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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/arch/arm64/include/asm/kvm_asm.h
....@@ -1,91 +1,212 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * Copyright (C) 2012,2013 - ARM Ltd
34  * 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/>.
165  */
176 
187 #ifndef __ARM_KVM_ASM_H__
198 #define __ARM_KVM_ASM_H__
209 
10
+#include <asm/hyp_image.h>
2111 #include <asm/virt.h>
22
-
23
-#define	VCPU_WORKAROUND_2_FLAG_SHIFT	0
24
-#define	VCPU_WORKAROUND_2_FLAG		(_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
2512 
2613 #define ARM_EXIT_WITH_SERROR_BIT  31
2714 #define ARM_EXCEPTION_CODE(x)	  ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
15
+#define ARM_EXCEPTION_IS_TRAP(x)  (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
2816 #define ARM_SERROR_PENDING(x)	  !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
2917 
3018 #define ARM_EXCEPTION_IRQ	  0
3119 #define ARM_EXCEPTION_EL1_SERROR  1
3220 #define ARM_EXCEPTION_TRAP	  2
21
+#define ARM_EXCEPTION_IL	  3
3322 /* The hyp-stub will return this for any kvm_call_hyp() call */
3423 #define ARM_EXCEPTION_HYP_GONE	  HVC_STUB_ERR
24
+
25
+#define kvm_arm_exception_type					\
26
+	{ARM_EXCEPTION_IRQ,		"IRQ"		},	\
27
+	{ARM_EXCEPTION_EL1_SERROR, 	"SERROR"	},	\
28
+	{ARM_EXCEPTION_TRAP, 		"TRAP"		},	\
29
+	{ARM_EXCEPTION_HYP_GONE,	"HYP_GONE"	}
30
+
31
+/*
32
+ * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
33
+ * that jumps over this.
34
+ */
35
+#define KVM_VECTOR_PREAMBLE	(2 * AARCH64_INSN_SIZE)
36
+
37
+#define KVM_HOST_SMCCC_ID(id)						\
38
+	ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,				\
39
+			   ARM_SMCCC_SMC_64,				\
40
+			   ARM_SMCCC_OWNER_VENDOR_HYP,			\
41
+			   (id))
42
+
43
+#define KVM_HOST_SMCCC_FUNC(name) KVM_HOST_SMCCC_ID(__KVM_HOST_SMCCC_FUNC_##name)
44
+
45
+#define __KVM_HOST_SMCCC_FUNC___kvm_hyp_init			0
46
+#define __KVM_HOST_SMCCC_FUNC___kvm_vcpu_run			1
47
+#define __KVM_HOST_SMCCC_FUNC___kvm_flush_vm_context		2
48
+#define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid_ipa		3
49
+#define __KVM_HOST_SMCCC_FUNC___kvm_tlb_flush_vmid		4
50
+#define __KVM_HOST_SMCCC_FUNC___kvm_flush_cpu_context		5
51
+#define __KVM_HOST_SMCCC_FUNC___kvm_timer_set_cntvoff		6
52
+#define __KVM_HOST_SMCCC_FUNC___kvm_enable_ssbs			7
53
+#define __KVM_HOST_SMCCC_FUNC___vgic_v3_get_gic_config		8
54
+#define __KVM_HOST_SMCCC_FUNC___vgic_v3_read_vmcr		9
55
+#define __KVM_HOST_SMCCC_FUNC___vgic_v3_write_vmcr		10
56
+#define __KVM_HOST_SMCCC_FUNC___vgic_v3_init_lrs		11
57
+#define __KVM_HOST_SMCCC_FUNC___kvm_get_mdcr_el2		12
58
+#define __KVM_HOST_SMCCC_FUNC___vgic_v3_save_aprs		13
59
+#define __KVM_HOST_SMCCC_FUNC___vgic_v3_restore_aprs		14
60
+#define __KVM_HOST_SMCCC_FUNC___pkvm_init			15
61
+#define __KVM_HOST_SMCCC_FUNC___pkvm_create_mappings		16
62
+#define __KVM_HOST_SMCCC_FUNC___pkvm_create_private_mapping	17
63
+#define __KVM_HOST_SMCCC_FUNC___pkvm_cpu_set_vector		18
64
+#define __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize		19
65
+#define __KVM_HOST_SMCCC_FUNC___pkvm_mark_hyp			20
3566 
3667 #ifndef __ASSEMBLY__
3768 
3869 #include <linux/mm.h>
3970 
40
-/* Translate a kernel address of @sym into its equivalent linear mapping */
41
-#define kvm_ksym_ref(sym)						\
71
+#define DECLARE_KVM_VHE_SYM(sym)	extern char sym[]
72
+#define DECLARE_KVM_NVHE_SYM(sym)	extern char kvm_nvhe_sym(sym)[]
73
+
74
+/*
75
+ * Define a pair of symbols sharing the same name but one defined in
76
+ * VHE and the other in nVHE hyp implementations.
