arch/arm/include/asm/kvm_host.h

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #ifndef __ARM_KVM_HOST_H__
  20 #define __ARM_KVM_HOST_H__
  21
  22 #include <linux/types.h>
  23 #include <linux/kvm_types.h>
  24 #include <asm/kvm.h>
  25 #include <asm/kvm_asm.h>
  26 #include <asm/kvm_mmio.h>
  27 #include <asm/fpstate.h>
  28 #include <kvm/arm_arch_timer.h>
  29
  30 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  31
  32 #define KVM_USER_MEM_SLOTS 32
  33 #define KVM_PRIVATE_MEM_SLOTS 4
  34 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  35 #define KVM_HAVE_ONE_REG
  36 #define KVM_HALT_POLL_NS_DEFAULT 500000
  37
  38 #define KVM_VCPU_MAX_FEATURES 2
  39
  40 #include <kvm/arm_vgic.h>
  41
  42 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  43
  44 #define KVM_REQ_VCPU_EXIT       8
  45
  46 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  47 int __attribute_const__ kvm_target_cpu(void);
  48 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  49 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  50
  51 struct kvm_arch {
  52         /* VTTBR value associated with below pgd and vmid */
  53         u64    vttbr;
  54
  55         /* Timer */
  56         struct arch_timer_kvm   timer;
  57
  58         /*
  59          * Anything that is not used directly from assembly code goes
  60          * here.
  61          */
  62
  63         /* The VMID generation used for the virt. memory system */
  64         u64    vmid_gen;
  65         u32    vmid;
  66
  67         /* Stage-2 page table */
  68         pgd_t *pgd;
  69
  70         /* Interrupt controller */
  71         struct vgic_dist        vgic;
  72         int max_vcpus;
  73 };
  74
  75 #define KVM_NR_MEM_OBJS     40
  76
  77 /*
  78  * We don't want allocation failures within the mmu code, so we preallocate
  79  * enough memory for a single page fault in a cache.
  80  */
  81 struct kvm_mmu_memory_cache {
  82         int nobjs;
  83         void *objects[KVM_NR_MEM_OBJS];
  84 };
  85
  86 struct kvm_vcpu_fault_info {
  87         u32 hsr;                /* Hyp Syndrome Register */
  88         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  89         u32 hpfar;              /* Hyp IPA Fault Address Register */
  90 };
  91
  92 /*
  93  * 0 is reserved as an invalid value.
  94  * Order should be kept in sync with the save/restore code.
  95  */
  96 enum vcpu_sysreg {
  97         __INVALID_SYSREG__,
  98         c0_MPIDR,               /* MultiProcessor ID Register */
  99         c0_CSSELR,              /* Cache Size Selection Register */
 100         c1_SCTLR,               /* System Control Register */
 101         c1_ACTLR,               /* Auxiliary Control Register */
 102         c1_CPACR,               /* Coprocessor Access Control */
 103         c2_TTBR0,               /* Translation Table Base Register 0 */
 104         c2_TTBR0_high,          /* TTBR0 top 32 bits */
 105         c2_TTBR1,               /* Translation Table Base Register 1 */
 106         c2_TTBR1_high,          /* TTBR1 top 32 bits */
 107         c2_TTBCR,               /* Translation Table Base Control R. */
 108         c3_DACR,                /* Domain Access Control Register */
 109         c5_DFSR,                /* Data Fault Status Register */
 110         c5_IFSR,                /* Instruction Fault Status Register */
 111         c5_ADFSR,               /* Auxilary Data Fault Status R */
 112         c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 113         c6_DFAR,                /* Data Fault Address Register */
 114         c6_IFAR,                /* Instruction Fault Address Register */
 115         c7_PAR,                 /* Physical Address Register */
 116         c7_PAR_high,            /* PAR top 32 bits */
 117         c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 118         c10_PRRR,               /* Primary Region Remap Register */
 119         c10_NMRR,               /* Normal Memory Remap Register */
 120         c12_VBAR,               /* Vector Base Address Register */
 121         c13_CID,                /* Context ID Register */
 122         c13_TID_URW,            /* Thread ID, User R/W */
 123         c13_TID_URO,            /* Thread ID, User R/O */
 124         c13_TID_PRIV,           /* Thread ID, Privileged */
 125         c14_CNTKCTL,            /* Timer Control Register (PL1) */
 126         c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 127         c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 128         NR_CP15_REGS            /* Number of regs (incl. invalid) */
 129 };
 130
 131 struct kvm_cpu_context {
 132         struct kvm_regs gp_regs;
 133         struct vfp_hard_struct vfp;
 134         u32 cp15[NR_CP15_REGS];
 135 };
 136
 137 typedef struct kvm_cpu_context kvm_cpu_context_t;
 138
 139 struct kvm_vcpu_arch {
 140         struct kvm_cpu_context ctxt;
 141
 142         int target; /* Processor target */
 143         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 144
 145         /* The CPU type we expose to the VM */
 146         u32 midr;
 147
 148         /* HYP trapping configuration */
 149         u32 hcr;
 150
 151         /* Interrupt related fields */
 152         u32 irq_lines;          /* IRQ and FIQ levels */
 153
 154         /* Exception Information */
 155         struct kvm_vcpu_fault_info fault;
 156
 157         /* Host FP context */
 158         kvm_cpu_context_t *host_cpu_context;
 159
 160         /* VGIC state */
 161         struct vgic_cpu vgic_cpu;
 162         struct arch_timer_cpu timer_cpu;
 163
 164         /*
 165          * Anything that is not used directly from assembly code goes
 166          * here.
