1 /*
2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * Derived from arch/arm/include/asm/kvm_host.h:
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #ifndef __ARM64_KVM_HOST_H__
23 #define __ARM64_KVM_HOST_H__
24
25 #include <linux/types.h>
26 #include <linux/kvm_types.h>
27 #include <asm/kvm.h>
28 #include <asm/kvm_asm.h>
29 #include <asm/kvm_mmio.h>
30
31 #if defined(CONFIG_KVM_ARM_MAX_VCPUS)
32 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
33 #else
34 #define KVM_MAX_VCPUS 0
35 #endif
36
37 #define KVM_USER_MEM_SLOTS 32
38 #define KVM_PRIVATE_MEM_SLOTS 4
39 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
40
41 #include <kvm/arm_vgic.h>
42 #include <kvm/arm_arch_timer.h>
43
44 #define KVM_VCPU_MAX_FEATURES 3
45
46 int __attribute_const__ kvm_target_cpu(void);
47 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
48 int kvm_arch_dev_ioctl_check_extension(long ext);
49
50 struct kvm_arch {
51 /* The VMID generation used for the virt. memory system */
52 u64 vmid_gen;
53 u32 vmid;
54
55 /* 1-level 2nd stage table and lock */
56 spinlock_t pgd_lock;
57 pgd_t *pgd;
58
59 /* VTTBR value associated with above pgd and vmid */
60 u64 vttbr;
61
62 /* Interrupt controller */
63 struct vgic_dist vgic;
64
65 /* Timer */
66 struct arch_timer_kvm timer;
67 };
68
69 #define KVM_NR_MEM_OBJS 40
70
71 /*
72 * We don't want allocation failures within the mmu code, so we preallocate
73 * enough memory for a single page fault in a cache.
74 */
75 struct kvm_mmu_memory_cache {
76 int nobjs;
77 void *objects[KVM_NR_MEM_OBJS];
78 };
79
80 struct kvm_vcpu_fault_info {
81 u32 esr_el2; /* Hyp Syndrom Register */
82 u64 far_el2; /* Hyp Fault Address Register */
83 u64 hpfar_el2; /* Hyp IPA Fault Address Register */
84 };
85
86 struct kvm_cpu_context {
87 struct kvm_regs gp_regs;
88 union {
89 u64 sys_regs[NR_SYS_REGS];
90 u32 copro[NR_COPRO_REGS];
91 };
92 };
93
94 typedef struct kvm_cpu_context kvm_cpu_context_t;
95
96 struct kvm_vcpu_arch {
97 struct kvm_cpu_context ctxt;
98
99 /* HYP configuration */
100 u64 hcr_el2;
101
102 /* Exception Information */
103 struct kvm_vcpu_fault_info fault;
104
105 /* Debug state */
106 u64 debug_flags;
107
108 /* Pointer to host CPU context */
109 kvm_cpu_context_t *host_cpu_context;
110
111 /* VGIC state */
112 struct vgic_cpu vgic_cpu;
113 struct arch_timer_cpu timer_cpu;
114
115 /*
116 * Anything that is not used directly from assembly code goes
117 * here.
118 */
119
120 /* Don't run the guest */
121 bool pause;
122
123 /* IO related fields */
124 struct kvm_decode mmio_decode;
125
126 /* Interrupt related fields */
127 u64 irq_lines; /* IRQ and FIQ levels */
128
129 /* Cache some mmu pages needed inside spinlock regions */
130 struct kvm_mmu_memory_cache mmu_page_cache;
131
132 /* Target CPU and feature flags */
133 int target;
134 DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
135
136 /* Detect first run of a vcpu */
137 bool has_run_once;
138 };
139
140 #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)
141 #define vcpu_sys_reg(v,r) ((v)->arch.ctxt.sys_regs[(r)])
142 /*
143 * CP14 and CP15 live in the same array, as they are backed by the
144 * same system registers.
145 */
146 #define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r)])
147 #define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r)])
148
149 #ifdef CONFIG_CPU_BIG_ENDIAN
150 #define vcpu_cp15_64_high(v,r) vcpu_cp15((v),(r))
151 #define vcpu_cp15_64_low(v,r) vcpu_cp15((v),(r) + 1)
152 #else
153 #define vcpu_cp15_64_high(v,r) vcpu_cp15((v),(r) + 1)
154 #define vcpu_cp15_64_low(v,r) vcpu_cp15((v),(r))
155 #endif
156
157 struct kvm_vm_stat {
158 u32 remote_tlb_flush;
159 };
160
161 struct kvm_vcpu_stat {
162 u32 halt_wakeup;
163 };
164
165 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
166 const struct kvm_vcpu_init *init);
167 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
168 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
169 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
170 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
171 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
172
173 #define KVM_ARCH_WANT_MMU_NOTIFIER
174 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
175 int kvm_unmap_hva_range(struct kvm *kvm,
176 unsigned long start, unsigned long end);
177 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
178
179 /* We do not have shadow page tables, hence the empty hooks */
kvm_age_hva(struct kvm * kvm,unsigned long start,unsigned long end)180 static inline int kvm_age_hva(struct kvm *kvm, unsigned long start,
181 unsigned long end)
182 {
183 return 0;
184 }
185
kvm_test_age_hva(struct kvm * kvm,unsigned long hva)186 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
187 {
188 return 0;
189 }
190
kvm_arch_mmu_notifier_invalidate_page(struct kvm * kvm,unsigned long address)191 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
192 unsigned long address)
193 {
194 }
195
196 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
197 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
198
199 u64 kvm_call_hyp(void *hypfn, ...);
200 void force_vm_exit(const cpumask_t *mask);
201
202 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
203 int exception_index);
204
205 int kvm_perf_init(void);
206 int kvm_perf_teardown(void);
207
__cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,phys_addr_t pgd_ptr,unsigned long hyp_stack_ptr,unsigned long vector_ptr)208 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
209 phys_addr_t pgd_ptr,
210 unsigned long hyp_stack_ptr,
211 unsigned long vector_ptr)
212 {
213 /*
214 * Call initialization code, and switch to the full blown
215 * HYP code.
216 */
217 kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
218 hyp_stack_ptr, vector_ptr);
219 }
220
221 struct vgic_sr_vectors {
222 void *save_vgic;
223 void *restore_vgic;
224 };
225
vgic_arch_setup(const struct vgic_params * vgic)226 static inline void vgic_arch_setup(const struct vgic_params *vgic)
227 {
228 extern struct vgic_sr_vectors __vgic_sr_vectors;
229
230 switch(vgic->type)
231 {
232 case VGIC_V2:
233 __vgic_sr_vectors.save_vgic = __save_vgic_v2_state;
234 __vgic_sr_vectors.restore_vgic = __restore_vgic_v2_state;
235 break;
236
237 #ifdef CONFIG_ARM_GIC_V3
238 case VGIC_V3:
239 __vgic_sr_vectors.save_vgic = __save_vgic_v3_state;
240 __vgic_sr_vectors.restore_vgic = __restore_vgic_v3_state;
241 break;
242 #endif
243
244 default:
245 BUG();
246 }
247 }
248
kvm_arch_hardware_disable(void)249 static inline void kvm_arch_hardware_disable(void) {}
kvm_arch_hardware_unsetup(void)250 static inline void kvm_arch_hardware_unsetup(void) {}
kvm_arch_sync_events(struct kvm * kvm)251 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
kvm_arch_vcpu_uninit(struct kvm_vcpu * vcpu)252 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)253 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
254
255 #endif /* __ARM64_KVM_HOST_H__ */
256