77
+ */
78
+#define DECLARE_KVM_HYP_SYM(sym)		\
79
+	DECLARE_KVM_VHE_SYM(sym);		\
80
+	DECLARE_KVM_NVHE_SYM(sym)
81
+
82
+#define DECLARE_KVM_VHE_PER_CPU(type, sym)	\
83
+	DECLARE_PER_CPU(type, sym)
84
+#define DECLARE_KVM_NVHE_PER_CPU(type, sym)	\
85
+	DECLARE_PER_CPU(type, kvm_nvhe_sym(sym))
86
+
87
+#define DECLARE_KVM_HYP_PER_CPU(type, sym)	\
88
+	DECLARE_KVM_VHE_PER_CPU(type, sym);	\
89
+	DECLARE_KVM_NVHE_PER_CPU(type, sym)
90
+
91
+/*
92
+ * Compute pointer to a symbol defined in nVHE percpu region.
93
+ * Returns NULL if percpu memory has not been allocated yet.
94
+ */
95
+#define this_cpu_ptr_nvhe_sym(sym)	per_cpu_ptr_nvhe_sym(sym, smp_processor_id())
96
+#define per_cpu_ptr_nvhe_sym(sym, cpu)						\
97
+	({									\
98
+		unsigned long base, off;					\
99
+		base = kvm_arm_hyp_percpu_base[cpu];				\
100
+		off = (unsigned long)&CHOOSE_NVHE_SYM(sym) -			\
101
+		      (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start);		\
102
+		base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL;	\
103
+	})
104
+
105
+#if defined(__KVM_NVHE_HYPERVISOR__)
106
+
107
+#define CHOOSE_NVHE_SYM(sym)	sym
108
+#define CHOOSE_HYP_SYM(sym)	CHOOSE_NVHE_SYM(sym)
109
+
110
+/* The nVHE hypervisor shouldn't even try to access VHE symbols */
111
+extern void *__nvhe_undefined_symbol;
112
+#define CHOOSE_VHE_SYM(sym)		__nvhe_undefined_symbol
113
+#define this_cpu_ptr_hyp_sym(sym)	(&__nvhe_undefined_symbol)
114
+#define per_cpu_ptr_hyp_sym(sym, cpu)	(&__nvhe_undefined_symbol)
115
+
116
+#elif defined(__KVM_VHE_HYPERVISOR__)
117
+
118
+#define CHOOSE_VHE_SYM(sym)	sym
119
+#define CHOOSE_HYP_SYM(sym)	CHOOSE_VHE_SYM(sym)
120
+
121
+/* The VHE hypervisor shouldn't even try to access nVHE symbols */
122
+extern void *__vhe_undefined_symbol;
123
+#define CHOOSE_NVHE_SYM(sym)		__vhe_undefined_symbol
124
+#define this_cpu_ptr_hyp_sym(sym)	(&__vhe_undefined_symbol)
125
+#define per_cpu_ptr_hyp_sym(sym, cpu)	(&__vhe_undefined_symbol)
126
+
127
+#else
128
+
129
+/*
130
+ * BIG FAT WARNINGS:
131
+ *
132
+ * - Don't be tempted to change the following is_kernel_in_hyp_mode()
133
+ *   to has_vhe(). has_vhe() is implemented as a *final* capability,
134
+ *   while this is used early at boot time, when the capabilities are
135
+ *   not final yet....
136
+ *
137
+ * - Don't let the nVHE hypervisor have access to this, as it will
138
+ *   pick the *wrong* symbol (yes, it runs at EL2...).
