arm: KVM: Add Virtual Abort injection helper

Now that we're able to context switch the HCR.VA bit, let's
introduce a helper that injects an Abort into a vcpu.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

arch/arm/include/asm/kvm_emulate.h

@@ -43,6 +43,7 @@ static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, u8 reg_num,
 bool kvm_condition_valid32(const struct kvm_vcpu *vcpu);
 void kvm_skip_instr32(struct kvm_vcpu *vcpu, bool is_wide_instr);
 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
+void kvm_inject_vabt(struct kvm_vcpu *vcpu);
 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
 

arch/arm/kvm/emulate.c

@@ -303,3 +303,15 @@ void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
 {
 	inject_abt(vcpu, true, addr);
 }
+
+/**
+ * kvm_inject_vabt - inject an async abort / SError into the guest
+ * @vcpu: The VCPU to receive the exception
+ *
+ * It is assumed that this code is called from the VCPU thread and that the
+ * VCPU therefore is not currently executing guest code.
+ */
+void kvm_inject_vabt(struct kvm_vcpu *vcpu)
+{
+	vcpu_set_hcr(vcpu, vcpu_get_hcr(vcpu) | HCR_VA);
+}