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Diffstat (limited to 'arch/arm64/kvm/inject_fault.c')
-rw-r--r--arch/arm64/kvm/inject_fault.c88
1 files changed, 3 insertions, 85 deletions
diff --git a/arch/arm64/kvm/inject_fault.c b/arch/arm64/kvm/inject_fault.c
index 3556715a774e..8ecbcb40e317 100644
--- a/arch/arm64/kvm/inject_fault.c
+++ b/arch/arm64/kvm/inject_fault.c
@@ -33,88 +33,6 @@
33#define LOWER_EL_AArch64_VECTOR 0x400 33#define LOWER_EL_AArch64_VECTOR 0x400
34#define LOWER_EL_AArch32_VECTOR 0x600 34#define LOWER_EL_AArch32_VECTOR 0x600
35 35
36/*
37 * Table taken from ARMv8 ARM DDI0487B-B, table G1-10.
38 */
39static const u8 return_offsets[8][2] = {
40 [0] = { 0, 0 }, /* Reset, unused */
41 [1] = { 4, 2 }, /* Undefined */
42 [2] = { 0, 0 }, /* SVC, unused */
43 [3] = { 4, 4 }, /* Prefetch abort */
44 [4] = { 8, 8 }, /* Data abort */
45 [5] = { 0, 0 }, /* HVC, unused */
46 [6] = { 4, 4 }, /* IRQ, unused */
47 [7] = { 4, 4 }, /* FIQ, unused */
48};
49
50static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)
51{
52 unsigned long cpsr;
53 unsigned long new_spsr_value = *vcpu_cpsr(vcpu);
54 bool is_thumb = (new_spsr_value & COMPAT_PSR_T_BIT);
55 u32 return_offset = return_offsets[vect_offset >> 2][is_thumb];
56 u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
57
58 cpsr = mode | COMPAT_PSR_I_BIT;
59
60 if (sctlr & (1 << 30))
61 cpsr |= COMPAT_PSR_T_BIT;
62 if (sctlr & (1 << 25))
63 cpsr |= COMPAT_PSR_E_BIT;
64
65 *vcpu_cpsr(vcpu) = cpsr;
66
67 /* Note: These now point to the banked copies */
68 *vcpu_spsr(vcpu) = new_spsr_value;
69 *vcpu_reg32(vcpu, 14) = *vcpu_pc(vcpu) + return_offset;
70
71 /* Branch to exception vector */
72 if (sctlr & (1 << 13))
73 vect_offset += 0xffff0000;
74 else /* always have security exceptions */
75 vect_offset += vcpu_cp15(vcpu, c12_VBAR);
76
77 *vcpu_pc(vcpu) = vect_offset;
78}
79
80static void inject_undef32(struct kvm_vcpu *vcpu)
81{
82 prepare_fault32(vcpu, COMPAT_PSR_MODE_UND, 4);
83}
84
85/*
86 * Modelled after TakeDataAbortException() and TakePrefetchAbortException
87 * pseudocode.
88 */
89static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
90 unsigned long addr)
91{
92 u32 vect_offset;
93 u32 *far, *fsr;
94 bool is_lpae;
95
96 if (is_pabt) {
97 vect_offset = 12;
98 far = &vcpu_cp15(vcpu, c6_IFAR);
99 fsr = &vcpu_cp15(vcpu, c5_IFSR);
100 } else { /* !iabt */
101 vect_offset = 16;
102 far = &vcpu_cp15(vcpu, c6_DFAR);
103 fsr = &vcpu_cp15(vcpu, c5_DFSR);
104 }
105
106 prepare_fault32(vcpu, COMPAT_PSR_MODE_ABT | COMPAT_PSR_A_BIT, vect_offset);
107
108 *far = addr;
109
110 /* Give the guest an IMPLEMENTATION DEFINED exception */
111 is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
112 if (is_lpae)
113 *fsr = 1 << 9 | 0x34;
114 else
115 *fsr = 0x14;
116}
117
118enum exception_type { 36enum exception_type {
119 except_type_sync = 0, 37 except_type_sync = 0,
120 except_type_irq = 0x80, 38 except_type_irq = 0x80,
@@ -211,7 +129,7 @@ static void inject_undef64(struct kvm_vcpu *vcpu)
211void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr) 129void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
212{ 130{
213 if (!(vcpu->arch.hcr_el2 & HCR_RW)) 131 if (!(vcpu->arch.hcr_el2 & HCR_RW))
214 inject_abt32(vcpu, false, addr); 132 kvm_inject_dabt32(vcpu, addr);
215 else 133 else
216 inject_abt64(vcpu, false, addr); 134 inject_abt64(vcpu, false, addr);
217} 135}
@@ -227,7 +145,7 @@ void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
227void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr) 145void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
228{ 146{
229 if (!(vcpu->arch.hcr_el2 & HCR_RW)) 147 if (!(vcpu->arch.hcr_el2 & HCR_RW))
230 inject_abt32(vcpu, true, addr); 148 kvm_inject_pabt32(vcpu, addr);
231 else 149 else
232 inject_abt64(vcpu, true, addr); 150 inject_abt64(vcpu, true, addr);
233} 151}
@@ -241,7 +159,7 @@ void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
241void kvm_inject_undefined(struct kvm_vcpu *vcpu) 159void kvm_inject_undefined(struct kvm_vcpu *vcpu)
242{ 160{
243 if (!(vcpu->arch.hcr_el2 & HCR_RW)) 161 if (!(vcpu->arch.hcr_el2 & HCR_RW))
244 inject_undef32(vcpu); 162 kvm_inject_undef32(vcpu);
245 else 163 else
246 inject_undef64(vcpu); 164 inject_undef64(vcpu);
247} 165}