1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited 4 */ 5 6 #ifndef __ASM_LOONGARCH_KVM_HOST_H__ 7 #define __ASM_LOONGARCH_KVM_HOST_H__ 8 9 #include <linux/cpumask.h> 10 #include <linux/hrtimer.h> 11 #include <linux/interrupt.h> 12 #include <linux/kvm.h> 13 #include <linux/kvm_types.h> 14 #include <linux/mutex.h> 15 #include <linux/perf_event.h> 16 #include <linux/spinlock.h> 17 #include <linux/threads.h> 18 #include <linux/types.h> 19 20 #include <asm/inst.h> 21 #include <asm/kvm_mmu.h> 22 #include <asm/kvm_ipi.h> 23 #include <asm/kvm_eiointc.h> 24 #include <asm/kvm_pch_pic.h> 25 #include <asm/loongarch.h> 26 27 #define __KVM_HAVE_ARCH_INTC_INITIALIZED 28 29 /* Loongarch KVM register ids */ 30 #define KVM_GET_IOC_CSR_IDX(id) ((id & KVM_CSR_IDX_MASK) >> LOONGARCH_REG_SHIFT) 31 #define KVM_GET_IOC_CPUCFG_IDX(id) ((id & KVM_CPUCFG_IDX_MASK) >> LOONGARCH_REG_SHIFT) 32 33 #define KVM_MAX_VCPUS 256 34 #define KVM_MAX_CPUCFG_REGS 21 35 36 #define KVM_HALT_POLL_NS_DEFAULT 500000 37 #define KVM_REQ_TLB_FLUSH_GPA KVM_ARCH_REQ(0) 38 #define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(1) 39 #define KVM_REQ_PMU KVM_ARCH_REQ(2) 40 41 #define KVM_GUESTDBG_SW_BP_MASK \ 42 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP) 43 #define KVM_GUESTDBG_VALID_MASK \ 44 (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP | KVM_GUESTDBG_SINGLESTEP) 45 46 #define KVM_DIRTY_LOG_MANUAL_CAPS \ 47 (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | KVM_DIRTY_LOG_INITIALLY_SET) 48 49 struct kvm_vm_stat { 50 struct kvm_vm_stat_generic generic; 51 u64 pages; 52 u64 hugepages; 53 }; 54 55 struct kvm_vcpu_stat { 56 struct kvm_vcpu_stat_generic generic; 57 u64 int_exits; 58 u64 idle_exits; 59 u64 cpucfg_exits; 60 u64 signal_exits; 61 u64 hypercall_exits; 62 u64 ipi_read_exits; 63 u64 ipi_write_exits; 64 u64 eiointc_read_exits; 65 u64 eiointc_write_exits; 66 u64 pch_pic_read_exits; 67 u64 pch_pic_write_exits; 68 }; 69 70 #define KVM_MEM_HUGEPAGE_CAPABLE (1UL << 0) 71 #define KVM_MEM_HUGEPAGE_INCAPABLE (1UL << 1) 72 struct kvm_arch_memory_slot { 73 unsigned long flags; 74 }; 75 76 #define HOST_MAX_PMNUM 16 77 struct kvm_context { 78 unsigned long vpid_cache; 79 struct kvm_vcpu *last_vcpu; 80 /* Host PMU CSR */ 81 u64 perf_ctrl[HOST_MAX_PMNUM]; 82 u64 perf_cntr[HOST_MAX_PMNUM]; 83 }; 84 85 struct kvm_world_switch { 86 int (*exc_entry)(void); 87 int (*enter_guest)(struct kvm_run *run, struct kvm_vcpu *vcpu); 88 unsigned long page_order; 89 }; 90 91 #define MAX_PGTABLE_LEVELS 4 92 93 /* 94 * Physical CPUID is used for interrupt routing, there are different 95 * definitions about physical cpuid on different hardwares. 96 * 97 * For LOONGARCH_CSR_CPUID register, max CPUID size if 512 98 * For IPI hardware, max destination CPUID size 1024 99 * For eiointc interrupt controller, max destination CPUID size is 256 100 * For msgint interrupt controller, max supported CPUID size is 65536 101 * 102 * Currently max CPUID is defined as 256 for KVM hypervisor, in future 103 * it will be expanded to 4096, including 16 packages at most. And every 104 * package supports at most 256 vcpus 105 */ 106 #define KVM_MAX_PHYID 256 107 108 struct kvm_phyid_info { 109 struct kvm_vcpu *vcpu; 110 bool enabled; 111 }; 112 113 struct kvm_phyid_map { 114 int max_phyid; 115 struct kvm_phyid_info phys_map[KVM_MAX_PHYID]; 116 }; 117 118 struct kvm_arch { 119 /* Guest physical mm */ 120 kvm_pte_t *pgd; 121 unsigned long gpa_size; 122 unsigned long invalid_ptes[MAX_PGTABLE_LEVELS]; 123 unsigned int pte_shifts[MAX_PGTABLE_LEVELS]; 124 unsigned int root_level; 