1
2#ifndef ASM_KVM_CACHE_REGS_H
3#define ASM_KVM_CACHE_REGS_H
4
5#include <linux/kvm_host.h>
6
7#define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS
8#define KVM_POSSIBLE_CR4_GUEST_BITS \
9 (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
10 | X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_PGE | X86_CR4_TSD)
11
12#define BUILD_KVM_GPR_ACCESSORS(lname, uname) \
13static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)\
14{ \
15 return vcpu->arch.regs[VCPU_REGS_##uname]; \
16} \
17static __always_inline void kvm_##lname##_write(struct kvm_vcpu *vcpu, \
18 unsigned long val) \
19{ \
20 vcpu->arch.regs[VCPU_REGS_##uname] = val; \
21}
22BUILD_KVM_GPR_ACCESSORS(rax, RAX)
23BUILD_KVM_GPR_ACCESSORS(rbx, RBX)
24BUILD_KVM_GPR_ACCESSORS(rcx, RCX)
25BUILD_KVM_GPR_ACCESSORS(rdx, RDX)
26BUILD_KVM_GPR_ACCESSORS(rbp, RBP)
27BUILD_KVM_GPR_ACCESSORS(rsi, RSI)
28BUILD_KVM_GPR_ACCESSORS(rdi, RDI)
29#ifdef CONFIG_X86_64
30BUILD_KVM_GPR_ACCESSORS(r8, R8)
31BUILD_KVM_GPR_ACCESSORS(r9, R9)
32BUILD_KVM_GPR_ACCESSORS(r10, R10)
33BUILD_KVM_GPR_ACCESSORS(r11, R11)
34BUILD_KVM_GPR_ACCESSORS(r12, R12)
35BUILD_KVM_GPR_ACCESSORS(r13, R13)
36BUILD_KVM_GPR_ACCESSORS(r14, R14)
37BUILD_KVM_GPR_ACCESSORS(r15, R15)
38#endif
39
40static inline bool kvm_register_is_available(struct kvm_vcpu *vcpu,
41 enum kvm_reg reg)
42{
43 return test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
44}
45
46static inline bool kvm_register_is_dirty(struct kvm_vcpu *vcpu,
47 enum kvm_reg reg)
48{
49 return test_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
50}
51
52static inline void kvm_register_mark_available(struct kvm_vcpu *vcpu,
53 enum kvm_reg reg)
54{
55 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
56}
57
58static inline void kvm_register_mark_dirty(struct kvm_vcpu *vcpu,
59 enum kvm_reg reg)
60{
61 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
62 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
63}
64
65static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu, int reg)
66{
67 if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))
68 return 0;
69
70 if (!kvm_register_is_available(vcpu, reg))
71 kvm_x86_ops.cache_reg(vcpu, reg);
72
73 return vcpu->arch.regs[reg];
74}
75
76static inline void kvm_register_write(struct kvm_vcpu *vcpu, int reg,
77 unsigned long val)
78{
79 if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))
80 return;
81
82 vcpu->arch.regs[reg] = val;
83 kvm_register_mark_dirty(vcpu, reg);
84}
85
86static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu)
87{
88 return kvm_register_read(vcpu, VCPU_REGS_RIP);
89}
90
91static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val)
92{
93 kvm_register_write(vcpu, VCPU_REGS_RIP, val);
94}
95
96static inline unsigned long kvm_rsp_read(struct kvm_vcpu *vcpu)
97{
98 return kvm_register_read(vcpu, VCPU_REGS_RSP);
99}
100
101static inline void kvm_rsp_write(struct kvm_vcpu *vcpu, unsigned long val)
102{
103 kvm_register_write(vcpu, VCPU_REGS_RSP, val);
104}
105
106static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
107{
108 might_sleep();
109
110 if (!kvm_register_is_available(vcpu, VCPU_EXREG_PDPTR))
111 kvm_x86_ops.cache_reg(vcpu, VCPU_EXREG_PDPTR);
112
113 return vcpu->arch.walk_mmu->pdptrs[index];
114}
115
116static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
117{
118 ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;
119 if ((tmask & vcpu->arch.cr0_guest_owned_bits) &&
120 !kvm_register_is_available(vcpu, VCPU_EXREG_CR0))
121 kvm_x86_ops.cache_reg(vcpu, VCPU_EXREG_CR0);
122 return vcpu->arch.cr0 & mask;
123}
124
125static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu)
126{
127 return kvm_read_cr0_bits(vcpu, ~0UL);
128}
129
130static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask)
131{
132 ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS;
133 if ((tmask & vcpu->arch.cr4_guest_owned_bits) &&
134 !kvm_register_is_available(vcpu, VCPU_EXREG_CR4))
135 kvm_x86_ops.cache_reg(vcpu, VCPU_EXREG_CR4);
136 return vcpu->arch.cr4 & mask;
137}
138
139static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu)
140{
141 if (!kvm_register_is_available(vcpu, VCPU_EXREG_CR3))
142 kvm_x86_ops.cache_reg(vcpu, VCPU_EXREG_CR3);
143 return vcpu->arch.cr3;
144}
145
146static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu)
147{
148 return kvm_read_cr4_bits(vcpu, ~0UL);
149}
150
151static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu)
152{
153 return (kvm_rax_read(vcpu) & -1u)
154 | ((u64)(kvm_rdx_read(vcpu) & -1u) << 32);
155}
156
157static inline void enter_guest_mode(struct kvm_vcpu *vcpu)
158{
159 vcpu->arch.hflags |= HF_GUEST_MASK;
160}
161
162static inline void leave_guest_mode(struct kvm_vcpu *vcpu)
163{
164 vcpu->arch.hflags &= ~HF_GUEST_MASK;
165
166 if (vcpu->arch.load_eoi_exitmap_pending) {
167 vcpu->arch.load_eoi_exitmap_pending = false;
168 kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu);
169 }
170}
171
172static inline bool is_guest_mode(struct kvm_vcpu *vcpu)
173{
174 return vcpu->arch.hflags & HF_GUEST_MASK;
175}
176
177static inline bool is_smm(struct kvm_vcpu *vcpu)
178{
179 return vcpu->arch.hflags & HF_SMM_MASK;
180}
181
182#endif
183
