ARM: KVM: abstract IL decoding away

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>

arch/arm/include/asm/kvm_emulate.h

@@ -136,4 +136,10 @@ static inline int kvm_vcpu_dabt_get_as(struct kvm_vcpu *vcpu)
 	}
 }
 
+/* This one is not specific to Data Abort */
+static inline bool kvm_vcpu_trap_il_is32bit(struct kvm_vcpu *vcpu)
+{
+	return kvm_vcpu_get_hsr(vcpu) & HSR_IL;
+}
+
 #endif /* __ARM_KVM_EMULATE_H__ */

arch/arm/kvm/arm.c

@@ -624,8 +624,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 		 * that fail their condition code check"
 		 */
 		if (!kvm_condition_valid(vcpu)) {
-			bool is_wide = kvm_vcpu_get_hsr(vcpu) & HSR_IL;
-			kvm_skip_instr(vcpu, is_wide);
+			kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
 			return 1;
 		}
 

arch/arm/kvm/coproc.c

@@ -293,7 +293,7 @@ static int emulate_cp15(struct kvm_vcpu *vcpu,
 
 		if (likely(r->access(vcpu, params, r))) {
 			/* Skip instruction, since it was emulated */
-			kvm_skip_instr(vcpu, (kvm_vcpu_get_hsr(vcpu) >> 25) & 1);
+			kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
 			return 1;
 		}
 		/* If access function fails, it should complain. */

arch/arm/kvm/mmio.c

@@ -101,7 +101,7 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	 * The MMIO instruction is emulated and should not be re-executed
 	 * in the guest.
 	 */
-	kvm_skip_instr(vcpu, (kvm_vcpu_get_hsr(vcpu) >> 25) & 1);
+	kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
 	return 0;
 }