ARM: KVM: abstract S1TW abort detection away

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

arch/arm/include/asm/kvm_arm.h

@@ -211,6 +211,7 @@
 
 #define HSR_HVC_IMM_MASK	((1UL << 16) - 1)
 
+#define HSR_DABT_S1PTW		(1U << 7)
 #define HSR_DABT_CM		(1U << 8)
 #define HSR_DABT_EA		(1U << 9)
 

arch/arm/include/asm/kvm_emulate.h

@@ -115,4 +115,9 @@ static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
 	return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_EA;
 }
 
+static inline bool kvm_vcpu_dabt_iss1tw(struct kvm_vcpu *vcpu)
+{
+	return kvm_vcpu_get_hsr(vcpu) & HSR_DABT_S1PTW;
+}
+
 #endif /* __ARM_KVM_EMULATE_H__ */

arch/arm/kvm/mmio.c

@@ -71,7 +71,7 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 		return 1;
 	}
 
-	if ((kvm_vcpu_get_hsr(vcpu) >> 7) & 1) {
+	if (kvm_vcpu_dabt_iss1tw(vcpu)) {
 		/* page table accesses IO mem: tell guest to fix its TTBR */
 		kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
 		return 1;