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#if defined(CONFIG_KVM_ARM_MAX_VCPUS)
33#define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
34#else
35#define KVM_MAX_VCPUS 0
36#endif
37
38#define KVM_USER_MEM_SLOTS 32
39#define KVM_PRIVATE_MEM_SLOTS 4
40#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
41#define KVM_HAVE_ONE_REG
42
43#define KVM_VCPU_MAX_FEATURES 2
44
45#include <kvm/arm_vgic.h>
46
47u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
48int __attribute_const__ kvm_target_cpu(void);
49int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
50void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
51
52struct kvm_arch {
53	/* VTTBR value associated with below pgd and vmid */
54	u64    vttbr;
55
56	/* Timer */
57	struct arch_timer_kvm	timer;
58
59	/*
60	 * Anything that is not used directly from assembly code goes
61	 * here.
62	 */
63
64	/* The VMID generation used for the virt. memory system */
65	u64    vmid_gen;
66	u32    vmid;
67
68	/* Stage-2 page table */
69	pgd_t *pgd;
70
71	/* Interrupt controller */
72	struct vgic_dist	vgic;
73	int max_vcpus;
74};
75
76#define KVM_NR_MEM_OBJS     40
77
78/*
79 * We don't want allocation failures within the mmu code, so we preallocate
80 * enough memory for a single page fault in a cache.
81 */
82struct kvm_mmu_memory_cache {
83	int nobjs;
84	void *objects[KVM_NR_MEM_OBJS];
85};
86
87struct kvm_vcpu_fault_info {
88	u32 hsr;		/* Hyp Syndrome Register */
89	u32 hxfar;		/* Hyp Data/Inst. Fault Address Register */
90	u32 hpfar;		/* Hyp IPA Fault Address Register */
91	u32 hyp_pc;		/* PC when exception was taken from Hyp mode */
92};
93
94typedef struct vfp_hard_struct kvm_cpu_context_t;
95
96struct kvm_vcpu_arch {
97	struct kvm_regs regs;
98
99	int target; /* Processor target */
100	DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
101
102	/* System control coprocessor (cp15) */
103	u32 cp15[NR_CP15_REGS];
104
105	/* The CPU type we expose to the VM */
106	u32 midr;
107
108	/* HYP trapping configuration */
109	u32 hcr;
110
111	/* Interrupt related fields */
112	u32 irq_lines;		/* IRQ and FIQ levels */
113
114	/* Exception Information */
115	struct kvm_vcpu_fault_info fault;
116
117	/* Floating point registers (VFP and Advanced SIMD/NEON) */
118	struct vfp_hard_struct vfp_guest;
119
120	/* Host FP context */
121	kvm_cpu_context_t *host_cpu_context;
122
123	/* VGIC state */
124	struct vgic_cpu vgic_cpu;
125	struct arch_timer_cpu timer_cpu;
126
127	/*
128	 * Anything that is not used directly from assembly code goes
129	 * here.
130	 */
131
132	/* Don't run the guest on this vcpu */
133	bool pause;
134
135	/* IO related fields */
136	struct kvm_decode mmio_decode;
137
138	/* Cache some mmu pages needed inside spinlock regions */
139	struct kvm_mmu_memory_cache mmu_page_cache;
140
141	/* Detect first run of a vcpu */
142	bool has_run_once;
143};
144
145struct kvm_vm_stat {
146	u32 remote_tlb_flush;
147};
148
149struct kvm_vcpu_stat {
150	u32 halt_successful_poll;
151	u32 halt_wakeup;
152};
153
154int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
155unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
156int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
157int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
158int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
159u64 kvm_call_hyp(void *hypfn, ...);
160void force_vm_exit(const cpumask_t *mask);
161
162#define KVM_ARCH_WANT_MMU_NOTIFIER
163int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
164int kvm_unmap_hva_range(struct kvm *kvm,
165			unsigned long start, unsigned long end);
166void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
167
168unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
169int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
170int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
171int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
172
173/* We do not have shadow page tables, hence the empty hooks */
174static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
175							 unsigned long address)
176{
177}
178
179struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
180struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
181
182int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
183unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
184int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
185int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
186
187int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
188		int exception_index);
189
190static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
191				       phys_addr_t pgd_ptr,
192				       unsigned long hyp_stack_ptr,
193				       unsigned long vector_ptr)
194{
195	/*
196	 * Call initialization code, and switch to the full blown HYP
197	 * code. The init code doesn't need to preserve these
198	 * registers as r0-r3 are already callee saved according to
199	 * the AAPCS.
200	 * Note that we slightly misuse the prototype by casing the
201	 * stack pointer to a void *.
202	 *
203	 * We don't have enough registers to perform the full init in
204	 * one go.  Install the boot PGD first, and then install the
205	 * runtime PGD, stack pointer and vectors. The PGDs are always
206	 * passed as the third argument, in order to be passed into
207	 * r2-r3 to the init code (yes, this is compliant with the
208	 * PCS!).
209	 */
210
211	kvm_call_hyp(NULL, 0, boot_pgd_ptr);
212
213	kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
214}
215
216static inline int kvm_arch_dev_ioctl_check_extension(long ext)
217{
218	return 0;
219}
220
221static inline void vgic_arch_setup(const struct vgic_params *vgic)
222{
223	BUG_ON(vgic->type != VGIC_V2);
224}
225
226int kvm_perf_init(void);
227int kvm_perf_teardown(void);
228
229void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
230
231struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
232
233static inline void kvm_arch_hardware_disable(void) {}
234static inline void kvm_arch_hardware_unsetup(void) {}
235static inline void kvm_arch_sync_events(struct kvm *kvm) {}
236static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
237static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
238
239#endif /* __ARM_KVM_HOST_H__ */
240