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 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
32
33 #define KVM_USER_MEM_SLOTS 32
34 #define KVM_PRIVATE_MEM_SLOTS 4
35 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
36 #define KVM_HALT_POLL_NS_DEFAULT 500000
37
38 #include <kvm/arm_vgic.h>
39 #include <kvm/arm_arch_timer.h>
40
41 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
42
43 #define KVM_VCPU_MAX_FEATURES 3
44
45 int __attribute_const__ kvm_target_cpu(void);
46 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
47 int kvm_arch_dev_ioctl_check_extension(long ext);
48
49 struct kvm_arch {
50 /* The VMID generation used for the virt. memory system */
51 u64 vmid_gen;
52 u32 vmid;
53
54 /* 1-level 2nd stage table and lock */
55 spinlock_t pgd_lock;
56 pgd_t *pgd;
57
58 /* VTTBR value associated with above pgd and vmid */
59 u64 vttbr;
60
61 /* The maximum number of vCPUs depends on the used GIC model */
62 int max_vcpus;
63
64 /* Interrupt controller */
65 struct vgic_dist vgic;
66
67 /* Timer */
68 struct arch_timer_kvm timer;
69 };
70
71 #define KVM_NR_MEM_OBJS 40
72
73 /*
74 * We don't want allocation failures within the mmu code, so we preallocate
75 * enough memory for a single page fault in a cache.
76 */
77 struct kvm_mmu_memory_cache {
78 int nobjs;
79 void *objects[KVM_NR_MEM_OBJS];
80 };
81
82 struct kvm_vcpu_fault_info {
83 u32 esr_el2; /* Hyp Syndrom Register */
84 u64 far_el2; /* Hyp Fault Address Register */
85 u64 hpfar_el2; /* Hyp IPA Fault Address Register */
86 };
87
88 struct kvm_cpu_context {
89 struct kvm_regs gp_regs;
90 union {
91 u64 sys_regs[NR_SYS_REGS];
92 u32 copro[NR_COPRO_REGS];
93 };
94 };
95
96 typedef struct kvm_cpu_context kvm_cpu_context_t;
97
98 struct kvm_vcpu_arch {
99 struct kvm_cpu_context ctxt;
100
101 /* HYP configuration */
102 u64 hcr_el2;
103 u32 mdcr_el2;
104
105 /* Exception Information */
106 struct kvm_vcpu_fault_info fault;
107
108 /* Guest debug state */
109 u64 debug_flags;
110
111 /*
112 * We maintain more than a single set of debug registers to support
113 * debugging the guest from the host and to maintain separate host and
114 * guest state during world switches. vcpu_debug_state are the debug
115 * registers of the vcpu as the guest sees them. host_debug_state are
116 * the host registers which are saved and restored during
117 * world switches. external_debug_state contains the debug
118 * values we want to debug the guest. This is set via the
119 * KVM_SET_GUEST_DEBUG ioctl.
120 *
121 * debug_ptr points to the set of debug registers that should be loaded
122 * onto the hardware when running the guest.
123 */
124 struct kvm_guest_debug_arch *debug_ptr;
125 struct kvm_guest_debug_arch vcpu_debug_state;
126 struct kvm_guest_debug_arch external_debug_state;
127
128 /* Pointer to host CPU context */
129 kvm_cpu_context_t *host_cpu_context;
130 struct kvm_guest_debug_arch host_debug_state;
131
132 /* VGIC state */
133 struct vgic_cpu vgic_cpu;
134 struct arch_timer_cpu timer_cpu;
135
136 /*
137 * Anything that is not used directly from assembly code goes
138 * here.
139 */
140
141 /*
142 * Guest registers we preserve during guest debugging.
143 *
144 * These shadow registers are updated by the kvm_handle_sys_reg
145 * trap handler if the guest accesses or updates them while we
146 * are using guest debug.
147 */
148 struct {
149 u32 mdscr_el1;
150 } guest_debug_preserved;
151
152 /* vcpu power-off state */
153 bool power_off;
154
155 /* Don't run the guest (internal implementation need) */
156 bool pause;
157
158 /* IO related fields */
159 struct kvm_decode mmio_decode;
160
161 /* Interrupt related fields */
162 u64 irq_lines; /* IRQ and FIQ levels */
163
164 /* Cache some mmu pages needed inside spinlock regions */
165 struct kvm_mmu_memory_cache mmu_page_cache;
166
167 /* Target CPU and feature flags */
168 int target;
169 DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
170
171 /* Detect first run of a vcpu */
172 bool has_run_once;
173 };
174
175 #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)
176 #define vcpu_sys_reg(v,r) ((v)->arch.ctxt.sys_regs[(r)])
177 /*
178 * CP14 and CP15 live in the same array, as they are backed by the
179 * same system registers.
180 */
181 #define CPx_BIAS IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
182
183 #define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r) ^ CPx_BIAS])
184 #define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r) ^ CPx_BIAS])
185
186 #ifdef CONFIG_CPU_BIG_ENDIAN
187 #define vcpu_cp15_64_high(v,r) vcpu_cp15((v),(r))
188 #define vcpu_cp15_64_low(v,r) vcpu_cp15((v),(r) + 1)
189 #else
190 #define vcpu_cp15_64_high(v,r) vcpu_cp15((v),(r) + 1)
191 #define vcpu_cp15_64_low(v,r) vcpu_cp15((v),(r))
192 #endif
193
194 struct kvm_vm_stat {
195 u32 remote_tlb_flush;
196 };
197
198 struct kvm_vcpu_stat {
199 u32 halt_successful_poll;
200 u32 halt_attempted_poll;
201 u32 halt_wakeup;
202 };
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
210 #define KVM_ARCH_WANT_MMU_NOTIFIER
211 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
212 int kvm_unmap_hva_range(struct kvm *kvm,
213 unsigned long start, unsigned long end);
214 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
215 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
216 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
217
218 /* We do not have shadow page tables, hence the empty hooks */
kvm_arch_mmu_notifier_invalidate_page(struct kvm * kvm,unsigned long address)219 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
220 unsigned long address)
221 {
222 }
223
224 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
225 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
226
227 u64 __kvm_call_hyp(void *hypfn, ...);
228 void force_vm_exit(const cpumask_t *mask);
229 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
230
231 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
232 int exception_index);
233
234 int kvm_perf_init(void);
235 int kvm_perf_teardown(void);
236
237 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
238
__cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,phys_addr_t pgd_ptr,unsigned long hyp_stack_ptr,unsigned long vector_ptr)239 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
240 phys_addr_t pgd_ptr,
241 unsigned long hyp_stack_ptr,
242 unsigned long vector_ptr)
243 {
244 /*
245 * Call initialization code, and switch to the full blown
246 * HYP code.
247 */
248 __kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
249 hyp_stack_ptr, vector_ptr);
250 }
251
kvm_arch_hardware_disable(void)252 static inline void kvm_arch_hardware_disable(void) {}
kvm_arch_hardware_unsetup(void)253 static inline void kvm_arch_hardware_unsetup(void) {}
kvm_arch_sync_events(struct kvm * kvm)254 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
kvm_arch_vcpu_uninit(struct kvm_vcpu * vcpu)255 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)256 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
257
258 void kvm_arm_init_debug(void);
259 void kvm_arm_setup_debug(struct kvm_vcpu *vcpu);
260 void kvm_arm_clear_debug(struct kvm_vcpu *vcpu);
261 void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu);
262
263 #define kvm_call_hyp(f, ...) __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__)
264
265 #endif /* __ARM64_KVM_HOST_H__ */
266