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/cputype.h>
25 #include <asm/kvm.h>
26 #include <asm/kvm_asm.h>
27 #include <asm/kvm_mmio.h>
28 #include <asm/fpstate.h>
29 #include <kvm/arm_arch_timer.h>
30
31 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
32
33 #define KVM_USER_MEM_SLOTS 32
34 #define KVM_HAVE_ONE_REG
35 #define KVM_HALT_POLL_NS_DEFAULT 500000
36
37 #define KVM_VCPU_MAX_FEATURES 2
38
39 #include <kvm/arm_vgic.h>
40
41
42 #ifdef CONFIG_ARM_GIC_V3
43 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
44 #else
45 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
46 #endif
47
48 #define KVM_REQ_SLEEP \
49 KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
50 #define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1)
51
52 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
53
54 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
55 int __attribute_const__ kvm_target_cpu(void);
56 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
57 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
58
59 struct kvm_arch {
60 /* VTTBR value associated with below pgd and vmid */
61 u64 vttbr;
62
63 /* The last vcpu id that ran on each physical CPU */
64 int __percpu *last_vcpu_ran;
65
66 /*
67 * Anything that is not used directly from assembly code goes
68 * here.
69 */
70
71 /* The VMID generation used for the virt. memory system */
72 u64 vmid_gen;
73 u32 vmid;
74
75 /* Stage-2 page table */
76 pgd_t *pgd;
77
78 /* Interrupt controller */
79 struct vgic_dist vgic;
80 int max_vcpus;
81
82 /* Mandated version of PSCI */
83 u32 psci_version;
84 };
85
86 #define KVM_NR_MEM_OBJS 40
87
88 /*
89 * We don't want allocation failures within the mmu code, so we preallocate
90 * enough memory for a single page fault in a cache.
91 */
92 struct kvm_mmu_memory_cache {
93 int nobjs;
94 void *objects[KVM_NR_MEM_OBJS];
95 };
96
97 struct kvm_vcpu_fault_info {
98 u32 hsr; /* Hyp Syndrome Register */
99 u32 hxfar; /* Hyp Data/Inst. Fault Address Register */
100 u32 hpfar; /* Hyp IPA Fault Address Register */
101 };
102
103 /*
104 * 0 is reserved as an invalid value.
105 * Order should be kept in sync with the save/restore code.
106 */
107 enum vcpu_sysreg {
108 __INVALID_SYSREG__,
109 c0_MPIDR, /* MultiProcessor ID Register */
110 c0_CSSELR, /* Cache Size Selection Register */
111 c1_SCTLR, /* System Control Register */
112 c1_ACTLR, /* Auxiliary Control Register */
113 c1_CPACR, /* Coprocessor Access Control */
114 c2_TTBR0, /* Translation Table Base Register 0 */
115 c2_TTBR0_high, /* TTBR0 top 32 bits */
116 c2_TTBR1, /* Translation Table Base Register 1 */
117 c2_TTBR1_high, /* TTBR1 top 32 bits */
118 c2_TTBCR, /* Translation Table Base Control R. */
119 c3_DACR, /* Domain Access Control Register */
120 c5_DFSR, /* Data Fault Status Register */
121 c5_IFSR, /* Instruction Fault Status Register */
122 c5_ADFSR, /* Auxilary Data Fault Status R */
123 c5_AIFSR, /* Auxilary Instrunction Fault Status R */
124 c6_DFAR, /* Data Fault Address Register */
125 c6_IFAR, /* Instruction Fault Address Register */
126 c7_PAR, /* Physical Address Register */
127 c7_PAR_high, /* PAR top 32 bits */
128 c9_L2CTLR, /* Cortex A15/A7 L2 Control Register */
129 c10_PRRR, /* Primary Region Remap Register */
130 c10_NMRR, /* Normal Memory Remap Register */
131 c12_VBAR, /* Vector Base Address Register */
132 c13_CID, /* Context ID Register */
133 c13_TID_URW, /* Thread ID, User R/W */
134 c13_TID_URO, /* Thread ID, User R/O */
135 c13_TID_PRIV, /* Thread ID, Privileged */
136 c14_CNTKCTL, /* Timer Control Register (PL1) */
137 c10_AMAIR0, /* Auxilary Memory Attribute Indirection Reg0 */
138 c10_AMAIR1, /* Auxilary Memory Attribute Indirection Reg1 */
139 NR_CP15_REGS /* Number of regs (incl. invalid) */
140 };
141
142 struct kvm_cpu_context {
