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 .Lset_debug_fgt_\@ 169 /* Disable PMSNEVFR_EL1 read and write traps */ 170 orr x0, x0, #(1 << 62) 171 172 .Lset_debug_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, .Lset_pie_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 .Lset_pie_fgt_\@: 186 mrs_s x1, SYS_ID_AA64MMFR3_EL1 187 ubfx x1, x1, #ID_AA64MMFR3_EL1_S1PIE_SHIFT, #4 188 cbz x1, .Lset_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 .Lset_fgt_\@: 195 msr_s SYS_HFGRTR_EL2, x0 196 msr_s SYS_HFGWTR_EL2, x0 197 msr_s SYS_HFGITR_EL2, xzr 198 199 mrs x1, id_aa64pfr0_el1 // AMU traps UNDEF without AMU 200 ubfx x1, x1, #ID_AA64PFR0_EL1_AMU_SHIFT, #4 201 cbz x1, .Lskip_fgt_\@ 202 203 msr_s SYS_HAFGRTR_EL2, xzr 204 .Lskip_fgt_\@: 205 .endm 206 207 .macro __init_el2_nvhe_prepare_eret 208 mov x0, #INIT_PSTATE_EL1 209 msr spsr_el2, x0 210 .endm 211 212 /** 213 * Initialize EL2 registers to sane values. This should be called early on all 214 * cores that were booted in EL2. Note that everything gets initialised as 215 * if VHE was not available. The kernel context will be upgraded to VHE 216 * if possible later on in the boot process 217 * 218 * Regs: x0, x1 and x2 are clobbered. 219 */ 220 .macro init_el2_state 221 __init_el2_sctlr 222 __init_el2_hcrx 223 __init_el2_timers 224 __init_el2_debug 225 __init_el2_lor 226 __init_el2_stage2 227 __init_el2_gicv3 228 __init_el2_hstr 229 __init_el2_nvhe_idregs 230 __init_el2_cptr 231 __init_el2_fgt 232 .endm 233 234 #ifndef __KVM_NVHE_HYPERVISOR__ 235 // This will clobber tmp1 and tmp2, and expect tmp1 to contain 236 // the id register value as read from the HW 237 .macro __check_override idreg, fld, width, pass, fail, tmp1, tmp2 238 ubfx \tmp1, \tmp1, #\fld, #\width 239 cbz \tmp1, \fail 240 241 adr_l \tmp1, \idreg\()_override 242 ldr \tmp2, [\tmp1, FTR_OVR_VAL_OFFSET] 243 ldr \tmp1, [\tmp1, FTR_OVR_MASK_OFFSET] 244 ubfx \tmp2, \tmp2, #\fld, #\width 245 ubfx \tmp1, \tmp1, #\fld, #\width 246 cmp \tmp1, xzr 247 and \tmp2, \tmp2, \tmp1 248 csinv \tmp2, \tmp2, xzr, ne 249 cbnz \tmp2, \pass 250 b \fail 251 .endm 252 253 // This will clobber tmp1 and tmp2 254 .macro check_override idreg, fld, pass, fail, tmp1, tmp2 255 mrs \tmp1, \idreg\()_el1 256 __check_override \idreg \fld 4 \pass \fail \tmp1 \tmp2 257 .endm 258 #else 259 // This will clobber tmp 260 .macro __check_override idreg, fld, width, pass, fail, tmp, ignore 261 ldr_l \tmp, \idreg\()_el1_sys_val 262 ubfx \tmp, \tmp, #\fld, #\width 263 cbnz \tmp, \pass 264 b \fail 265 .endm 266 267 .macro check_override idreg, fld, pass, fail, tmp, ignore 268 __check_override \idreg \fld 4 \pass \fail \tmp \ignore 269 .endm 270 #endif 271 272 .macro finalise_el2_state 273 check_override id_aa64pfr0, ID_AA64PFR0_EL1_SVE_SHIFT, .Linit_sve_\@, .Lskip_sve_\@, x1, x2 274 275 .Linit_sve_\@: /* SVE register access */ 276 __check_hvhe .Lcptr_nvhe_\@, x1 277 278 // (h)VHE case 279 mrs x0, cpacr_el1 // Disable SVE traps 280 orr x0, x0, #CPACR_ELx_ZEN 281 msr cpacr_el1, x0 282 b .Lskip_set_cptr_\@ 283 284 .Lcptr_nvhe_\@: // nVHE case 285 mrs x0, cptr_el2 // Disable SVE traps 286 bic x0, x0, #CPTR_EL2_TZ 287 msr cptr_el2, x0 288 .Lskip_set_cptr_\@: 289 isb 290 mov x1, #ZCR_ELx_LEN_MASK // SVE: Enable full vector 291 msr_s SYS_ZCR_EL2, x1 // length for EL1. 292 293 .Lskip_sve_\@: 294 check_override id_aa64pfr1, ID_AA64PFR1_EL1_SME_SHIFT, .Linit_sme_\@, .Lskip_sme_\@, x1, x2 295 296 .Linit_sme_\@: /* SME register access and priority mapping */ 297 __check_hvhe .Lcptr_nvhe_sme_\@, x1 298 299 // (h)VHE case 300 mrs x0, cpacr_el1 // Disable SME traps 301 orr x0, x0, #CPACR_ELx_SMEN 302 msr cpacr_el1, x0 303 b .Lskip_set_cptr_sme_\@ 304 305 .Lcptr_nvhe_sme_\@: // nVHE case 306 mrs x0, cptr_el2 // Disable SME traps 307 bic x0, x0, #CPTR_EL2_TSM 308 msr cptr_el2, x0 309 .Lskip_set_cptr_sme_\@: 310 isb 311 312 mrs x1, sctlr_el2 313 orr x1, x1, #SCTLR_ELx_ENTP2 // Disable TPIDR2 traps 314 msr sctlr_el2, x1 315 isb 316 317 mov x0, #0 // SMCR controls 318 319 // Full FP in SM? 320 mrs_s x1, SYS_ID_AA64SMFR0_EL1 321 __check_override id_aa64smfr0, ID_AA64SMFR0_EL1_FA64_SHIFT, 1, .Linit_sme_fa64_\@, .Lskip_sme_fa64_\@, x1, x2 322 323 .Linit_sme_fa64_\@: 324 orr x0, x0, SMCR_ELx_FA64_MASK 325 .Lskip_sme_fa64_\@: 326 327 // ZT0 available? 328 mrs_s x1, SYS_ID_AA64SMFR0_EL1 329 __check_override id_aa64smfr0, ID_AA64SMFR0_EL1_SMEver_SHIFT, 4, .Linit_sme_zt0_\@, .Lskip_sme_zt0_\@, x1, x2 330 .Linit_sme_zt0_\@: 331 orr x0, x0, SMCR_ELx_EZT0_MASK 332 .Lskip_sme_zt0_\@: 333 334 orr x0, x0, #SMCR_ELx_LEN_MASK // Enable full SME vector 335 msr_s SYS_SMCR_EL2, x0 // length for EL1. 336 337 mrs_s x1, SYS_SMIDR_EL1 // Priority mapping supported? 338 ubfx x1, x1, #SMIDR_EL1_SMPS_SHIFT, #1 339 cbz x1, .Lskip_sme_\@ 340 341 msr_s SYS_SMPRIMAP_EL2, xzr // Make all priorities equal 342 .Lskip_sme_\@: 343 .endm 344 345 #endif /* __ARM_KVM_INIT_H__ */ 346
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.