tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef ASM_KVM_CACHE_REGS_H
2#define ASM_KVM_CACHE_REGS_H
3
4#define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS
5#define KVM_POSSIBLE_CR4_GUEST_BITS \
6 (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
7 | X86_CR4_OSXMMEXCPT | X86_CR4_PGE)
8
9static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu,
10 enum kvm_reg reg)
11{
12 if (!test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail))
13 kvm_x86_ops->cache_reg(vcpu, reg);
14
15 return vcpu->arch.regs[reg];
16}
17
18static inline void kvm_register_write(struct kvm_vcpu *vcpu,
19 enum kvm_reg reg,
20 unsigned long val)
21{
22 vcpu->arch.regs[reg] = val;
23 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
24 __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
25}
26
27static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu)
28{
29 return kvm_register_read(vcpu, VCPU_REGS_RIP);
30}
31
32static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val)
33{
34 kvm_register_write(vcpu, VCPU_REGS_RIP, val);
35}
36
37static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
38{
39 might_sleep(); /* on svm */
40
41 if (!test_bit(VCPU_EXREG_PDPTR,
42 (unsigned long *)&vcpu->arch.regs_avail))
43 kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);
44
45 return vcpu->arch.walk_mmu->pdptrs[index];
46}
47
48static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
49{
50 ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;
51 if (tmask & vcpu->arch.cr0_guest_owned_bits)
52 kvm_x86_ops->decache_cr0_guest_bits(vcpu);
53 return vcpu->arch.cr0 & mask;
54}
55
56static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu)
57{
58 return kvm_read_cr0_bits(vcpu, ~0UL);
59}
60
61static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask)
62{
63 ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS;
64 if (tmask & vcpu->arch.cr4_guest_owned_bits)
65 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
66 return vcpu->arch.cr4 & mask;
67}
68
69static inline ulong kvm_read_cr3(struct kvm_vcpu *vcpu)
70{
71 if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
72 kvm_x86_ops->decache_cr3(vcpu);
73 return vcpu->arch.cr3;
74}
75
76static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu)
77{
78 return kvm_read_cr4_bits(vcpu, ~0UL);
79}
80
81static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu)
82{
83 return (kvm_register_read(vcpu, VCPU_REGS_RAX) & -1u)
84 | ((u64)(kvm_register_read(vcpu, VCPU_REGS_RDX) & -1u) << 32);
85}
86
87static inline void enter_guest_mode(struct kvm_vcpu *vcpu)
88{
89 vcpu->arch.hflags |= HF_GUEST_MASK;
90}
91
92static inline void leave_guest_mode(struct kvm_vcpu *vcpu)
93{
94 vcpu->arch.hflags &= ~HF_GUEST_MASK;
95}
96
97static inline bool is_guest_mode(struct kvm_vcpu *vcpu)
98{
99 return vcpu->arch.hflags & HF_GUEST_MASK;
100}
101
102#endif