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