2 * Copyright (C) 2015 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
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.
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.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #ifndef __ARM64_KVM_HYP_H__
19 #define __ARM64_KVM_HYP_H__
21 #include <linux/compiler.h>
22 #include <linux/kvm_host.h>
23 #include <asm/kvm_mmu.h>
24 #include <asm/sysreg.h>
26 #define __hyp_text __section(.hyp.text) notrace
28 #define read_sysreg_elx(r,nvh,vh) \
31 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
32 "mrs_s %0, " __stringify(r##vh),\
33 ARM64_HAS_VIRT_HOST_EXTN) \
38 #define write_sysreg_elx(v,r,nvh,vh) \
40 u64 __val = (u64)(v); \
41 asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
42 "msr_s " __stringify(r##vh) ", %x0",\
43 ARM64_HAS_VIRT_HOST_EXTN) \
48 * Unified accessors for registers that have a different encoding
49 * between VHE and non-VHE. They must be specified without their "ELx"
52 #define read_sysreg_el2(r) \
55 asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
56 "mrs %0, " __stringify(r##_EL1),\
57 ARM64_HAS_VIRT_HOST_EXTN) \
62 #define write_sysreg_el2(v,r) \
64 u64 __val = (u64)(v); \
65 asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
66 "msr " __stringify(r##_EL1) ", %x0",\
67 ARM64_HAS_VIRT_HOST_EXTN) \
71 #define read_sysreg_el0(r) read_sysreg_elx(r, _EL0, _EL02)
72 #define write_sysreg_el0(v,r) write_sysreg_elx(v, r, _EL0, _EL02)
73 #define read_sysreg_el1(r) read_sysreg_elx(r, _EL1, _EL12)
74 #define write_sysreg_el1(v,r) write_sysreg_elx(v, r, _EL1, _EL12)
76 /* The VHE specific system registers and their encoding */
77 #define sctlr_EL12 sys_reg(3, 5, 1, 0, 0)
78 #define cpacr_EL12 sys_reg(3, 5, 1, 0, 2)
79 #define ttbr0_EL12 sys_reg(3, 5, 2, 0, 0)
80 #define ttbr1_EL12 sys_reg(3, 5, 2, 0, 1)
81 #define tcr_EL12 sys_reg(3, 5, 2, 0, 2)
82 #define afsr0_EL12 sys_reg(3, 5, 5, 1, 0)
83 #define afsr1_EL12 sys_reg(3, 5, 5, 1, 1)
84 #define esr_EL12 sys_reg(3, 5, 5, 2, 0)
85 #define far_EL12 sys_reg(3, 5, 6, 0, 0)
86 #define mair_EL12 sys_reg(3, 5, 10, 2, 0)
87 #define amair_EL12 sys_reg(3, 5, 10, 3, 0)
88 #define vbar_EL12 sys_reg(3, 5, 12, 0, 0)
89 #define contextidr_EL12 sys_reg(3, 5, 13, 0, 1)
90 #define cntkctl_EL12 sys_reg(3, 5, 14, 1, 0)
91 #define cntp_tval_EL02 sys_reg(3, 5, 14, 2, 0)
92 #define cntp_ctl_EL02 sys_reg(3, 5, 14, 2, 1)
93 #define cntp_cval_EL02 sys_reg(3, 5, 14, 2, 2)
94 #define cntv_tval_EL02 sys_reg(3, 5, 14, 3, 0)
95 #define cntv_ctl_EL02 sys_reg(3, 5, 14, 3, 1)
96 #define cntv_cval_EL02 sys_reg(3, 5, 14, 3, 2)
97 #define spsr_EL12 sys_reg(3, 5, 4, 0, 0)
98 #define elr_EL12 sys_reg(3, 5, 4, 0, 1)
101 * hyp_alternate_select - Generates patchable code sequences that are
102 * used to switch between two implementations of a function, depending
103 * on the availability of a feature.
105 * @fname: a symbol name that will be defined as a function returning a
106 * function pointer whose type will match @orig and @alt
107 * @orig: A pointer to the default function, as returned by @fname when
109 * @alt: A pointer to the alternate function, as returned by @fname
111 * @cond: a CPU feature (as described in asm/cpufeature.h)
113 #define hyp_alternate_select(fname, orig, alt, cond) \
114 typeof(orig) * __hyp_text fname(void) \
116 typeof(alt) *val = orig; \
117 asm volatile(ALTERNATIVE("nop \n", \
120 : "+r" (val) : "r" (alt)); \
124 void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
125 void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
126 int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu);
128 void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
129 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
130 int __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu);
132 void __timer_save_state(struct kvm_vcpu *vcpu);
133 void __timer_restore_state(struct kvm_vcpu *vcpu);
135 void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
136 void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
137 void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
138 void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
139 void __sysreg32_save_state(struct kvm_vcpu *vcpu);
140 void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
142 void __debug_save_state(struct kvm_vcpu *vcpu,
143 struct kvm_guest_debug_arch *dbg,
144 struct kvm_cpu_context *ctxt);
145 void __debug_restore_state(struct kvm_vcpu *vcpu,
146 struct kvm_guest_debug_arch *dbg,
147 struct kvm_cpu_context *ctxt);
148 void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
149 void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
151 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
152 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
153 bool __fpsimd_enabled(void);
155 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
156 void __noreturn __hyp_do_panic(unsigned long, ...);
158 #endif /* __ARM64_KVM_HYP_H__ */