arch/riscv/include/asm/kvm_host.h

   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/kvm_vcpu_fp.h>
  19 #include <asm/kvm_vcpu_insn.h>
  20 #include <asm/kvm_vcpu_sbi.h>
  21 #include <asm/kvm_vcpu_timer.h>
  22 #include <asm/kvm_vcpu_pmu.h>
  23
  24 #define KVM_MAX_VCPUS                   1024
  25
  26 #define KVM_HALT_POLL_NS_DEFAULT        500000
  27
  28 #define KVM_VCPU_MAX_FEATURES           0
  29
  30 #define KVM_REQ_SLEEP \
  31         KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  32 #define KVM_REQ_VCPU_RESET              KVM_ARCH_REQ(1)
  33 #define KVM_REQ_UPDATE_HGATP            KVM_ARCH_REQ(2)
  34 #define KVM_REQ_FENCE_I                 \
  35         KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  36 #define KVM_REQ_HFENCE_GVMA_VMID_ALL    KVM_REQ_TLB_FLUSH
  37 #define KVM_REQ_HFENCE_VVMA_ALL         \
  38         KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  39 #define KVM_REQ_HFENCE                  \
  40         KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  41
  42 enum kvm_riscv_hfence_type {
  43         KVM_RISCV_HFENCE_UNKNOWN = 0,
  44         KVM_RISCV_HFENCE_GVMA_VMID_GPA,
  45         KVM_RISCV_HFENCE_VVMA_ASID_GVA,
  46         KVM_RISCV_HFENCE_VVMA_ASID_ALL,
  47         KVM_RISCV_HFENCE_VVMA_GVA,
  48 };
  49
  50 struct kvm_riscv_hfence {
  51         enum kvm_riscv_hfence_type type;
  52         unsigned long asid;
  53         unsigned long order;
  54         gpa_t addr;
  55         gpa_t size;
  56 };
  57
  58 #define KVM_RISCV_VCPU_MAX_HFENCE       64
  59
  60 struct kvm_vm_stat {
  61         struct kvm_vm_stat_generic generic;
  62 };
  63
  64 struct kvm_vcpu_stat {
  65         struct kvm_vcpu_stat_generic generic;
  66         u64 ecall_exit_stat;
  67         u64 wfi_exit_stat;
  68         u64 mmio_exit_user;
  69         u64 mmio_exit_kernel;
  70         u64 csr_exit_user;
  71         u64 csr_exit_kernel;
  72         u64 signal_exits;
  73         u64 exits;
  74 };
  75
  76 struct kvm_arch_memory_slot {
  77 };
  78
  79 struct kvm_vmid {
  80         /*
  81          * Writes to vmid_version and vmid happen with vmid_lock held
  82          * whereas reads happen without any lock held.