139
+ */
140
+#define CHOOSE_HYP_SYM(sym)		(is_kernel_in_hyp_mode()	\
141
+					   ? CHOOSE_VHE_SYM(sym)	\
142
+					   : CHOOSE_NVHE_SYM(sym))
143
+
144
+#define this_cpu_ptr_hyp_sym(sym)	(is_kernel_in_hyp_mode()	\
145
+					   ? this_cpu_ptr(&sym)		\
146
+					   : this_cpu_ptr_nvhe_sym(sym))
147
+
148
+#define per_cpu_ptr_hyp_sym(sym, cpu)	(is_kernel_in_hyp_mode()	\
149
+					   ? per_cpu_ptr(&sym, cpu)	\
150
+					   : per_cpu_ptr_nvhe_sym(sym, cpu))
151
+
152
+#define CHOOSE_VHE_SYM(sym)	sym
153
+#define CHOOSE_NVHE_SYM(sym)	kvm_nvhe_sym(sym)
154
+
155
+#endif
156
+
157
+struct kvm_nvhe_init_params {
158
+	unsigned long mair_el2;
159
+	unsigned long tcr_el2;
160
+	unsigned long tpidr_el2;
161
+	unsigned long stack_hyp_va;
162
+	phys_addr_t pgd_pa;
163
+	unsigned long hcr_el2;
164
+	unsigned long vttbr;
165
+	unsigned long vtcr;
166
+};
167
+
168
+/* Translate a kernel address @ptr into its equivalent linear mapping */
169
+#define kvm_ksym_ref(ptr)						\
42170 	({								\
43
-		void *val = &sym;					\
171
+		void *val = (ptr);					\
44172 		if (!is_kernel_in_hyp_mode())				\
45
-			val = lm_alias(&sym);				\
173
+			val = lm_alias((ptr));				\
46174 		val;							\
47175 	 })
176
+#define kvm_ksym_ref_nvhe(sym)	kvm_ksym_ref(__va_function(kvm_nvhe_sym(sym)))
48177 
49178 struct kvm;
50179 struct kvm_vcpu;
180
+struct kvm_s2_mmu;
51181 
52
-extern char __kvm_hyp_init[];
53
-extern char __kvm_hyp_init_end[];
182
+DECLARE_KVM_NVHE_SYM(__kvm_hyp_init);
183
+DECLARE_KVM_HYP_SYM(__kvm_hyp_vector);
184
+#define __kvm_hyp_init		CHOOSE_NVHE_SYM(__kvm_hyp_init)
185
+#define __kvm_hyp_vector	CHOOSE_HYP_SYM(__kvm_hyp_vector)
54186 
55
-extern char __kvm_hyp_vector[];
187
+extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
188
+DECLARE_KVM_NVHE_SYM(__per_cpu_start);
189
+DECLARE_KVM_NVHE_SYM(__per_cpu_end);
190
+
191
+DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs);
192
+#define __bp_harden_hyp_vecs	CHOOSE_HYP_SYM(__bp_harden_hyp_vecs)
56193 
57194 extern void __kvm_flush_vm_context(void);
58
-extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
59
-extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
60
-extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
195
+extern void __kvm_flush_cpu_context(struct kvm_s2_mmu *mmu);
196
+extern void __kvm_tlb_flush_vmid_ipa(struct kvm_s2_mmu *mmu, phys_addr_t ipa,
197
+				     int level);
198
+extern void __kvm_tlb_flush_vmid(struct kvm_s2_mmu *mmu);
61199 
62
-extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
200
+extern void __kvm_timer_set_cntvoff(u64 cntvoff);
63201 
64
-extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
202
+extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
65203 
66
-extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
67
-
68
-extern u64 __vgic_v3_get_ich_vtr_el2(void);
204
+extern u64 __vgic_v3_get_gic_config(void);
69205 extern u64 __vgic_v3_read_vmcr(void);
70206 extern void __vgic_v3_write_vmcr(u32 vmcr);
71207 extern void __vgic_v3_init_lrs(void);
72208 
73209 extern u32 __kvm_get_mdcr_el2(void);
74
-
75
-extern u32 __init_stage2_translation(void);
76
-
77