125 spinlock_t phyid_map_lock; 126 struct kvm_phyid_map *phyid_map; 127 /* Enabled PV features */ 128 unsigned long pv_features; 129 /* Supported KVM features */ 130 unsigned long kvm_features; 131 132 s64 time_offset; 133 struct kvm_context __percpu *vmcs; 134 struct loongarch_ipi *ipi; 135 struct loongarch_eiointc *eiointc; 136 struct loongarch_pch_pic *pch_pic; 137 }; 138 139 #define CSR_MAX_NUMS 0x800 140 141 struct loongarch_csrs { 142 unsigned long csrs[CSR_MAX_NUMS]; 143 }; 144 145 /* Resume Flags */ 146 #define RESUME_HOST 0 147 #define RESUME_GUEST 1 148 149 enum emulation_result { 150 EMULATE_DONE, /* no further processing */ 151 EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */ 152 EMULATE_DO_IOCSR, /* handle IOCSR request */ 153 EMULATE_FAIL, /* can't emulate this instruction */ 154 EMULATE_EXCEPT, /* A guest exception has been generated */ 155 }; 156 157 #define KVM_LARCH_FPU (0x1 << 0) 158 #define KVM_LARCH_LSX (0x1 << 1) 159 #define KVM_LARCH_LASX (0x1 << 2) 160 #define KVM_LARCH_LBT (0x1 << 3) 161 #define KVM_LARCH_PMU (0x1 << 4) 162 #define KVM_LARCH_SWCSR_LATEST (0x1 << 5) 163 #define KVM_LARCH_HWCSR_USABLE (0x1 << 6) 164 165 #define LOONGARCH_PV_FEAT_UPDATED BIT_ULL(63) 166 #define LOONGARCH_PV_FEAT_MASK (BIT(KVM_FEATURE_IPI) | \ 167 BIT(KVM_FEATURE_STEAL_TIME) | \ 168 BIT(KVM_FEATURE_USER_HCALL) | \ 169 BIT(KVM_FEATURE_VIRT_EXTIOI)) 170 171 struct kvm_vcpu_arch { 172 /* 173 * Switch pointer-to-function type to unsigned long 174 * for loading the value into register directly. 175 */ 176 unsigned long host_eentry; 177 unsigned long guest_eentry; 178 179 /* Pointers stored here for easy accessing from assembly code */ 180 int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu); 181 182 /* GPA (=HVA) of PGD for secondary mmu */ 183 unsigned long kvm_pgd; 184 185 /* Host registers preserved across guest mode execution */ 186 unsigned long host_sp; 187 unsigned long host_tp; 188 unsigned long host_pgd; 189 190 /* Host CSRs are used when handling exits from guest */ 191 unsigned long badi; 192 unsigned long badv; 193 unsigned long host_ecfg; 194 unsigned long host_estat; 195 unsigned long host_percpu; 196 197 /* GPRs */ 198 unsigned long gprs[32]; 199 unsigned long pc; 200 201 /* Which auxiliary state is loaded (KVM_LARCH_*) */ 202 unsigned int aux_inuse; 203 204 /* FPU state */ 205 struct loongarch_fpu fpu FPU_ALIGN; 206 struct loongarch_lbt lbt; 207 208 /* CSR state */ 209 struct loongarch_csrs *csr; 210 211 /* Guest max PMU CSR id */ 212 int max_pmu_csrid; 213 214 /* GPR used as IO source/target */ 215 u32 io_gpr; 216 217 /* KVM register to control count timer */ 218 u32 count_ctl; 219 struct hrtimer swtimer; 220 221 /* Bitmask of intr that are pending */ 222 unsigned long irq_pending; 223 /* Bitmask of pending intr to be cleared */ 224 unsigned long irq_clear; 225 226 /* Bitmask of exceptions that are pending */ 227 unsigned long exception_pending; 228 unsigned int esubcode; 229 230 /* Cache for pages needed inside spinlock regions */ 231 struct kvm_mmu_memory_cache mmu_page_cache; 232 233 /* vcpu's vpid */ 234 u64 vpid; 235 gpa_t flush_gpa; 236 237 /* Frequency of stable timer in Hz */ 238 u64 timer_mhz; 239 ktime_t expire; 240 241 /* Last CPU the vCPU state was loaded on */ 242 int last_sched_cpu; 243 /* mp state */ 244 struct kvm_mp_state mp_state; 245 /* ipi state */ 246 struct ipi_state ipi_state; 247 /* cpucfg */ 248 u32 cpucfg[KVM_MAX_CPUCFG_REGS]; 249 250 /* paravirt steal time */ 251 struct { 252 u64 guest_addr; 253 u64 last_steal; 254 struct gfn_to_hva_cache cache; 255 } st; 256 }; 257 258 static inline unsigned long readl_sw_gcsr(struct loongarch_csrs *csr, int reg) 259 { 260 return csr->csrs[reg]; 261 } 262 263 static inline void writel_sw_gcsr(struct loongarch_csrs *csr, int reg, unsigned long val) 264 { 265 csr->csrs[reg] = val; 266 } 267 268 static inline bool kvm_guest_has_fpu(struct kvm_vcpu_arch *arch) 269 { 270 return arch->cpucfg[2] & CPUCFG2_FP; 271 } 272 273 static inline bool kvm_guest_has_lsx(struct kvm_vcpu_arch *arch) 274 { 275 return arch->cpucfg[2] & CPUCFG2_LSX; 276 } 277 278 static inline bool kvm_guest_has_lasx(struct kvm_vcpu_arch *arch) 279 { 280 return arch->cpucfg[2] & CPUCFG2_LASX; 281 } 282 283 static inline bool kvm_guest_has_lbt(struct kvm_vcpu_arch *arch) 284 { 285 return arch->cpucfg[2] & (CPUCFG2_X86BT | CPUCFG2_ARMBT | CPUCFG2_MIPSBT); 286 } 287 288 static inline bool kvm_guest_has_pmu(struct kvm_vcpu_arch *arch) 289 { 290 return arch->cpucfg[6] & CPUCFG6_PMP; 291 } 292 293 static inline int kvm_get_pmu_num(struct kvm_vcpu_arch *arch) 294 { 295 return (arch->cpucfg[6] & CPUCFG6_PMNUM) >> CPUCFG6_PMNUM_SHIFT; 296 } 297 298 /* Check whether KVM support this feature (VMM may disable it) */ 299 static inline bool kvm_vm_support(struct kvm_arch *arch, int feature) 300 { 301 return !!(arch->kvm_features & BIT_ULL(feature)); 302 } 303 304 bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu); 305 306 /* Debug: dump vcpu state */ 307 int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu); 308 309 /* MMU handling */ 310 void kvm_flush_tlb_all(void); 311 void kvm_flush_tlb_gpa(struct kvm_vcpu *vcpu, unsigned long gpa); 312 int kvm_handle_mm_fault(struct kvm_vcpu *vcpu, unsigned long badv, bool write, int ecode); 313 314 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end, bool blockable); 315 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end); 316 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); 317 318 static inline void update_pc(struct kvm_vcpu_arch *arch) 319 { 320 arch->pc += 4; 321 } 322 323 /* 324 * kvm_is_ifetch_fault() - Find whether a TLBL exception is due to ifetch fault. 325 * @vcpu: Virtual CPU. 326 * 327 * Returns: Whether the TLBL exception was likely due to an instruction 328 * fetch fault rather than a data load fault. 329 */ 330 static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *arch) 331 { 332 return arch->pc == arch->badv; 333 } 334 335 /* Misc */ 336 static inline void kvm_arch_hardware_unsetup(void) {} 337 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {} 338 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {} 339 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {} 340 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {} 341 static inline void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) {} 342 void kvm_check_vpid(struct kvm_vcpu *vcpu); 343 enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer); 344 void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm, const struct kvm_memory_slot *memslot); 345 void kvm_init_vmcs(struct kvm *kvm); 346 void kvm_exc_entry(void); 347 int kvm_enter_guest(struct kvm_run *run, struct kvm_vcpu *vcpu); 348 349 extern unsigned long vpid_mask; 350 extern const unsigned long kvm_exception_size; 351 extern const unsigned long kvm_enter_guest_size; 352 extern struct kvm_world_switch *kvm_loongarch_ops; 353 354 #define SW_GCSR (1 << 0) 355 #define HW_GCSR (1 << 1) 356 #define INVALID_GCSR (1 << 2) 357 358 int get_gcsr_flag(int csr); 359 void set_hw_gcsr(int csr_id, unsigned long val); 360 361 #endif /* __ASM_LOONGARCH_KVM_HOST_H__ */ 362