143 struct kvm_regs gp_regs;
144 struct vfp_hard_struct vfp;
145 u32 cp15[NR_CP15_REGS];
146 };
147
148 typedef struct kvm_cpu_context kvm_cpu_context_t;
149
150 struct kvm_vcpu_arch {
151 struct kvm_cpu_context ctxt;
152
153 int target; /* Processor target */
154 DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
155
156 /* The CPU type we expose to the VM */
157 u32 midr;
158
159 /* HYP trapping configuration */
160 u32 hcr;
161
162 /* Exception Information */
163 struct kvm_vcpu_fault_info fault;
164
165 /* Host FP context */
166 kvm_cpu_context_t *host_cpu_context;
167
168 /* VGIC state */
169 struct vgic_cpu vgic_cpu;
170 struct arch_timer_cpu timer_cpu;
171
172 /*
173 * Anything that is not used directly from assembly code goes
174 * here.
175 */
176
177 /* vcpu power-off state */
178 bool power_off;
179
180 /* Don't run the guest (internal implementation need) */
181 bool pause;
182
183 /* IO related fields */
184 struct kvm_decode mmio_decode;
185
186 /* Cache some mmu pages needed inside spinlock regions */
187 struct kvm_mmu_memory_cache mmu_page_cache;
188
189 /* Detect first run of a vcpu */
190 bool has_run_once;
191 };
192
193 struct kvm_vm_stat {
194 ulong remote_tlb_flush;
195 };
196
197 struct kvm_vcpu_stat {
198 u64 halt_successful_poll;
199 u64 halt_attempted_poll;
200 u64 halt_poll_invalid;
201 u64 halt_wakeup;
202 u64 hvc_exit_stat;
203 u64 wfe_exit_stat;
204 u64 wfi_exit_stat;
205 u64 mmio_exit_user;
206 u64 mmio_exit_kernel;
207 u64 exits;
208 };
209
210 #define vcpu_cp15(v,r) (v)->arch.ctxt.cp15[r]
211
212 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
213 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
214 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
215 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
216 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
217 unsigned long kvm_call_hyp(void *hypfn, ...);
218 void force_vm_exit(const cpumask_t *mask);
219 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
220 struct kvm_vcpu_events *events);
221
222 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
223 struct kvm_vcpu_events *events);
224
225 #define KVM_ARCH_WANT_MMU_NOTIFIER
226 int kvm_unmap_hva_range(struct kvm *kvm,
227 unsigned long start, unsigned long end);
228 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
229
230 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
231 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
232 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
233 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
234
235 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
236 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
237 void kvm_arm_halt_guest(struct kvm *kvm);
238 void kvm_arm_resume_guest(struct kvm *kvm);
239
240 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
241 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
242 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
243 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
244
245 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
246 int exception_index);
247
handle_exit_early(struct kvm_vcpu * vcpu,struct kvm_run * run,int exception_index)248 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
249 int exception_index) {}
250
__cpu_init_hyp_mode(phys_addr_t pgd_ptr,unsigned long hyp_stack_ptr,unsigned long vector_ptr)251 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
252 unsigned long hyp_stack_ptr,
253 unsigned long vector_ptr)
254 {
255 /*
256 * Call initialization code, and switch to the full blown HYP
257 * code. The init code doesn't need to preserve these
258 * registers as r0-r3 are already callee saved according to
259 * the AAPCS.
260 * Note that we slightly misuse the prototype by casting the
261 * stack pointer to a void *.
