diff options
Diffstat (limited to 'virt/kvm/arm/aarch32.c')
| -rw-r--r-- | virt/kvm/arm/aarch32.c | 97 |
1 files changed, 92 insertions, 5 deletions
diff --git a/virt/kvm/arm/aarch32.c b/virt/kvm/arm/aarch32.c index 79c7c357804b..8bc479fa37e6 100644 --- a/virt/kvm/arm/aarch32.c +++ b/virt/kvm/arm/aarch32.c @@ -25,11 +25,6 @@ #include <asm/kvm_emulate.h> #include <asm/kvm_hyp.h> -#ifndef CONFIG_ARM64 -#define COMPAT_PSR_T_BIT PSR_T_BIT -#define COMPAT_PSR_IT_MASK PSR_IT_MASK -#endif - /* * stolen from arch/arm/kernel/opcodes.c * @@ -150,3 +145,95 @@ void __hyp_text kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr) *vcpu_pc(vcpu) += 4; kvm_adjust_itstate(vcpu); } + +/* + * Table taken from ARMv8 ARM DDI0487B-B, table G1-10. + */ +static const u8 return_offsets[8][2] = { + [0] = { 0, 0 }, /* Reset, unused */ + [1] = { 4, 2 }, /* Undefined */ + [2] = { 0, 0 }, /* SVC, unused */ + [3] = { 4, 4 }, /* Prefetch abort */ + [4] = { 8, 8 }, /* Data abort */ + [5] = { 0, 0 }, /* HVC, unused */ + [6] = { 4, 4 }, /* IRQ, unused */ + [7] = { 4, 4 }, /* FIQ, unused */ +}; + +static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset) +{ + unsigned long cpsr; + unsigned long new_spsr_value = *vcpu_cpsr(vcpu); + bool is_thumb = (new_spsr_value & COMPAT_PSR_T_BIT); + u32 return_offset = return_offsets[vect_offset >> 2][is_thumb]; + u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR); + + cpsr = mode | COMPAT_PSR_I_BIT; + + if (sctlr & (1 << 30)) + cpsr |= COMPAT_PSR_T_BIT; + if (sctlr & (1 << 25)) + cpsr |= COMPAT_PSR_E_BIT; + + *vcpu_cpsr(vcpu) = cpsr; + + /* Note: These now point to the banked copies */ + *vcpu_spsr(vcpu) = new_spsr_value; + *vcpu_reg32(vcpu, 14) = *vcpu_pc(vcpu) + return_offset; + + /* Branch to exception vector */ + if (sctlr & (1 << 13)) + vect_offset += 0xffff0000; + else /* always have security exceptions */ + vect_offset += vcpu_cp15(vcpu, c12_VBAR); + + *vcpu_pc(vcpu) = vect_offset; +} + +void kvm_inject_undef32(struct kvm_vcpu *vcpu) +{ + prepare_fault32(vcpu, COMPAT_PSR_MODE_UND, 4); +} + +/* + * Modelled after TakeDataAbortException() and TakePrefetchAbortException + * pseudocode. + */ +static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt, + unsigned long addr) +{ + u32 vect_offset; + u32 *far, *fsr; + bool is_lpae; + + if (is_pabt) { + vect_offset = 12; + far = &vcpu_cp15(vcpu, c6_IFAR); + fsr = &vcpu_cp15(vcpu, c5_IFSR); + } else { /* !iabt */ + vect_offset = 16; + far = &vcpu_cp15(vcpu, c6_DFAR); + fsr = &vcpu_cp15(vcpu, c5_DFSR); + } + + prepare_fault32(vcpu, COMPAT_PSR_MODE_ABT | COMPAT_PSR_A_BIT, vect_offset); + + *far = addr; + + /* Give the guest an IMPLEMENTATION DEFINED exception */ + is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31); + if (is_lpae) + *fsr = 1 << 9 | 0x34; + else + *fsr = 0x14; +} + +void kvm_inject_dabt32(struct kvm_vcpu *vcpu, unsigned long addr) +{ + inject_abt32(vcpu, false, addr); +} + +void kvm_inject_pabt32(struct kvm_vcpu *vcpu, unsigned long addr) +{ + inject_abt32(vcpu, true, addr); +} |