KVM: arm64: selftests: Move reject_set check logic to a function

No functional changes. Just move the reject_set check logic to a
function so we can check for a specific errno. This is a preparation
for support reject_set in riscv.

Suggested-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Haibo Xu <haibo1.xu@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>

tools/testing/selftests/kvm/aarch64/get-reg-list.c

@@ -79,6 +79,11 @@ bool check_supported_reg(struct kvm_vcpu *vcpu, __u64 reg)
 	return check_supported_feat_reg(vcpu, reg);
 }
 
+bool check_reject_set(int err)
+{
+	return err == EPERM;
+}
+
 #define REG_MASK (KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_COPROC_MASK)
 
 #define CORE_REGS_XX_NR_WORDS	2

tools/testing/selftests/kvm/get-reg-list.c

@@ -104,6 +104,11 @@ void __weak print_reg(const char *prefix, __u64 id)
 	printf("\t0x%llx,\n", id);
 }
 
+bool __weak check_reject_set(int err)
+{
+	return true;
+}
+
 #ifdef __aarch64__
 static void prepare_vcpu_init(struct vcpu_reg_list *c, struct kvm_vcpu_init *init)
 {
@@ -222,7 +227,7 @@ static void run_test(struct vcpu_reg_list *c)
 			if (s->rejects_set && find_reg(s->rejects_set, s->rejects_set_n, reg.id)) {
 				reject_reg = true;
 				ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, &reg);
-				if (ret != -1 || errno != EPERM) {
+				if (ret != -1 || !check_reject_set(errno)) {
 					printf("%s: Failed to reject (ret=%d, errno=%d) ", config_name(c), ret, errno);
 					print_reg(config_name(c), reg.id);
 					putchar('\n');