kvm_hyp.h

  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
 79u64 __gic_v3_get_lr(unsigned int lr);
 80void __gic_v3_set_lr(u64 val, int lr);
 81
 82void __vgic_v3_save_state(struct vgic_v3_cpu_if *cpu_if);
 83void __vgic_v3_restore_state(struct vgic_v3_cpu_if *cpu_if);
 84void __vgic_v3_activate_traps(struct vgic_v3_cpu_if *cpu_if);
 85void __vgic_v3_deactivate_traps(struct vgic_v3_cpu_if *cpu_if);
 86void __vgic_v3_save_aprs(struct vgic_v3_cpu_if *cpu_if);
 87void __vgic_v3_restore_vmcr_aprs(struct vgic_v3_cpu_if *cpu_if);
 88int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
 89
 90#ifdef __KVM_NVHE_HYPERVISOR__
 91void __timer_enable_traps(struct kvm_vcpu *vcpu);
 92void __timer_disable_traps(struct kvm_vcpu *vcpu);
 93#endif
 94
 95#ifdef __KVM_NVHE_HYPERVISOR__
 96void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt);
 97void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt);
 98#else
 99void __vcpu_load_switch_sysregs(struct kvm_vcpu *vcpu);
100void __vcpu_put_switch_sysregs(struct kvm_vcpu *vcpu);
101void sysreg_save_host_state_vhe(struct kvm_cpu_context *ctxt);
102void sysreg_restore_host_state_vhe(struct kvm_cpu_context *ctxt);
103void sysreg_save_guest_state_vhe(struct kvm_cpu_context *ctxt);
104void sysreg_restore_guest_state_vhe(struct kvm_cpu_context *ctxt);
105#endif
106
107void __debug_switch_to_guest(struct kvm_vcpu *vcpu);
108void __debug_switch_to_host(struct kvm_vcpu *vcpu);
109
110#ifdef __KVM_NVHE_HYPERVISOR__
111void __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu);
112void __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu);
113#endif
114
115void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
116void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
117void __sve_save_state(void *sve_pffr, u32 *fpsr, int save_ffr);
118void __sve_restore_state(void *sve_pffr, u32 *fpsr, int restore_ffr);
119
120u64 __guest_enter(struct kvm_vcpu *vcpu);
121
122bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt, u32 func_id);
123
124#ifdef __KVM_NVHE_HYPERVISOR__
125void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
126			       u64 elr, u64 par);
127#endif
128
129#ifdef __KVM_NVHE_HYPERVISOR__
130void __pkvm_init_switch_pgd(phys_addr_t pgd, unsigned long sp,
131		void (*fn)(void));
132int __pkvm_init(phys_addr_t phys, unsigned long size, unsigned long nr_cpus,
133		unsigned long *per_cpu_base, u32 hyp_va_bits);
134void __noreturn __host_enter(struct kvm_cpu_context *host_ctxt);
135#endif
136
137extern u64 kvm_nvhe_sym(id_aa64pfr0_el1_sys_val);
138extern u64 kvm_nvhe_sym(id_aa64pfr1_el1_sys_val);
139extern u64 kvm_nvhe_sym(id_aa64isar0_el1_sys_val);
140extern u64 kvm_nvhe_sym(id_aa64isar1_el1_sys_val);
141extern u64 kvm_nvhe_sym(id_aa64isar2_el1_sys_val);
142extern u64 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val);
143extern u64 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val);
144extern u64 kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val);
145extern u64 kvm_nvhe_sym(id_aa64smfr0_el1_sys_val);
146
147extern unsigned long kvm_nvhe_sym(__icache_flags);
148extern unsigned int kvm_nvhe_sym(kvm_arm_vmid_bits);
149extern unsigned int kvm_nvhe_sym(kvm_host_sve_max_vl);
150
151#endif /* __ARM64_KVM_HYP_H__ */