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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
15DECLARE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
16DECLARE_PER_CPU(unsigned long, kvm_hyp_vector);
17DECLARE_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
77int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
78
79void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
80void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
81void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
82void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
83void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
84void __vgic_v3_restore_aprs(struct vgic_v3_cpu_if *cpu_if);
85int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
86
87#ifdef __KVM_NVHE_HYPERVISOR__
88void __timer_enable_traps(struct kvm_vcpu *vcpu);
89void __timer_disable_traps(struct kvm_vcpu *vcpu);
90#endif
91
92#ifdef __KVM_NVHE_HYPERVISOR__
93void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
94void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
95#else
96void __vcpu_load_switch_sysregs(struct kvm_vcpu *vcpu);
97void __vcpu_put_switch_sysregs(struct kvm_vcpu *vcpu);
98void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
99void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
100void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
101void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
102#endif
103
104void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
105void __debug_switch_to_host(struct kvm_vcpu *vcpu);
106
107#ifdef __KVM_NVHE_HYPERVISOR__
108void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu);
109void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
110#endif
111
112void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
113void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
114void __sve_restore_state(void *sve_pffr, u32 *fpsr);
115
116u64 __guest_enter(struct kvm_vcpu *vcpu);
117
118bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt, u32 func_id);
119
120#ifdef __KVM_NVHE_HYPERVISOR__
121void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
122 u64 elr, u64 par);
123#endif
124
125#ifdef __KVM_NVHE_HYPERVISOR__
126void __pkvm_init_switch_pgd(phys_addr_t phys, unsigned long size,
127 phys_addr_t pgd, void *sp, void *cont_fn);
128int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
129 unsigned long *per_cpu_base, u32 hyp_va_bits);
130void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
131#endif
132
133extern u64 kvm_nvhe_sym(id_aa64pfr0_el1_sys_val);
134extern u64 kvm_nvhe_sym(id_aa64pfr1_el1_sys_val);
135extern u64 kvm_nvhe_sym(id_aa64isar0_el1_sys_val);
136extern u64 kvm_nvhe_sym(id_aa64isar1_el1_sys_val);
137extern u64 kvm_nvhe_sym(id_aa64isar2_el1_sys_val);
138extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val);
139extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val);
140extern u64 kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val);
141extern u64 kvm_nvhe_sym(id_aa64smfr0_el1_sys_val);
142
143extern unsigned long kvm_nvhe_sym(__icache_flags);
144extern unsigned int kvm_nvhe_sym(kvm_arm_vmid_bits);
145
146#endif /* __ARM64_KVM_HYP_H__ */