xref: /openbmc/linux/arch/arm64/include/asm/kvm_hyp.h (revision 4f205687)
1 /*
2  * Copyright (C) 2015 - ARM Ltd
3  * Author: Marc Zyngier <marc.zyngier@arm.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, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #ifndef __ARM64_KVM_HYP_H__
19 #define __ARM64_KVM_HYP_H__
20 
21 #include <linux/compiler.h>
22 #include <linux/kvm_host.h>
23 #include <asm/kvm_mmu.h>
24 #include <asm/sysreg.h>
25 
26 #define __hyp_text __section(.hyp.text) notrace
27 
28 static inline unsigned long __kern_hyp_va(unsigned long v)
29 {
30 	asm volatile(ALTERNATIVE("and %0, %0, %1",
31 				 "nop",
32 				 ARM64_HAS_VIRT_HOST_EXTN)
33 		     : "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
34 	return v;
35 }
36 
37 #define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
38 
39 static inline unsigned long __hyp_kern_va(unsigned long v)
40 {
41 	u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET;
42 	asm volatile(ALTERNATIVE("add %0, %0, %1",
43 				 "nop",
44 				 ARM64_HAS_VIRT_HOST_EXTN)
45 		     : "+r" (v) : "r" (offset));
46 	return v;
47 }
48 
49 #define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v)))
50 
51 #define read_sysreg_elx(r,nvh,vh)					\
52 	({								\
53 		u64 reg;						\
54 		asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
55 					 "mrs_s %0, " __stringify(r##vh),\
56 					 ARM64_HAS_VIRT_HOST_EXTN)	\
57 			     : "=r" (reg));				\
58 		reg;							\
59 	})
60 
61 #define write_sysreg_elx(v,r,nvh,vh)					\
62 	do {								\
63 		u64 __val = (u64)(v);					\
64 		asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
65 					 "msr_s " __stringify(r##vh) ", %x0",\
66 					 ARM64_HAS_VIRT_HOST_EXTN)	\
67 					 : : "rZ" (__val));		\
68 	} while (0)
69 
70 /*
71  * Unified accessors for registers that have a different encoding
72  * between VHE and non-VHE. They must be specified without their "ELx"
73  * encoding.
74  */
75 #define read_sysreg_el2(r)						\
76 	({								\
77 		u64 reg;						\
78 		asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
79 					 "mrs %0, " __stringify(r##_EL1),\
80 					 ARM64_HAS_VIRT_HOST_EXTN)	\
81 			     : "=r" (reg));				\
82 		reg;							\
83 	})
84 
85 #define write_sysreg_el2(v,r)						\
86 	do {								\
87 		u64 __val = (u64)(v);					\
88 		asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
89 					 "msr " __stringify(r##_EL1) ", %x0",\
90 					 ARM64_HAS_VIRT_HOST_EXTN)	\
91 					 : : "rZ" (__val));		\
92 	} while (0)
93 
94 #define read_sysreg_el0(r)	read_sysreg_elx(r, _EL0, _EL02)
95 #define write_sysreg_el0(v,r)	write_sysreg_elx(v, r, _EL0, _EL02)
96 #define read_sysreg_el1(r)	read_sysreg_elx(r, _EL1, _EL12)
97 #define write_sysreg_el1(v,r)	write_sysreg_elx(v, r, _EL1, _EL12)
98 
99 /* The VHE specific system registers and their encoding */
100 #define sctlr_EL12              sys_reg(3, 5, 1, 0, 0)
101 #define cpacr_EL12              sys_reg(3, 5, 1, 0, 2)
102 #define ttbr0_EL12              sys_reg(3, 5, 2, 0, 0)
103 #define ttbr1_EL12              sys_reg(3, 5, 2, 0, 1)
104 #define tcr_EL12                sys_reg(3, 5, 2, 0, 2)
105 #define afsr0_EL12              sys_reg(3, 5, 5, 1, 0)
106 #define afsr1_EL12              sys_reg(3, 5, 5, 1, 1)
107 #define esr_EL12                sys_reg(3, 5, 5, 2, 0)
108 #define far_EL12                sys_reg(3, 5, 6, 0, 0)
109 #define mair_EL12               sys_reg(3, 5, 10, 2, 0)
110 #define amair_EL12              sys_reg(3, 5, 10, 3, 0)
111 #define vbar_EL12               sys_reg(3, 5, 12, 0, 0)
112 #define contextidr_EL12         sys_reg(3, 5, 13, 0, 1)
113 #define cntkctl_EL12            sys_reg(3, 5, 14, 1, 0)
114 #define cntp_tval_EL02          sys_reg(3, 5, 14, 2, 0)
115 #define cntp_ctl_EL02           sys_reg(3, 5, 14, 2, 1)
116 #define cntp_cval_EL02          sys_reg(3, 5, 14, 2, 2)
117 #define cntv_tval_EL02          sys_reg(3, 5, 14, 3, 0)
118 #define cntv_ctl_EL02           sys_reg(3, 5, 14, 3, 1)
119 #define cntv_cval_EL02          sys_reg(3, 5, 14, 3, 2)
120 #define spsr_EL12               sys_reg(3, 5, 4, 0, 0)
121 #define elr_EL12                sys_reg(3, 5, 4, 0, 1)
122 
123 /**
124  * hyp_alternate_select - Generates patchable code sequences that are
125  * used to switch between two implementations of a function, depending
126  * on the availability of a feature.
127  *
128  * @fname: a symbol name that will be defined as a function returning a
129  * function pointer whose type will match @orig and @alt
130  * @orig: A pointer to the default function, as returned by @fname when
131  * @cond doesn't hold
132  * @alt: A pointer to the alternate function, as returned by @fname
133  * when @cond holds
134  * @cond: a CPU feature (as described in asm/cpufeature.h)
135  */
136 #define hyp_alternate_select(fname, orig, alt, cond)			\
137 typeof(orig) * __hyp_text fname(void)					\
138 {									\
139 	typeof(alt) *val = orig;					\
140 	asm volatile(ALTERNATIVE("nop		\n",			\
141 				 "mov	%0, %1	\n",			\
142 				 cond)					\
143 		     : "+r" (val) : "r" (alt));				\
144 	return val;							\
145 }
146 
147 void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
148 void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
149 
150 void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
151 void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
152 
153 void __timer_save_state(struct kvm_vcpu *vcpu);
154 void __timer_restore_state(struct kvm_vcpu *vcpu);
155 
156 void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
157 void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
158 void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
159 void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
160 void __sysreg32_save_state(struct kvm_vcpu *vcpu);
161 void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
162 
163 void __debug_save_state(struct kvm_vcpu *vcpu,
164 			struct kvm_guest_debug_arch *dbg,
165 			struct kvm_cpu_context *ctxt);
166 void __debug_restore_state(struct kvm_vcpu *vcpu,
167 			   struct kvm_guest_debug_arch *dbg,
168 			   struct kvm_cpu_context *ctxt);
169 void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
170 void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
171 
172 void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
173 void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
174 bool __fpsimd_enabled(void);
175 
176 u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
177 void __noreturn __hyp_do_panic(unsigned long, ...);
178 
179 #endif /* __ARM64_KVM_HYP_H__ */
180 
181