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 <asm/kvm.h>
 23#include <asm/kvm_asm.h>
 24#include <asm/kvm_mmio.h>
 25#include <asm/fpstate.h>
 26#include <kvm/arm_arch_timer.h>
 27
 28#if defined(CONFIG_KVM_ARM_MAX_VCPUS)
 29#define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
 30#else
 31#define KVM_MAX_VCPUS 0
 32#endif
 33
 34#define KVM_USER_MEM_SLOTS 32
 35#define KVM_PRIVATE_MEM_SLOTS 4
 36#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
 37#define KVM_HAVE_ONE_REG
 38
 39#define KVM_VCPU_MAX_FEATURES 1
 40
 41#include <kvm/arm_vgic.h>
 42
 43struct kvm_vcpu;
 44u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
 45int kvm_target_cpu(void);
 46int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
 47void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
 48
 49struct kvm_arch {
 50	/* VTTBR value associated with below pgd and vmid */
 51	u64    vttbr;
 52
 53	/* Timer */
 54	struct arch_timer_kvm	timer;
 55
 56	/*
 57	 * Anything that is not used directly from assembly code goes
 58	 * here.
 59	 */
 60
 61	/* The VMID generation used for the virt. memory system */
 62	u64    vmid_gen;
 63	u32    vmid;
 64
 65	/* Stage-2 page table */
 66	pgd_t *pgd;
 67
 68	/* Interrupt controller */
 69	struct vgic_dist	vgic;
 70};
 71
 72#define KVM_NR_MEM_OBJS     40
 73
 74/*
 75 * We don't want allocation failures within the mmu code, so we preallocate
 76 * enough memory for a single page fault in a cache.
 77 */
 78struct kvm_mmu_memory_cache {
 79	int nobjs;
 80	void *objects[KVM_NR_MEM_OBJS];
 81};
 82
 83struct kvm_vcpu_fault_info {
 84	u32 hsr;		/* Hyp Syndrome Register */
 85	u32 hxfar;		/* Hyp Data/Inst. Fault Address Register */
 86	u32 hpfar;		/* Hyp IPA Fault Address Register */
 87	u32 hyp_pc;		/* PC when exception was taken from Hyp mode */
 88};
 89
 90typedef struct vfp_hard_struct kvm_cpu_context_t;
 91
 92struct kvm_vcpu_arch {
 93	struct kvm_regs regs;
 94
 95	int target; /* Processor target */
 96	DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 97
 98	/* System control coprocessor (cp15) */
 99	u32 cp15[NR_CP15_REGS];
100
101	/* The CPU type we expose to the VM */
102	u32 midr;
103
104	/* HYP trapping configuration */
105	u32 hcr;
106
107	/* Interrupt related fields */
108	u32 irq_lines;		/* IRQ and FIQ levels */
109
110	/* Exception Information */
111	struct kvm_vcpu_fault_info fault;
112
113	/* Floating point registers (VFP and Advanced SIMD/NEON) */
114	struct vfp_hard_struct vfp_guest;
115
116	/* Host FP context */
117	kvm_cpu_context_t *host_cpu_context;
118
119	/* VGIC state */
120	struct vgic_cpu vgic_cpu;
121	struct arch_timer_cpu timer_cpu;
122
123	/*
124	 * Anything that is not used directly from assembly code goes
125	 * here.
126	 */
127	/* dcache set/way operation pending */
128	int last_pcpu;
129	cpumask_t require_dcache_flush;
130
131	/* Don't run the guest on this vcpu */
132	bool pause;
133
134	/* IO related fields */
135	struct kvm_decode mmio_decode;
136
137	/* Cache some mmu pages needed inside spinlock regions */
138	struct kvm_mmu_memory_cache mmu_page_cache;
139
140	/* Detect first run of a vcpu */
141	bool has_run_once;
142};
143
144struct kvm_vm_stat {
145	u32 remote_tlb_flush;
146};
147
148struct kvm_vcpu_stat {
149	u32 halt_wakeup;
150};
151
152struct kvm_vcpu_init;
153int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
154			const struct kvm_vcpu_init *init);
155int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
156unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
157int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
158struct kvm_one_reg;
159int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
160int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
161u64 kvm_call_hyp(void *hypfn, ...);
162void force_vm_exit(const cpumask_t *mask);
163
164#define KVM_ARCH_WANT_MMU_NOTIFIER
165struct kvm;
166int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
167int kvm_unmap_hva_range(struct kvm *kvm,
168			unsigned long start, unsigned long end);
169void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
170
171unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
172int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
173
174/* We do not have shadow page tables, hence the empty hooks */
175static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
176{
177	return 0;
178}
179
180static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
181{
182	return 0;
183}
184
185struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
186struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
187
188int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
189unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
190struct kvm_one_reg;
191int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
192int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
193
194int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
195		int exception_index);
196
197static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
198				       phys_addr_t pgd_ptr,
199				       unsigned long hyp_stack_ptr,
200				       unsigned long vector_ptr)
201{
202	/*
203	 * Call initialization code, and switch to the full blown HYP
204	 * code. The init code doesn't need to preserve these
205	 * registers as r0-r3 are already callee saved according to
206	 * the AAPCS.
207	 * Note that we slightly misuse the prototype by casing the
208	 * stack pointer to a void *.
209	 *
210	 * We don't have enough registers to perform the full init in
211	 * one go.  Install the boot PGD first, and then install the
212	 * runtime PGD, stack pointer and vectors. The PGDs are always
213	 * passed as the third argument, in order to be passed into
214	 * r2-r3 to the init code (yes, this is compliant with the
215	 * PCS!).
216	 */
217
218	kvm_call_hyp(NULL, 0, boot_pgd_ptr);
219
220	kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
221}
222
223static inline int kvm_arch_dev_ioctl_check_extension(long ext)
224{
225	return 0;
226}
227
228int kvm_perf_init(void);
229int kvm_perf_teardown(void);
230
231u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
232int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
233
234#endif /* __ARM_KVM_HOST_H__ */