-/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
78
-#define __hyp_this_cpu_ptr(sym)						\
79
-	({								\
80
-		void *__ptr = hyp_symbol_addr(sym);			\
81
-		__ptr += read_sysreg(tpidr_el2);			\
82
-		(typeof(&sym))__ptr;					\
83
-	 })
84
-
85
-#define __hyp_this_cpu_read(sym)					\
86
-	({								\
87
-		*__hyp_this_cpu_ptr(sym);				\
88
-	 })
89210 
90211 #define __KVM_EXTABLE(from, to)						\
91212 	"	.pushsection	__kvm_ex_table, \"a\"\n"		\
....@@ -117,26 +238,24 @@
117238 
118239 #else /* __ASSEMBLY__ */
119240 
120
-.macro hyp_adr_this_cpu reg, sym, tmp
121
-	adr_l	\reg, \sym
122
-	mrs	\tmp, tpidr_el2
123
-	add	\reg, \reg, \tmp
124
-.endm
125
-
126
-.macro hyp_ldr_this_cpu reg, sym, tmp
127
-	adr_l	\reg, \sym
128
-	mrs	\tmp, tpidr_el2
129
-	ldr	\reg,  [\reg, \tmp]
130
-.endm
131
-
132241 .macro get_host_ctxt reg, tmp
133
-	hyp_adr_this_cpu \reg, kvm_host_cpu_state, \tmp
242
+	adr_this_cpu \reg, kvm_host_data, \tmp
243
+	add	\reg, \reg, #HOST_DATA_CONTEXT
134244 .endm
135245 
136246 .macro get_vcpu_ptr vcpu, ctxt
137247 	get_host_ctxt \ctxt, \vcpu
138248 	ldr	\vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
139
-	kern_hyp_va	\vcpu
249
+.endm
250
+
251
+.macro get_loaded_vcpu vcpu, ctxt
252
+	adr_this_cpu \ctxt, kvm_hyp_ctxt, \vcpu
253
+	ldr	\vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
254
+.endm
255
+
256
+.macro set_loaded_vcpu vcpu, ctxt, tmp
257
+	adr_this_cpu \ctxt, kvm_hyp_ctxt, \tmp
258
+	str	\vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
140259 .endm
141260 
142261 /*
....@@ -154,6 +273,45 @@
154273 	.popsection
155274 .endm
156275 
276
+#define CPU_XREG_OFFSET(x)	(CPU_USER_PT_REGS + 8*x)
277
+#define CPU_LR_OFFSET		CPU_XREG_OFFSET(30)
278
+#define CPU_SP_EL0_OFFSET	(CPU_LR_OFFSET + 8)
279
+
280
+/*
281
+ * We treat x18 as callee-saved as the host may use it as a platform
282
+ * register (e.g. for shadow call stack).
283
+ */
284
+.macro save_callee_saved_regs ctxt
285
+	str	x18,      [\ctxt, #CPU_XREG_OFFSET(18)]
286
+	stp	x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
287
+	stp	x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
288
+	stp	x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
289
+	stp	x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
290
+	stp	x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
291
+	stp	x29, lr,  [\ctxt, #CPU_XREG_OFFSET(29)]
292
+.endm
293
+
294
+.macro restore_callee_saved_regs ctxt
295
+	// We require \ctxt is not x18-x28
296
+	ldr	x18,      [\ctxt, #CPU_XREG_OFFSET(18)]
297
+	ldp	x19, x20, [\ctxt, #CPU_XREG_OFFSET(19)]
298
+	ldp	x21, x22, [\ctxt, #CPU_XREG_OFFSET(21)]
299
+	ldp	x23, x24, [\ctxt, #CPU_XREG_OFFSET(23)]
300
+	ldp	x25, x26, [\ctxt, #CPU_XREG_OFFSET(25)]
301
+	ldp	x27, x28, [\ctxt, #CPU_XREG_OFFSET(27)]
302
+	ldp	x29, lr,  [\ctxt, #CPU_XREG_OFFSET(29)]
303
+.endm
304
+
305
+.macro save_sp_el0 ctxt, tmp
306
+	mrs	\tmp,	sp_el0
307
+	str	\tmp,	[\ctxt, #CPU_SP_EL0_OFFSET]
308
+.endm
309
+
310
+.macro restore_sp_el0 ctxt, tmp
311
+	ldr	\tmp,	  [\ctxt, #CPU_SP_EL0_OFFSET]
312
+	msr	sp_el0, \tmp
313
+.endm
314
+
157315 #endif
158316 
159317 #endif /* __ARM_KVM_ASM_H__ */