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#if defined(CONFIG_KVM_ARM_MAX_VCPUS)
34#define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
35#else
36#define KVM_MAX_VCPUS 0
37#endif
38
39#define KVM_USER_MEM_SLOTS 32
40#define KVM_PRIVATE_MEM_SLOTS 4
41#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
42
43#include <kvm/arm_vgic.h>
44#include <kvm/arm_arch_timer.h>
45
46#define KVM_VCPU_MAX_FEATURES 3
47
48int __attribute_const__ kvm_target_cpu(void);
49int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
50int kvm_arch_dev_ioctl_check_extension(long ext);
51
52struct kvm_arch {
53	/* The VMID generation used for the virt. memory system */
54	u64    vmid_gen;
55	u32    vmid;
56
57	/* 1-level 2nd stage table and lock */
58	spinlock_t pgd_lock;
59	pgd_t *pgd;
60
61	/* VTTBR value associated with above pgd and vmid */
62	u64    vttbr;
63
64	/* The maximum number of vCPUs depends on the used GIC model */
65	int max_vcpus;
66
67	/* Interrupt controller */
68	struct vgic_dist	vgic;
69
70	/* Timer */
71	struct arch_timer_kvm	timer;
72};
73
74#define KVM_NR_MEM_OBJS     40
75
76/*
77 * We don't want allocation failures within the mmu code, so we preallocate
78 * enough memory for a single page fault in a cache.
79 */
80struct kvm_mmu_memory_cache {
81	int nobjs;
82	void *objects[KVM_NR_MEM_OBJS];
83};
84
85struct kvm_vcpu_fault_info {
86	u32 esr_el2;		/* Hyp Syndrom Register */
87	u64 far_el2;		/* Hyp Fault Address Register */
88	u64 hpfar_el2;		/* Hyp IPA Fault Address Register */
89};
90
91struct kvm_cpu_context {
92	struct kvm_regs	gp_regs;
93	union {
94		u64 sys_regs[NR_SYS_REGS];
95		u32 copro[NR_COPRO_REGS];
96	};
97};
98
99typedef struct kvm_cpu_context kvm_cpu_context_t;
100
101struct kvm_vcpu_arch {
102	struct kvm_cpu_context ctxt;
103
104	/* HYP configuration */
105	u64 hcr_el2;
106
107	/* Exception Information */
108	struct kvm_vcpu_fault_info fault;
109
110	/* Debug state */
111	u64 debug_flags;
112
113	/* Pointer to host CPU context */
114	kvm_cpu_context_t *host_cpu_context;
115
116	/* VGIC state */
117	struct vgic_cpu vgic_cpu;
118	struct arch_timer_cpu timer_cpu;
119
120	/*
121	 * Anything that is not used directly from assembly code goes
122	 * here.
123	 */
124
125	/* Don't run the guest */
126	bool pause;
127
128	/* IO related fields */
129	struct kvm_decode mmio_decode;
130
131	/* Interrupt related fields */
132	u64 irq_lines;		/* IRQ and FIQ levels */
133
134	/* Cache some mmu pages needed inside spinlock regions */
135	struct kvm_mmu_memory_cache mmu_page_cache;
136
137	/* Target CPU and feature flags */
138	int target;
139	DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
140
141	/* Detect first run of a vcpu */
142	bool has_run_once;
143};
144
145#define vcpu_gp_regs(v)		(&(v)->arch.ctxt.gp_regs)
146#define vcpu_sys_reg(v,r)	((v)->arch.ctxt.sys_regs[(r)])
147/*
148 * CP14 and CP15 live in the same array, as they are backed by the
149 * same system registers.
150 */
151#define vcpu_cp14(v,r)		((v)->arch.ctxt.copro[(r)])
152#define vcpu_cp15(v,r)		((v)->arch.ctxt.copro[(r)])
153
154#ifdef CONFIG_CPU_BIG_ENDIAN
155#define vcpu_cp15_64_high(v,r)	vcpu_cp15((v),(r))
156#define vcpu_cp15_64_low(v,r)	vcpu_cp15((v),(r) + 1)
157#else
158#define vcpu_cp15_64_high(v,r)	vcpu_cp15((v),(r) + 1)
159#define vcpu_cp15_64_low(v,r)	vcpu_cp15((v),(r))
160#endif
161
162struct kvm_vm_stat {
163	u32 remote_tlb_flush;
164};
165
166struct kvm_vcpu_stat {
167	u32 halt_successful_poll;
168	u32 halt_wakeup;
169};
170
171int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
172unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
173int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
174int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
175int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
176
177#define KVM_ARCH_WANT_MMU_NOTIFIER
178int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
179int kvm_unmap_hva_range(struct kvm *kvm,
180			unsigned long start, unsigned long end);
181void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
182int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
183int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
184
185/* We do not have shadow page tables, hence the empty hooks */
186static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
187							 unsigned long address)
188{
189}
190
191struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
192struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
193
194u64 kvm_call_hyp(void *hypfn, ...);
195void force_vm_exit(const cpumask_t *mask);
196void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
197
198int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
199		int exception_index);
200
201int kvm_perf_init(void);
202int kvm_perf_teardown(void);
203
204struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
205
206static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
207				       phys_addr_t pgd_ptr,
208				       unsigned long hyp_stack_ptr,
209				       unsigned long vector_ptr)
210{
211	/*
212	 * Call initialization code, and switch to the full blown
213	 * HYP code.
214	 */
215	kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
216		     hyp_stack_ptr, vector_ptr);
217}
218
219struct vgic_sr_vectors {
220	void	*save_vgic;
221	void	*restore_vgic;
222};
223
224static inline void vgic_arch_setup(const struct vgic_params *vgic)
225{
226	extern struct vgic_sr_vectors __vgic_sr_vectors;
227
228	switch(vgic->type)
229	{
230	case VGIC_V2:
231		__vgic_sr_vectors.save_vgic	= __save_vgic_v2_state;
232		__vgic_sr_vectors.restore_vgic	= __restore_vgic_v2_state;
233		break;
234
235#ifdef CONFIG_ARM_GIC_V3
236	case VGIC_V3:
237		__vgic_sr_vectors.save_vgic	= __save_vgic_v3_state;
238		__vgic_sr_vectors.restore_vgic	= __restore_vgic_v3_state;
239		break;
240#endif
241
242	default:
243		BUG();
244	}
245}
246
247static inline void kvm_arch_hardware_disable(void) {}
248static inline void kvm_arch_hardware_unsetup(void) {}
249static inline void kvm_arch_sync_events(struct kvm *kvm) {}
250static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
251static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
252
253#endif /* __ARM64_KVM_HOST_H__ */
254