ARM: KVM: abstract exception class decoding away

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

3 files changed, 8 insertions, 3 deletions

diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index a9b853f35aed..539f83ac167f 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -142,4 +142,9 @@ static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
         return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
 }
 
+static inline u8 kvm_vcpu_trap_get_class(struct kvm_vcpu *vcpu)
+{
+        return kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
+}
+
 #endif /* __ARM_KVM_EMULATE_H__ */
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 31616336255c..269900174102 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -559,7 +559,7 @@ static bool kvm_condition_valid(struct kvm_vcpu *vcpu)
          * catch undefined instructions, and then we won't get past
          * the arm_exit_handlers test anyway.
          */
-        BUG_ON(((kvm_vcpu_get_hsr(vcpu) & HSR_EC) >> HSR_EC_SHIFT) == 0);
+        BUG_ON(!kvm_vcpu_trap_get_class(vcpu));
 
         /* Top two bits non-zero?  Unconditional. */
         if (kvm_vcpu_get_hsr(vcpu) >> 30)
@@ -609,7 +609,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
         case ARM_EXCEPTION_DATA_ABORT:
         case ARM_EXCEPTION_PREF_ABORT:
         case ARM_EXCEPTION_HVC:
-                hsr_ec = (kvm_vcpu_get_hsr(vcpu) & HSR_EC) >> HSR_EC_SHIFT;
+                hsr_ec = kvm_vcpu_trap_get_class(vcpu);
 
                 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers)
                     || !arm_exit_handlers[hsr_ec]) {
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index d0f5f52c179f..41fa75df107f 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -593,7 +593,7 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run)
         gfn_t gfn;
         int ret, idx;
 
-        hsr_ec = kvm_vcpu_get_hsr(vcpu) >> HSR_EC_SHIFT;
+        hsr_ec = kvm_vcpu_trap_get_class(vcpu);
         is_iabt = (hsr_ec == HSR_EC_IABT);
         fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);