1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * VGIC system registers handling functions for AArch64 mode 4 */ 5 6 #include <linux/irqchip/arm-gic-v3.h> 7 #include <linux/kvm.h> 8 #include <linux/kvm_host.h> 9 #include <asm/kvm_emulate.h> 10 #include "vgic/vgic.h" 11 #include "sys_regs.h" 12 13 static bool access_gic_ctlr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 14 const struct sys_reg_desc *r) 15 { 16 u32 host_pri_bits, host_id_bits, host_seis, host_a3v, seis, a3v; 17 struct vgic_cpu *vgic_v3_cpu = &vcpu->arch.vgic_cpu; 18 struct vgic_vmcr vmcr; 19 u64 val; 20 21 vgic_get_vmcr(vcpu, &vmcr); 22 if (p->is_write) { 23 val = p->regval; 24 25 /* 26 * Disallow restoring VM state if not supported by this 27 * hardware. 28 */ 29 host_pri_bits = ((val & ICC_CTLR_EL1_PRI_BITS_MASK) >> 30 ICC_CTLR_EL1_PRI_BITS_SHIFT) + 1; 31 if (host_pri_bits > vgic_v3_cpu->num_pri_bits) 32 return false; 33 34 vgic_v3_cpu->num_pri_bits = host_pri_bits; 35 36 host_id_bits = (val & ICC_CTLR_EL1_ID_BITS_MASK) >> 37 ICC_CTLR_EL1_ID_BITS_SHIFT; 38 if (host_id_bits > vgic_v3_cpu->num_id_bits) 39 return false; 40 41 vgic_v3_cpu->num_id_bits = host_id_bits; 42 43 host_seis = ((kvm_vgic_global_state.ich_vtr_el2 & 44 ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT); 45 seis = (val & ICC_CTLR_EL1_SEIS_MASK) >> 46 ICC_CTLR_EL1_SEIS_SHIFT; 47 if (host_seis != seis) 48 return false; 49 50 host_a3v = ((kvm_vgic_global_state.ich_vtr_el2 & 51 ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT); 52 a3v = (val & ICC_CTLR_EL1_A3V_MASK) >> ICC_CTLR_EL1_A3V_SHIFT; 53 if (host_a3v != a3v) 54 return false; 55 56 /* 57 * Here set VMCR.CTLR in ICC_CTLR_EL1 layout. 58 * The vgic_set_vmcr() will convert to ICH_VMCR layout. 59 */ 60 vmcr.cbpr = (val & ICC_CTLR_EL1_CBPR_MASK) >> ICC_CTLR_EL1_CBPR_SHIFT; 61 vmcr.eoim = (val & ICC_CTLR_EL1_EOImode_MASK) >> ICC_CTLR_EL1_EOImode_SHIFT; 62 vgic_set_vmcr(vcpu, &vmcr); 63 } else { 64 val = 0; 65 val |= (vgic_v3_cpu->num_pri_bits - 1) << 66 ICC_CTLR_EL1_PRI_BITS_SHIFT; 67 val |= vgic_v3_cpu->num_id_bits << ICC_CTLR_EL1_ID_BITS_SHIFT; 68 val |= ((kvm_vgic_global_state.ich_vtr_el2 & 69 ICH_VTR_SEIS_MASK) >> ICH_VTR_SEIS_SHIFT) << 70 ICC_CTLR_EL1_SEIS_SHIFT; 71 val |= ((kvm_vgic_global_state.ich_vtr_el2 & 72 ICH_VTR_A3V_MASK) >> ICH_VTR_A3V_SHIFT) << 73 ICC_CTLR_EL1_A3V_SHIFT; 74 /* 75 * The VMCR.CTLR value is in ICC_CTLR_EL1 layout. 76 * Extract it directly using ICC_CTLR_EL1 reg definitions. 