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