  83          */
  84         unsigned long vmid_version;
  85         unsigned long vmid;
  86 };
  87
  88 struct kvm_arch {
  89         /* G-stage vmid */
  90         struct kvm_vmid vmid;
  91
  92         /* G-stage page table */
  93         pgd_t *pgd;
  94         phys_addr_t pgd_phys;
  95
  96         /* Guest Timer */
  97         struct kvm_guest_timer timer;
  98
  99         /* AIA Guest/VM context */
 100         struct kvm_aia aia;
 101 };
 102
 103 struct kvm_cpu_trap {
 104         unsigned long sepc;
 105         unsigned long scause;
 106         unsigned long stval;
 107         unsigned long htval;
 108         unsigned long htinst;
 109 };
 110
 111 struct kvm_cpu_context {
 112         unsigned long zero;
 113         unsigned long ra;
 114         unsigned long sp;
 115         unsigned long gp;
 116         unsigned long tp;
 117         unsigned long t0;
 118         unsigned long t1;
 119         unsigned long t2;
 120         unsigned long s0;
 121         unsigned long s1;
 122         unsigned long a0;
 123         unsigned long a1;
 124         unsigned long a2;
 125         unsigned long a3;
 126         unsigned long a4;
 127         unsigned long a5;
 128         unsigned long a6;
 129         unsigned long a7;
 130         unsigned long s2;
 131         unsigned long s3;
 132         unsigned long s4;
 133         unsigned long s5;
 134         unsigned long s6;
 135         unsigned long s7;
 136         unsigned long s8;
 137         unsigned long s9;
 138         unsigned long s10;
 139         unsigned long s11;
 140         unsigned long t3;
 141         unsigned long t4;
 142         unsigned long t5;
 143         unsigned long t6;
 144         unsigned long sepc;
 145         unsigned long sstatus;
 146         unsigned long hstatus;
 147         union __riscv_fp_state fp;
 148 };
 149
 150 struct kvm_vcpu_csr {
 151         unsigned long vsstatus;
 152         unsigned long vsie;
 153         unsigned long vstvec;
 154         unsigned long vsscratch;
 155         unsigned long vsepc;
 156         unsigned long vscause;
 157         unsigned long vstval;
 158         unsigned long hvip;
 159         unsigned long vsatp;
 160         unsigned long scounteren;
 161 };
 162
 163 struct kvm_vcpu_arch {
 164         /* VCPU ran at least once */
 165         bool ran_atleast_once;
 166
 167         /* Last Host CPU on which Guest VCPU exited */
 168         int last_exit_cpu;
 169
 170         /* ISA feature bits (similar to MISA) */
 171         DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
 172
 173         /* Vendor, Arch, and Implementation details */
 174         unsigned long mvendorid;
 175         unsigned long marchid;
 176         unsigned long mimpid;
 177
 178         /* SSCRATCH, STVEC, and SCOUNTEREN of Host */
 179         unsigned long host_sscratch;
 180         unsigned long host_stvec;
 181         unsigned long host_scounteren;
 182
 183         /* CPU context of Host */
 184         struct kvm_cpu_context host_context;
 185
 186         /* CPU context of Guest VCPU */
 187         struct kvm_cpu_context guest_context;
 188
 189         /* CPU CSR context of Guest VCPU */
 190         struct kvm_vcpu_csr guest_csr;
 191
 192         /* CPU context upon Guest VCPU reset */
 193         struct kvm_cpu_context guest_reset_context;
 194
 195         /* CPU CSR context upon Guest VCPU reset */
 196         struct kvm_vcpu_csr guest_reset_csr;
 197
 198         /*
 199          * VCPU interrupts
 200          *
 201          * We have a lockless approach for tracking pending VCPU interrupts
 202          * implemented using atomic bitops. The irqs_pending bitmap represent
 203          * pending interrupts whereas irqs_pending_mask represent bits changed
 204          * in irqs_pending. Our approach is modeled around multiple producer
 205          * and single consumer problem where the consumer is the VCPU itself.