 167          */
 168
 169         /* vcpu power-off state */
 170         bool power_off;
 171
 172          /* Don't run the guest (internal implementation need) */
 173         bool pause;
 174
 175         /* IO related fields */
 176         struct kvm_decode mmio_decode;
 177
 178         /* Cache some mmu pages needed inside spinlock regions */
 179         struct kvm_mmu_memory_cache mmu_page_cache;
 180
 181         /* Detect first run of a vcpu */
 182         bool has_run_once;
 183 };
 184
 185 struct kvm_vm_stat {
 186         u32 remote_tlb_flush;
 187 };
 188
 189 struct kvm_vcpu_stat {
 190         u32 halt_successful_poll;
 191         u32 halt_attempted_poll;
 192         u32 halt_poll_invalid;
 193         u32 halt_wakeup;
 194         u32 hvc_exit_stat;
 195         u64 wfe_exit_stat;
 196         u64 wfi_exit_stat;
 197         u64 mmio_exit_user;
 198         u64 mmio_exit_kernel;
 199         u64 exits;
 200 };
 201
 202 #define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 203
 204 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 205 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 206 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 207 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 208 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 209 unsigned long kvm_call_hyp(void *hypfn, ...);
 210 void force_vm_exit(const cpumask_t *mask);
 211
 212 #define KVM_ARCH_WANT_MMU_NOTIFIER
 213 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 214 int kvm_unmap_hva_range(struct kvm *kvm,
 215                         unsigned long start, unsigned long end);
 216 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 217
 218 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 219 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 220 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 221 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 222
 223 /* We do not have shadow page tables, hence the empty hooks */
 224 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 225                                                          unsigned long address)
 226 {
 227 }
 228
 229 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 230 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 231 void kvm_arm_halt_guest(struct kvm *kvm);
 232 void kvm_arm_resume_guest(struct kvm *kvm);
 233 void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu);
 234 void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu);
 235
 236 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 237 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 238 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 239 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 240
 241 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 242                 int exception_index);
 243
 244 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 245                                        unsigned long hyp_stack_ptr,
 246                                        unsigned long vector_ptr)
 247 {
 248         /*
 249          * Call initialization code, and switch to the full blown HYP
 250          * code. The init code doesn't need to preserve these
 251          * registers as r0-r3 are already callee saved according to
 252          * the AAPCS.
 253          * Note that we slightly misuse the prototype by casting the
 254          * stack pointer to a void *.
 255
 256          * The PGDs are always passed as the third argument, in order
 257          * to be passed into r2-r3 to the init code (yes, this is
 258          * compliant with the PCS!).
 259          */
 260
 261         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 262 }
 263
 264 static inline void __cpu_init_stage2(void)
 265 {
 266         kvm_call_hyp(__init_stage2_translation);
 267 }
 268
 269 static inline void __cpu_reset_hyp_mode(unsigned long vector_ptr,
 270                                         phys_addr_t phys_idmap_start)
 271 {
 272         kvm_call_hyp((void *)virt_to_idmap(__kvm_hyp_reset), vector_ptr);
 273 }
 274
 275 static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
 276 {
 277         return 0;
 278 }
 279
 280 int kvm_perf_init(void);
 281 int kvm_perf_teardown(void);
 282
 283 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 284
 285 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 286
 287 static inline void kvm_arch_hardware_unsetup(void) {}
 288 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 289 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 290 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 291 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 292
 293 static inline void kvm_arm_init_debug(void) {}
 294 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 295 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 296 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 297 static inline int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 298                                              struct kvm_device_attr *attr)
 299 {
 300         return -ENXIO;
 301 }
 302 static inline int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 303                                              struct kvm_device_attr *attr)
 304 {
 305         return -ENXIO;
 306 }
 307 static inline int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 308                                              struct kvm_device_attr *attr)
 309 {
 310         return -ENXIO;
 311 }
 312
 313 #endif /* __ARM_KVM_HOST_H__ */