xref: /openbmc/linux/arch/arm64/include/asm/kvm_asm.h (revision 32ced09d)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2012,2013 - ARM Ltd
4  * Author: Marc Zyngier <marc.zyngier@arm.com>
5  */
6 
7 #ifndef __ARM_KVM_ASM_H__
8 #define __ARM_KVM_ASM_H__
9 
10 #include <asm/virt.h>
11 
12 #define	VCPU_WORKAROUND_2_FLAG_SHIFT	0
13 #define	VCPU_WORKAROUND_2_FLAG		(_AC(1, UL) << VCPU_WORKAROUND_2_FLAG_SHIFT)
14 
15 #define ARM_EXIT_WITH_SERROR_BIT  31
16 #define ARM_EXCEPTION_CODE(x)	  ((x) & ~(1U << ARM_EXIT_WITH_SERROR_BIT))
17 #define ARM_EXCEPTION_IS_TRAP(x)  (ARM_EXCEPTION_CODE((x)) == ARM_EXCEPTION_TRAP)
18 #define ARM_SERROR_PENDING(x)	  !!((x) & (1U << ARM_EXIT_WITH_SERROR_BIT))
19 
20 #define ARM_EXCEPTION_IRQ	  0
21 #define ARM_EXCEPTION_EL1_SERROR  1
22 #define ARM_EXCEPTION_TRAP	  2
23 #define ARM_EXCEPTION_IL	  3
24 /* The hyp-stub will return this for any kvm_call_hyp() call */
25 #define ARM_EXCEPTION_HYP_GONE	  HVC_STUB_ERR
26 
27 #define kvm_arm_exception_type					\
28 	{ARM_EXCEPTION_IRQ,		"IRQ"		},	\
29 	{ARM_EXCEPTION_EL1_SERROR, 	"SERROR"	},	\
30 	{ARM_EXCEPTION_TRAP, 		"TRAP"		},	\
31 	{ARM_EXCEPTION_HYP_GONE,	"HYP_GONE"	}
32 
33 /*
34  * Size of the HYP vectors preamble. kvm_patch_vector_branch() generates code
35  * that jumps over this.
36  */
37 #define KVM_VECTOR_PREAMBLE	(2 * AARCH64_INSN_SIZE)
38 
39 #ifndef __ASSEMBLY__
40 
41 #include <linux/mm.h>
42 
43 /* Translate a kernel address of @sym into its equivalent linear mapping */
44 #define kvm_ksym_ref(sym)						\
45 	({								\
46 		void *val = &sym;					\
47 		if (!is_kernel_in_hyp_mode())				\
48 			val = lm_alias(&sym);				\
49 		val;							\
50 	 })
51 
52 struct kvm;
53 struct kvm_vcpu;
54 
55 extern char __kvm_hyp_init[];
56 extern char __kvm_hyp_init_end[];
57 
58 extern char __kvm_hyp_vector[];
59 
60 extern void __kvm_flush_vm_context(void);
61 extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
62 extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
63 extern void __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu);
64 
65 extern void __kvm_timer_set_cntvoff(u32 cntvoff_low, u32 cntvoff_high);
66 
67 extern int kvm_vcpu_run_vhe(struct kvm_vcpu *vcpu);
68 
69 extern int __kvm_vcpu_run_nvhe(struct kvm_vcpu *vcpu);
70 
71 extern u64 __vgic_v3_get_ich_vtr_el2(void);
72 extern u64 __vgic_v3_read_vmcr(void);
73 extern void __vgic_v3_write_vmcr(u32 vmcr);
74 extern void __vgic_v3_init_lrs(void);
75 
76 extern u32 __kvm_get_mdcr_el2(void);
77 
78 /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
79 #define __hyp_this_cpu_ptr(sym)						\
80 	({								\
81 		void *__ptr = hyp_symbol_addr(sym);			\
82 		__ptr += read_sysreg(tpidr_el2);			\
83 		(typeof(&sym))__ptr;					\
84 	 })
85 
86 #define __hyp_this_cpu_read(sym)					\
87 	({								\
88 		*__hyp_this_cpu_ptr(sym);				\
89 	 })
90 
91 #else /* __ASSEMBLY__ */
92 
93 .macro hyp_adr_this_cpu reg, sym, tmp
94 	adr_l	\reg, \sym
95 	mrs	\tmp, tpidr_el2
96 	add	\reg, \reg, \tmp
97 .endm
98 
99 .macro hyp_ldr_this_cpu reg, sym, tmp
100 	adr_l	\reg, \sym
101 	mrs	\tmp, tpidr_el2
102 	ldr	\reg,  [\reg, \tmp]
103 .endm
104 
105 .macro get_host_ctxt reg, tmp
106 	hyp_adr_this_cpu \reg, kvm_host_data, \tmp
107 	add	\reg, \reg, #HOST_DATA_CONTEXT
108 .endm
109 
110 .macro get_vcpu_ptr vcpu, ctxt
111 	get_host_ctxt \ctxt, \vcpu
112 	ldr	\vcpu, [\ctxt, #HOST_CONTEXT_VCPU]
113 	kern_hyp_va	\vcpu
114 .endm
115 
116 #endif
117 
118 #endif /* __ARM_KVM_ASM_H__ */
119