1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2019 Western Digital Corporation or its affiliates. 4 * 5 * Authors: 6 * Anup Patel <anup.patel@wdc.com> 7 */ 8 9 #ifndef __RISCV_KVM_HOST_H__ 10 #define __RISCV_KVM_HOST_H__ 11 12 #include <linux/types.h> 13 #include <linux/kvm.h> 14 #include <linux/kvm_types.h> 15 #include <linux/spinlock.h> 16 #include <asm/hwcap.h> 17 #include <asm/kvm_aia.h> 18 #include <asm/ptrace.h> 19 #include <asm/kvm_tlb.h> 20 #include <asm/kvm_vmid.h> 21 #include <asm/kvm_vcpu_fp.h> 22 #include <asm/kvm_vcpu_insn.h> 23 #include <asm/kvm_vcpu_sbi.h> 24 #include <asm/kvm_vcpu_sbi_fwft.h> 25 #include <asm/kvm_vcpu_timer.h> 26 #include <asm/kvm_vcpu_pmu.h> 27 28 #define KVM_MAX_VCPUS 1024 29 30 #define KVM_HALT_POLL_NS_DEFAULT 500000 31 32 #define KVM_VCPU_MAX_FEATURES 0 33 34 #define KVM_IRQCHIP_NUM_PINS 1024 35 36 #define KVM_REQ_SLEEP \ 37 KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) 38 #define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(1) 39 #define KVM_REQ_UPDATE_HGATP KVM_ARCH_REQ(2) 40 #define KVM_REQ_FENCE_I \ 41 KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) 42 #define KVM_REQ_HFENCE_VVMA_ALL \ 43 KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) 44 #define KVM_REQ_HFENCE \ 45 KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) 46 #define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(6) 47 48 #define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE 49 50 #define KVM_HEDELEG_DEFAULT (BIT(EXC_INST_MISALIGNED) | \ 51 BIT(EXC_INST_ILLEGAL) | \ 52 BIT(EXC_BREAKPOINT) | \ 53 BIT(EXC_SYSCALL) | \ 54 BIT(EXC_INST_PAGE_FAULT) | \ 55 BIT(EXC_LOAD_PAGE_FAULT) | \ 56 BIT(EXC_STORE_PAGE_FAULT)) 57 58 #define KVM_HIDELEG_DEFAULT (BIT(IRQ_VS_SOFT) | \ 59 BIT(IRQ_VS_TIMER) | \ 60 BIT(IRQ_VS_EXT)) 61 62 #define KVM_DIRTY_LOG_MANUAL_CAPS (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \ 63 KVM_DIRTY_LOG_INITIALLY_SET) 64 65 struct kvm_vm_stat { 66 struct kvm_vm_stat_generic generic; 67 }; 68 69 struct kvm_vcpu_stat { 70 struct kvm_vcpu_stat_generic generic; 71 u64 ecall_exit_stat; 72 u64 wfi_exit_stat; 73 u64 wrs_exit_stat; 74 u64 mmio_exit_user; 75 u64 mmio_exit_kernel; 76 u64 csr_exit_user; 77 u64 csr_exit_kernel; 78 u64 signal_exits; 79 u64 exits; 80 u64 instr_illegal_exits; 81 u64 load_misaligned_exits; 82 u64 store_misaligned_exits; 83 u64 load_access_exits; 84 u64 store_access_exits; 85 }; 86 87 struct kvm_arch_memory_slot { 88 }; 89 90 struct kvm_arch { 91 /* G-stage vmid */ 92 struct kvm_vmid vmid; 93 94 /* G-stage page table */ 95 pgd_t *pgd; 96 phys_addr_t pgd_phys; 97 98 /* Guest Timer */ 99 struct kvm_guest_timer timer; 100 101 /* AIA Guest/VM context */ 102 struct kvm_aia aia; 103 104 /* KVM_CAP_RISCV_MP_STATE_RESET */ 105 bool mp_state_reset; 106 }; 107 108 struct kvm_cpu_trap { 109 unsigned long sepc; 110 unsigned long scause; 111 unsigned long stval; 112 unsigned long htval; 113 unsigned long htinst; 114 }; 115 116 struct kvm_cpu_context { 117 unsigned long zero; 118 unsigned long ra; 119 unsigned long sp; 120 unsigned long gp; 121 unsigned long tp; 122 unsigned long t0; 123 unsigned long t1; 124 unsigned long t2; 125 unsigned long s0; 126 unsigned long s1; 127 unsigned long a0; 128 unsigned long a1; 129 unsigned long a2; 130 unsigned long a3; 131 unsigned long a4; 132 unsigned long a5; 133 unsigned long a6; 134 unsigned long a7; 135 unsigned long s2; 136 unsigned long s3; 137 unsigned long s4; 138 unsigned long s5; 139 unsigned long s6; 140 unsigned long s7; 141 unsigned long s8; 142 unsigned long s9; 143 unsigned long s10; 144 unsigned long s11; 145 unsigned long t3; 146 unsigned long t4; 147 unsigned long t5; 148 unsigned long t6; 149 unsigned long sepc; 150 unsigned long sstatus; 151 unsigned long hstatus; 152 union __riscv_fp_state fp; 153 struct __riscv_v_ext_state vector; 154 }; 155 156 struct kvm_vcpu_csr { 157 unsigned long vsstatus; 158 unsigned long vsie; 159 unsigned long vstvec; 160 unsigned long vsscratch; 161 unsigned long vsepc; 162 unsigned long vscause; 163 unsigned long vstval; 164 unsigned long hvip; 165 unsigned long vsatp; 166 unsigned long scounteren; 167 unsigned long senvcfg; 168 }; 169 170 struct kvm_vcpu_config { 171 u64 henvcfg; 172 u64 hstateen0; 173 unsigned long hedeleg; 174 }; 175 176 struct kvm_vcpu_smstateen_csr { 177 unsigned long sstateen0; 178 }; 179 180 struct kvm_vcpu_reset_state { 181 spinlock_t lock; 182 unsigned long pc; 183 unsigned long a1; 184 }; 185 186 struct kvm_vcpu_arch { 187 /* VCPU ran at least once */ 188 bool ran_atleast_once; 189 190 /* Last Host CPU on which Guest VCPU exited */ 191 int last_exit_cpu; 192 193 /* ISA feature bits (similar to MISA) */ 194 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX); 195 196 /* Vendor, Arch, and