262
263 * The PGDs are always passed as the third argument, in order
264 * to be passed into r2-r3 to the init code (yes, this is
265 * compliant with the PCS!).
266 */
267
268 kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
269 }
270
__cpu_init_stage2(void)271 static inline void __cpu_init_stage2(void)
272 {
273 kvm_call_hyp(__init_stage2_translation);
274 }
275
kvm_arch_dev_ioctl_check_extension(struct kvm * kvm,long ext)276 static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
277 {
278 return 0;
279 }
280
281 int kvm_perf_init(void);
282 int kvm_perf_teardown(void);
283
284 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
285
286 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
287
kvm_arch_check_sve_has_vhe(void)288 static inline bool kvm_arch_check_sve_has_vhe(void) { return true; }
kvm_arch_hardware_unsetup(void)289 static inline void kvm_arch_hardware_unsetup(void) {}
kvm_arch_sync_events(struct kvm * kvm)290 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
kvm_arch_vcpu_uninit(struct kvm_vcpu * vcpu)291 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)292 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
kvm_arch_vcpu_block_finish(struct kvm_vcpu * vcpu)293 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
294
kvm_arm_init_debug(void)295 static inline void kvm_arm_init_debug(void) {}
kvm_arm_setup_debug(struct kvm_vcpu * vcpu)296 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
kvm_arm_clear_debug(struct kvm_vcpu * vcpu)297 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
kvm_arm_reset_debug_ptr(struct kvm_vcpu * vcpu)298 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
kvm_arm_handle_step_debug(struct kvm_vcpu * vcpu,struct kvm_run * run)299 static inline bool kvm_arm_handle_step_debug(struct kvm_vcpu *vcpu,
300 struct kvm_run *run)
301 {
302 return false;
303 }
304
305 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
306 struct kvm_device_attr *attr);
307 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
308 struct kvm_device_attr *attr);
309 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
310 struct kvm_device_attr *attr);
311
312 /*
313 * VFP/NEON switching is all done by the hyp switch code, so no need to
314 * coordinate with host context handling for this state:
315 */
kvm_arch_vcpu_load_fp(struct kvm_vcpu * vcpu)316 static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu * vcpu)317 static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
kvm_arch_vcpu_put_fp(struct kvm_vcpu * vcpu)318 static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}
319
kvm_arm_vhe_guest_enter(void)320 static inline void kvm_arm_vhe_guest_enter(void) {}
kvm_arm_vhe_guest_exit(void)321 static inline void kvm_arm_vhe_guest_exit(void) {}
322
kvm_arm_harden_branch_predictor(void)323 static inline bool kvm_arm_harden_branch_predictor(void)
324 {
325 switch(read_cpuid_part()) {
326 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
327 case ARM_CPU_PART_BRAHMA_B15:
328 case ARM_CPU_PART_CORTEX_A12:
329 case ARM_CPU_PART_CORTEX_A15:
330 case ARM_CPU_PART_CORTEX_A17:
331 return true;
332 #endif
333 default:
334 return false;
335 }
336 }
337
338 #define KVM_SSBD_UNKNOWN -1
339 #define KVM_SSBD_FORCE_DISABLE 0
340 #define KVM_SSBD_KERNEL 1
341 #define KVM_SSBD_FORCE_ENABLE 2
342 #define KVM_SSBD_MITIGATED 3
343
kvm_arm_have_ssbd(void)344 static inline int kvm_arm_have_ssbd(void)
345 {
346 /* No way to detect it yet, pretend it is not there. */
347 return KVM_SSBD_UNKNOWN;
348 }
349
kvm_vcpu_load_sysregs(struct kvm_vcpu * vcpu)350 static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
kvm_vcpu_put_sysregs(struct kvm_vcpu * vcpu)351 static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
352
353 #define __KVM_HAVE_ARCH_VM_ALLOC
354 struct kvm *kvm_arch_alloc_vm(void);
355 void kvm_arch_free_vm(struct kvm *kvm);
356
357 #endif /* __ARM_KVM_HOST_H__ */
358
