1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2015 - ARM Ltd
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 */
6
7 #ifndef __ARM64_KVM_HYP_H__
8 #define __ARM64_KVM_HYP_H__
9
10 #include <linux/compiler.h>
11 #include <linux/kvm_host.h>
12 #include <asm/alternative.h>
13 #include <asm/sysreg.h>
14
15 DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
16 DECLARE_PER_CPU(unsigned long, kvm_hyp_vector);
17 DECLARE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
18
19 /*
20 * Unified accessors for registers that have a different encoding
21 * between VHE and non-VHE. They must be specified without their "ELx"
22 * encoding, but with the SYS_ prefix, as defined in asm/sysreg.h.
23 */
24
25 #if defined(__KVM_VHE_HYPERVISOR__)
26
27 #define read_sysreg_el0(r) read_sysreg_s(r##_EL02)
28 #define write_sysreg_el0(v,r) write_sysreg_s(v, r##_EL02)
29 #define read_sysreg_el1(r) read_sysreg_s(r##_EL12)
30 #define write_sysreg_el1(v,r) write_sysreg_s(v, r##_EL12)
31 #define read_sysreg_el2(r) read_sysreg_s(r##_EL1)
32 #define write_sysreg_el2(v,r) write_sysreg_s(v, r##_EL1)
33
34 #else // !__KVM_VHE_HYPERVISOR__
35
36 #if defined(__KVM_NVHE_HYPERVISOR__)
37 #define VHE_ALT_KEY ARM64_KVM_HVHE
38 #else
39 #define VHE_ALT_KEY ARM64_HAS_VIRT_HOST_EXTN
40 #endif
41
42 #define read_sysreg_elx(r,nvh,vh) \
43 ({ \
44 u64 reg; \
45 asm volatile(ALTERNATIVE(__mrs_s("%0", r##nvh), \
46 __mrs_s("%0", r##vh), \
47 VHE_ALT_KEY) \
48 : "=r" (reg)); \
49 reg; \
50 })
51
52 #define write_sysreg_elx(v,r,nvh,vh) \
53 do { \
54 u64 __val = (u64)(v); \
55 asm volatile(ALTERNATIVE(__msr_s(r##nvh, "%x0"), \
56 __msr_s(r##vh, "%x0"), \
57 VHE_ALT_KEY) \
58 : : "rZ" (__val)); \
59 } while (0)
60
61 #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02)
62 #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02)
63 #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12)
64 #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
65 #define read_sysreg_el2(r) read_sysreg_elx(r, _EL2, _EL1)
66 #define write_sysreg_el2(v,r) write_sysreg_elx(v, r, _EL2, _EL1)
67
68 #endif // __KVM_VHE_HYPERVISOR__
69
70 /*
71 * Without an __arch_swab32(), we fall back to ___constant_swab32(), but the
72 * static inline can allow the compiler to out-of-line this. KVM always wants
73 * the macro version as it's always inlined.
74 */
75 #define __kvm_swab32(x) ___constant_swab32(x)
76
77 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
78
79 void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
80 void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
81 void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
82 void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
83 void __vgic_v3_save_vmcr_aprs(struct vgic_v3_cpu_if *cpu_if);
84 void __vgic_v3_restore_vmcr_aprs(struct vgic_v3_cpu_if *cpu_if);
85 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
86
87 #ifdef __KVM_NVHE_HYPERVISOR__
88 void __timer_enable_traps(struct kvm_vcpu *vcpu);
89 void __timer_disable_traps(struct kvm_vcpu *vcpu);
90 #endif
91
92 #ifdef __KVM_NVHE_HYPERVISOR__
93 void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
94 void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
95 #else
96 void __vcpu_load_switch_sysregs(struct kvm_vcpu *vcpu);
97 void __vcpu_put_switch_sysregs(struct kvm_vcpu *vcpu);
98 void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
99 void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
100 void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
101 void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
102 #endif
103
104 void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
105 void __debug_switch_to_host(struct kvm_vcpu *vcpu);
106
107 #ifdef __KVM_NVHE_HYPERVISOR__
108 void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu);
109 void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
110 #endif
111
112 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
113 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
114 void __sve_save_state(void *sve_pffr, u32 *fpsr, int save_ffr);
115 void __sve_restore_state(void *sve_pffr, u32 *fpsr, int restore_ffr);
116
117 u64 __guest_enter(struct kvm_vcpu *vcpu);
118
119 bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt, u32 func_id);
120
121 #ifdef __KVM_NVHE_HYPERVISOR__
122 void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
123 u64 elr, u64 par);
124 #endif
125
126 #ifdef __KVM_NVHE_HYPERVISOR__
127 void __pkvm_init_switch_pgd(phys_addr_t pgd, unsigned long sp,
128 void (*fn)(void));
129 int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
130 unsigned long *per_cpu_base, u32 hyp_va_bits);
131 void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
132 #endif
133
134 extern u64 kvm_nvhe_sym(id_aa64pfr0_el1_sys_val);
135 extern u64 kvm_nvhe_sym(id_aa64pfr1_el1_sys_val);
136 extern u64 kvm_nvhe_sym(id_aa64isar0_el1_sys_val);
137 extern u64 kvm_nvhe_sym(id_aa64isar1_el1_sys_val);
138 extern u64 kvm_nvhe_sym(id_aa64isar2_el1_sys_val);
139 extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val);
140 extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val);
141 extern u64 kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val);
142 extern u64 kvm_nvhe_sym(id_aa64smfr0_el1_sys_val);
143
144 extern unsigned long kvm_nvhe_sym(__icache_flags);
145 extern unsigned int kvm_nvhe_sym(kvm_arm_vmid_bits);
146 extern unsigned int kvm_nvhe_sym(kvm_host_sve_max_vl);
147
148 #endif /* __ARM64_KVM_HYP_H__ */
149
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