, .Lskip_debug_fgt_\@ 180 181 /* Disable nVHE traps of TPIDR2 and SMPRI */ 182 orr x0, x0, #HFGxTR_EL2_nSMPRI_EL1_MASK 183 orr x0, x0, #HFGxTR_EL2_nTPIDR2_EL0_MASK 184 185 .Lskip_debug_fgt_\@: 186 mrs_s x1, SYS_ID_AA64MMFR3_EL1 187 ubfx x1, x1, #ID_AA64MMFR3_EL1_S1PIE_SHIFT, #4 188 cbz x1, .Lskip_pie_fgt_\@ 189 190 /* Disable trapping of PIR_EL1 / PIRE0_EL1 */ 191 orr x0, x0, #HFGxTR_EL2_nPIR_EL1 192 orr x0, x0, #HFGxTR_EL2_nPIRE0_EL1 193 194 .Lskip_pie_fgt_\@: 195 mrs_s x1, SYS_ID_AA64MMFR3_EL1 196 ubfx x1, x1, #ID_AA64MMFR3_EL1_S1POE_SHIFT, #4 197 cbz x1, .Lskip_poe_fgt_\@ 198 199 /* Disable trapping of POR_EL0 */ 200 orr x0, x0, #HFGxTR_EL2_nPOR_EL0 201 202 .Lskip_poe_fgt_\@: 203 msr_s SYS_HFGRTR_EL2, x0 204 msr_s SYS_HFGWTR_EL2, x0 205 msr_s SYS_HFGITR_EL2, xzr 206 207 mrs x1, id_aa64pfr0_el1 // AMU traps UNDEF without AMU 208 ubfx x1, x1, #ID_AA64PFR0_EL1_AMU_SHIFT, #4 209 cbz x1, .Lskip_amu_fgt_\@ 210 211 msr_s SYS_HAFGRTR_EL2, xzr 212 213 .Lskip_amu_fgt_\@: 214 215 .Lskip_fgt_\@: 216 .endm 217 218 .macro __init_el2_nvhe_prepare_eret 219 mov x0, #INIT_PSTATE_EL1 220 msr spsr_el2, x0 221 .endm 222 223 /** 224 * Initialize EL2 registers to sane values. This should be called early on all 225 * cores that were booted in EL2. Note that everything gets initialised as 226 * if VHE was not available. The kernel context will be upgraded to VHE 227 * if possible later on in the boot process 228 * 229 * Regs: x0, x1 and x2 are clobbered. 230 */ 231 .macro init_el2_state 232 __init_el2_sctlr 233 __init_el2_hcrx 234 __init_el2_timers 235 __init_el2_debug 236 __init_el2_lor 237 __init_el2_stage2 238 __init_el2_gicv3 239 __init_el2_hstr 240 __init_el2_nvhe_idregs 241 __init_el2_cptr 242 __init_el2_fgt 243 .endm 244 245 #ifndef __KVM_NVHE_HYPERVISOR__ 246 // This will clobber tmp1 and tmp2, and expect tmp1 to contain 247 // the id register value as read from the HW 248 .macro __check_override idreg, fld, width, pass, fail, tmp1, tmp2 249 ubfx \tmp1, \tmp1, #\fld, #\width 250 cbz \tmp1, \fail 251 252 adr_l \tmp1, \idreg\()_override 253 ldr \tmp2, [\tmp1, FTR_OVR_VAL_OFFSET] 254 ldr \tmp1, [\tmp1, FTR_OVR_MASK_OFFSET] 255 ubfx \tmp2, \tmp2, #\fld, #\width 256 ubfx \tmp1, \tmp1, #\fld, #\width 257 cmp \tmp1, xzr 258 and \tmp2, \tmp2, \tmp1 259 csinv \tmp2, \tmp2, xzr, ne 260 cbnz \tmp2, \pass 261 b \fail 262 .endm 263 264 // This will clobber tmp1 and tmp2 265 .macro check_override idreg, fld, pass, fail, tmp1, tmp2 266 mrs \tmp1, \idreg\()_el1 267 __check_override \idreg \fld 4 \pass \fail \tmp1 \tmp2 268 .endm 269 #else 270 // This will clobber