 206          */
 207 #define KVM_RISCV_VCPU_NR_IRQS  64
 208         DECLARE_BITMAP(irqs_pending, KVM_RISCV_VCPU_NR_IRQS);
 209         DECLARE_BITMAP(irqs_pending_mask, KVM_RISCV_VCPU_NR_IRQS);
 210
 211         /* VCPU Timer */
 212         struct kvm_vcpu_timer timer;
 213
 214         /* HFENCE request queue */
 215         spinlock_t hfence_lock;
 216         unsigned long hfence_head;
 217         unsigned long hfence_tail;
 218         struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE];
 219
 220         /* MMIO instruction details */
 221         struct kvm_mmio_decode mmio_decode;
 222
 223         /* CSR instruction details */
 224         struct kvm_csr_decode csr_decode;
 225
 226         /* SBI context */
 227         struct kvm_vcpu_sbi_context sbi_context;
 228
 229         /* AIA VCPU context */
 230         struct kvm_vcpu_aia aia_context;
 231
 232         /* Cache pages needed to program page tables with spinlock held */
 233         struct kvm_mmu_memory_cache mmu_page_cache;
 234
 235         /* VCPU power-off state */
 236         bool power_off;
 237
 238         /* Don't run the VCPU (blocked) */
 239         bool pause;
 240
 241         /* Performance monitoring context */
 242         struct kvm_pmu pmu_context;
 243 };
 244
 245 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 246 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 247
 248 #define KVM_ARCH_WANT_MMU_NOTIFIER
 249
 250 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER          12
 251
 252 void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
 253                                           gpa_t gpa, gpa_t gpsz,
 254                                           unsigned long order);
 255 void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid);
 256 void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz,
 257                                      unsigned long order);
 258 void kvm_riscv_local_hfence_gvma_all(void);
 259 void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid,
 260                                           unsigned long asid,
 261                                           unsigned long gva,
 262                                           unsigned long gvsz,
 263                                           unsigned long order);
 264 void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid,
 265                                           unsigned long asid);
 266 void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid,
 267                                      unsigned long gva, unsigned long gvsz,
 268                                      unsigned long order);
 269 void kvm_riscv_local_hfence_vvma_all(unsigned long vmid);
 270
 271 void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu);
 272
 273 void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu);
 274 void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu);
 275 void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu);
 276 void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu);
 277
 278 void kvm_riscv_fence_i(struct kvm *kvm,
 279                        unsigned long hbase, unsigned long hmask);
 280 void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm,
 281                                     unsigned long hbase, unsigned long hmask,
 282                                     gpa_t gpa, gpa_t gpsz,
 283                                     unsigned long order);
 284 void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm,
 285                                     unsigned long hbase, unsigned long hmask);
 286 void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm,
 287                                     unsigned long hbase, unsigned long hmask,
 288                                     unsigned long gva, unsigned long gvsz,
 289                                     unsigned long order, unsigned long asid);
 290 void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm,
 291                                     unsigned long hbase, unsigned long hmask,
 292                                     unsigned long asid);
 293 void kvm_riscv_hfence_vvma_gva(struct kvm *kvm,
 294                                unsigned long hbase, unsigned long hmask,
 295                                unsigned long gva, unsigned long gvsz,
 296                                unsigned long order);
 297 void kvm_riscv_hfence_vvma_all(struct kvm *kvm,
 298                                unsigned long hbase, unsigned long hmask);
 299
 300 int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,
 301                              phys_addr_t hpa, unsigned long size,
 302                              bool writable, bool in_atomic);
 303 void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa,
 304                               unsigned long size);
 305 int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
 306                          struct kvm_memory_slot *memslot,
 307                          gpa_t gpa, unsigned long hva, bool is_write);
 308 int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm);
 309 void kvm_riscv_gstage_free_pgd(struct kvm *kvm);
 310 void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu);
 311 void __init kvm_riscv_gstage_mode_detect(void);
 312 unsigned long __init kvm_riscv_gstage_mode(void);
 313 int kvm_riscv_gstage_gpa_bits(void);
 314
 315 void __init kvm_riscv_gstage_vmid_detect(void);
 316 unsigned long kvm_riscv_gstage_vmid_bits(void);
 317 int kvm_riscv_gstage_vmid_init(struct kvm *kvm);
 318 bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid);
 319 void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu);
 320
 321 void __kvm_riscv_unpriv_trap(void);
 322
 323 unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
 324                                          bool read_insn,
 325                                          unsigned long guest_addr,
 326                                          struct kvm_cpu_trap *trap);
 327 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
 328                                   struct kvm_cpu_trap *trap);
 329 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 330                         struct kvm_cpu_trap *trap);
 331
 332 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch);
 333
 334 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
 335 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
 336 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu);
 337 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu);
 338 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
 339 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
 340 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
 341
 342 #endif /* __RISCV_KVM_HOST_H__ */