Implementation details */ 197 unsigned long mvendorid; 198 unsigned long marchid; 199 unsigned long mimpid; 200 201 /* SSCRATCH, STVEC, and SCOUNTEREN of Host */ 202 unsigned long host_sscratch; 203 unsigned long host_stvec; 204 unsigned long host_scounteren; 205 unsigned long host_senvcfg; 206 unsigned long host_sstateen0; 207 208 /* CPU context of Host */ 209 struct kvm_cpu_context host_context; 210 211 /* CPU context of Guest VCPU */ 212 struct kvm_cpu_context guest_context; 213 214 /* CPU CSR context of Guest VCPU */ 215 struct kvm_vcpu_csr guest_csr; 216 217 /* CPU Smstateen CSR context of Guest VCPU */ 218 struct kvm_vcpu_smstateen_csr smstateen_csr; 219 220 /* CPU reset state of Guest VCPU */ 221 struct kvm_vcpu_reset_state reset_state; 222 223 /* 224 * VCPU interrupts 225 * 226 * We have a lockless approach for tracking pending VCPU interrupts 227 * implemented using atomic bitops. The irqs_pending bitmap represent 228 * pending interrupts whereas irqs_pending_mask represent bits changed 229 * in irqs_pending. Our approach is modeled around multiple producer 230 * and single consumer problem where the consumer is the VCPU itself. 231 */ 232 #define KVM_RISCV_VCPU_NR_IRQS 64 233 DECLARE_BITMAP(irqs_pending, KVM_RISCV_VCPU_NR_IRQS); 234 DECLARE_BITMAP(irqs_pending_mask, KVM_RISCV_VCPU_NR_IRQS); 235 236 /* VCPU Timer */ 237 struct kvm_vcpu_timer timer; 238 239 /* HFENCE request queue */ 240 spinlock_t hfence_lock; 241 unsigned long hfence_head; 242 unsigned long hfence_tail; 243 struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE]; 244 245 /* MMIO instruction details */ 246 struct kvm_mmio_decode mmio_decode; 247 248 /* CSR instruction details */ 249 struct kvm_csr_decode csr_decode; 250 251 /* SBI context */ 252 struct kvm_vcpu_sbi_context sbi_context; 253 254 /* AIA VCPU context */ 255 struct kvm_vcpu_aia aia_context; 256 257 /* Cache pages needed to program page tables with spinlock held */ 258 struct kvm_mmu_memory_cache mmu_page_cache; 259 260 /* VCPU power state */ 261 struct kvm_mp_state mp_state; 262 spinlock_t mp_state_lock; 263 264 /* Don't run the VCPU (blocked) */ 265 bool pause; 266 267 /* Performance monitoring context */ 268 struct kvm_pmu pmu_context; 269 270 /* Firmware feature SBI extension context */ 271 struct kvm_sbi_fwft fwft_context; 272 273 /* 'static' configurations which are set only once */ 274 struct kvm_vcpu_config cfg; 275 276 /* SBI steal-time accounting */ 277 struct { 278 gpa_t shmem; 279 u64 last_steal; 280 } sta; 281 }; 282 283 /* 284 * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event, 285 * arrived in guest context. For riscv, any event that arrives while a vCPU is 286 * loaded is considered to be "in guest". 287 */ 288 static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) 289 { 290 return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu; 291 } 292 293 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} 294 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} 295 296 int kvm_riscv_setup_default_irq_routing(struct kvm *kvm, u32 lines); 297 298 void __kvm_riscv_unpriv_trap(void); 299 300 unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu, 301 bool read_insn, 302 unsigned long guest_addr, 303 struct kvm_cpu_trap *trap); 304 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu, 305 struct kvm_cpu_trap *trap); 306 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, 307 struct kvm_cpu_trap *trap); 308 309 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch); 310 311 void kvm_riscv_vcpu_setup_isa(struct kvm_vcpu *vcpu); 312 unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu); 313 int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu, 314 u64 __user *uindices); 315 int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu, 316 const struct kvm_one_reg *reg); 317 int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu, 318 const struct kvm_one_reg *reg); 319 320 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); 321 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); 322 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu); 323 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu); 324 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask); 325 void __kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); 326 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); 327 void __kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); 328 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); 329 bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu); 330 331 void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu); 332 333 /* Flags representing implementation specific details */ 334 DECLARE_STATIC_KEY_FALSE(kvm_riscv_vsstage_tlb_no_gpa); 335 336 #endif /* __RISCV_KVM_HOST_H__ */ 337