77 */ 78 val |= (vmcr.cbpr << ICC_CTLR_EL1_CBPR_SHIFT) & ICC_CTLR_EL1_CBPR_MASK; 79 val |= (vmcr.eoim << ICC_CTLR_EL1_EOImode_SHIFT) & ICC_CTLR_EL1_EOImode_MASK; 80 81 p->regval = val; 82 } 83 84 return true; 85 } 86 87 static bool access_gic_pmr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 88 const struct sys_reg_desc *r) 89 { 90 struct vgic_vmcr vmcr; 91 92 vgic_get_vmcr(vcpu, &vmcr); 93 if (p->is_write) { 94 vmcr.pmr = (p->regval & ICC_PMR_EL1_MASK) >> ICC_PMR_EL1_SHIFT; 95 vgic_set_vmcr(vcpu, &vmcr); 96 } else { 97 p->regval = (vmcr.pmr << ICC_PMR_EL1_SHIFT) & ICC_PMR_EL1_MASK; 98 } 99 100 return true; 101 } 102 103 static bool access_gic_bpr0(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 104 const struct sys_reg_desc *r) 105 { 106 struct vgic_vmcr vmcr; 107 108 vgic_get_vmcr(vcpu, &vmcr); 109 if (p->is_write) { 110 vmcr.bpr = (p->regval & ICC_BPR0_EL1_MASK) >> 111 ICC_BPR0_EL1_SHIFT; 112 vgic_set_vmcr(vcpu, &vmcr); 113 } else { 114 p->regval = (vmcr.bpr << ICC_BPR0_EL1_SHIFT) & 115 ICC_BPR0_EL1_MASK; 116 } 117 118 return true; 119 } 120 121 static bool access_gic_bpr1(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 122 const struct sys_reg_desc *r) 123 { 124 struct vgic_vmcr vmcr; 125 126 if (!p->is_write) 127 p->regval = 0; 128 129 vgic_get_vmcr(vcpu, &vmcr); 130 if (!vmcr.cbpr) { 131 if (p->is_write) { 132 vmcr.abpr = (p->regval & ICC_BPR1_EL1_MASK) >> 133 ICC_BPR1_EL1_SHIFT; 134 vgic_set_vmcr(vcpu, &vmcr); 135 } else { 136 p->regval = (vmcr.abpr << ICC_BPR1_EL1_SHIFT) & 137 ICC_BPR1_EL1_MASK; 138 } 139 } else { 140 if (!p->is_write) 141 p->regval = min((vmcr.bpr + 1), 7U); 142 } 143 144 return true; 145 } 146 147 static bool access_gic_grpen0(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 148 const struct sys_reg_desc *r) 149 { 150 struct vgic_vmcr vmcr; 151 152 vgic_get_vmcr(vcpu, &vmcr); 153 if (p->is_write) { 154 vmcr.grpen0 = (p->regval & ICC_IGRPEN0_EL1_MASK) >> 155 ICC_IGRPEN0_EL1_SHIFT; 156 vgic_set_vmcr(vcpu, &vmcr); 157 } else { 158 p->regval = (vmcr.grpen0 << ICC_IGRPEN0_EL1_SHIFT) & 159 ICC_IGRPEN0_EL1_MASK; 160 } 161 162 return true; 163 } 164 165 static bool access_gic_grpen1(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 166 const struct sys_reg_desc *r) 167 { 168 struct vgic_vmcr vmcr; 169 170 vgic_get_vmcr(vcpu, &vmcr); 171 if (p->is_write) { 172 vmcr.grpen1 = (p->regval & ICC_IGRPEN1_EL1_MASK) >> 173 ICC_IGRPEN1_EL1_SHIFT; 174 vgic_set_vmcr(vcpu, &vmcr); 175 } else { 176 p->regval = (vmcr.grpen1 << ICC_IGRPEN1_EL1_SHIFT) & 177 ICC_IGRPEN1_EL1_MASK; 178 } 179 180 return true; 181 } 182 183 static void vgic_v3_access_apr_reg(struct kvm_vcpu *vcpu, 184 struct sys_reg_params *p, u8 apr, u8 idx) 185 { 186 struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3; 187 uint32_t *ap_reg; 188 189 if (apr) 190 ap_reg = &vgicv3->vgic_ap1r[idx]; 191 else 192 ap_reg = &vgicv3->vgic_ap0r[idx]; 193 194 if (p->is_write) 195 *ap_reg = p->regval; 196 else 197 p->regval = *ap_reg; 198 } 199 200 static bool access_gic_aprn(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 201 const struct sys_reg_desc *r, u8 apr) 202 { 203 u8 idx = r->Op2 & 3; 204 205 if (idx > vgic_v3_max_apr_idx(vcpu)) 206 goto err; 207 208 vgic_v3_access_apr_reg(vcpu, p, apr, idx); 209 return true; 210 err: 211 if (!p->is_write) 212 p->regval = 0; 213 214 return false; 215 } 216 217 static bool access_gic_ap0r(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 218 const struct sys_reg_desc *r) 219 220 { 221 return access_gic_aprn(vcpu, p, r, 0); 222 } 223 224 static bool access_gic_ap1r(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 225 const struct sys_reg_desc *r) 226 { 227 return access_gic_aprn(vcpu, p, r, 1); 228 } 229 230 static bool access_gic_sre(struct kvm_vcpu *vcpu, struct sys_reg_params *p, 231 const struct sys_reg_desc *r) 232 { 233 struct vgic_v3_cpu_if *vgicv3 = &vcpu->arch.vgic_cpu.vgic_v3; 234 235 /* Validate SRE bit */ 236 if (p->is_write) { 237 if (!(p->regval & ICC_SRE_EL1_SRE)) 238 return false; 239 } else { 240 p->regval = vgicv3->vgic_sre; 241 } 242 243 return true; 244 } 245 static const struct sys_reg_desc gic_v3_icc_reg_descs[] = { 246 { SYS_DESC(SYS_ICC_PMR_EL1), access_gic_pmr }, 247 { SYS_DESC(SYS_ICC_BPR0_EL1), access_gic_bpr0 }, 248 { SYS_DESC(SYS_ICC_AP0R0_EL1), access_gic_ap0r }, 249 { SYS_DESC(SYS_ICC_AP0R1_EL1), access_gic_ap0r }, 250 { SYS_DESC(SYS_ICC_AP0R2_EL1), access_gic_ap0r }, 251 { SYS_DESC(SYS_ICC_AP0R3_EL1), access_gic_ap0r }, 252 { SYS_DESC(SYS_ICC_AP1R0_EL1), access_gic_ap1r }, 253 { SYS_DESC(SYS_ICC_AP1R1_EL1), access_gic_ap1r }, 254 { SYS_DESC(SYS_ICC_AP1R2_EL1), access_gic_ap1r }, 255 { SYS_DESC(SYS_ICC_AP1R3_EL1), access_gic_ap1r }, 256 { SYS_DESC(SYS_ICC_BPR1_EL1), access_gic_bpr1 }, 257 { SYS_DESC(SYS_ICC_CTLR_EL1), access_gic_ctlr }, 258 { SYS_DESC(SYS_ICC_SRE_EL1), access_gic_sre }, 259 { SYS_DESC(SYS_ICC_IGRPEN0_EL1), access_gic_grpen0 }, 260 { SYS_DESC(SYS_ICC_IGRPEN1_EL1), access_gic_grpen1 }, 261 }; 262 263 int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, bool is_write, u64 id, 264 u64 *reg) 265 { 266 struct sys_reg_params params; 267 u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64; 268 269 params.regval = *reg; 270 params.is_write = is_write; 271 272 if (find_reg_by_id(sysreg, ¶ms, gic_v3_icc_reg_descs, 273 ARRAY_SIZE(gic_v3_icc_reg_descs))) 274 return 0; 275 276 return -ENXIO; 277 } 278 279 int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu, bool is_write, u64 id, 280 u64 *reg) 281 { 282 struct sys_reg_params params; 283 const struct sys_reg_desc *r; 284 u64 sysreg = (id & KVM_DEV_ARM_VGIC_SYSREG_MASK) | KVM_REG_SIZE_U64; 285 286 if (is_write) 287 params.regval = *reg; 288 params.is_write = is_write; 289 290 r = find_reg_by_id(sysreg, ¶ms, gic_v3_icc_reg_descs, 291 ARRAY_SIZE(gic_v3_icc_reg_descs)); 292 if (!r) 293 return -ENXIO; 294 295 if (!r->access(vcpu, ¶ms, r)) 296 return -EINVAL; 297 298 if (!is_write) 299 *reg = params.regval; 300 301 return 0; 302 } 303