tmp 271 .macro __check_override idreg, fld, width, pass, fail, tmp, ignore 272 ldr_l \tmp, \idreg\()_el1_sys_val 273 ubfx \tmp, \tmp, #\fld, #\width 274 cbnz \tmp, \pass 275 b \fail 276 .endm 277 278 .macro check_override idreg, fld, pass, fail, tmp, ignore 279 __check_override \idreg \fld 4 \pass \fail \tmp \ignore 280 .endm 281 #endif 282 283 .macro finalise_el2_state 284 check_override id_aa64pfr0, ID_AA64PFR0_EL1_SVE_SHIFT, .Linit_sve_\@, .Lskip_sve_\@, x1, x2 285 286 .Linit_sve_\@: /* SVE register access */ 287 __check_hvhe .Lcptr_nvhe_\@, x1 288 289 // (h)VHE case 290 mrs x0, cpacr_el1 // Disable SVE traps 291 orr x0, x0, #CPACR_ELx_ZEN 292 msr cpacr_el1, x0 293 b .Lskip_set_cptr_\@ 294 295 .Lcptr_nvhe_\@: // nVHE case 296 mrs x0, cptr_el2 // Disable SVE traps 297 bic x0, x0, #CPTR_EL2_TZ 298 msr cptr_el2, x0 299 .Lskip_set_cptr_\@: 300 isb 301 mov x1, #ZCR_ELx_LEN_MASK // SVE: Enable full vector 302 msr_s SYS_ZCR_EL2, x1 // length for EL1. 303 304 .Lskip_sve_\@: 305 check_override id_aa64pfr1, ID_AA64PFR1_EL1_SME_SHIFT, .Linit_sme_\@, .Lskip_sme_\@, x1, x2 306 307 .Linit_sme_\@: /* SME register access and priority mapping */ 308 __check_hvhe .Lcptr_nvhe_sme_\@, x1 309 310 // (h)VHE case 311 mrs x0, cpacr_el1 // Disable SME traps 312 orr x0, x0, #CPACR_ELx_SMEN 313 msr cpacr_el1, x0 314 b .Lskip_set_cptr_sme_\@ 315 316 .Lcptr_nvhe_sme_\@: // nVHE case 317 mrs x0, cptr_el2 // Disable SME traps 318 bic x0, x0, #CPTR_EL2_TSM 319 msr cptr_el2, x0 320 .Lskip_set_cptr_sme_\@: 321 isb 322 323 mrs x1, sctlr_el2 324 orr x1, x1, #SCTLR_ELx_ENTP2 // Disable TPIDR2 traps 325 msr sctlr_el2, x1 326 isb 327 328 mov x0, #0 // SMCR controls 329 330 // Full FP in SM? 331 mrs_s x1, SYS_ID_AA64SMFR0_EL1 332 __check_override id_aa64smfr0, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, .Linit_sme_fa64_\@, .Lskip_sme_fa64_\@, x1, x2 333 334 .Linit_sme_fa64_\@: 335 orr x0, x0, SMCR_ELx_FA64_MASK 336 .Lskip_sme_fa64_\@: 337 338 // ZT0 available? 339 mrs_s x1, SYS_ID_AA64SMFR0_EL1 340 __check_override id_aa64smfr0, ID_AA64SMFR0_EL1_SMEver_SHIFT, 4, .Linit_sme_zt0_\@, .Lskip_sme_zt0_\@, x1, x2 341 .Linit_sme_zt0_\@: 342 orr x0, x0, SMCR_ELx_EZT0_MASK 343 .Lskip_sme_zt0_\@: 344 345 orr x0, x0, #SMCR_ELx_LEN_MASK // Enable full SME vector 346 msr_s SYS_SMCR_EL2, x0 // length for EL1. 347 348 mrs_s x1, SYS_SMIDR_EL1 // Priority mapping supported? 349 ubfx x1, x1, #SMIDR_EL1_SMPS_SHIFT, #1 350 cbz x1, .Lskip_sme_\@ 351 352 msr_s SYS_SMPRIMAP_EL2, xzr // Make all priorities equal 353 .Lskip_sme_\@: 354 .endm 355 356 #endif /* __ARM_KVM_INIT_H__ */ 357