KVM: selftests: Add skip_set facility to get_reg_list test

Add new skips_set members to vcpu_reg_sublist so as to skip
set operation on some registers.

Suggested-by: Andrew Jones <[e-mail]>
Signed-off-by: Haibo Xu <[e-mail]>
Reviewed-by: Andrew Jones <[e-mail]>
Signed-off-by: Anup Patel <[e-mail]>

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

···
 {
 	int new_regs = 0, missing_regs = 0, i, n;
 	int failed_get = 0, failed_set = 0, failed_reject = 0;
+	int skipped_set = 0;
 	struct kvm_vcpu *vcpu;
 	struct kvm_vm *vm;
 	struct vcpu_reg_sublist *s;
···
 			.id = reg_list->reg[i],
 			.addr = (__u64)&addr,
 		};
-		bool reject_reg = false;
+		bool reject_reg = false, skip_reg = false;
 		int ret;
 
 		ret = __vcpu_get_reg(vcpu, reg_list->reg[i], &addr);
···
 			++failed_get;
 		}
 
-		/* rejects_set registers are rejected after KVM_ARM_VCPU_FINALIZE */
 		for_each_sublist(c, s) {
+			/* rejects_set registers are rejected for set operation */
 			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);
···
 				}
 				break;
 			}
+
+			/* skips_set registers are skipped for set operation */
+			if (s->skips_set && find_reg(s->skips_set, s->skips_set_n, reg.id)) {
+				skip_reg = true;
+				++skipped_set;
+				break;
+			}
 		}
 
-		if (!reject_reg) {
+		if (!reject_reg && !skip_reg) {
 			ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, &reg);
 			if (ret) {
 				printf("%s: Failed to set ", config_name(c));
···
 	}
 
 	TEST_ASSERT(!missing_regs && !failed_get && !failed_set && !failed_reject,
-		    "%s: There are %d missing registers; "
-		    "%d registers failed get; %d registers failed set; %d registers failed reject",
-		    config_name(c), missing_regs, failed_get, failed_set, failed_reject);
+		    "%s: There are %d missing registers; %d registers failed get; "
+		    "%d registers failed set; %d registers failed reject; %d registers skipped set",
+		    config_name(c), missing_regs, failed_get, failed_set, failed_reject, skipped_set);
 
 	pr_info("%s: PASS\n", config_name(c));
 	blessed_n = 0;

tools/testing/selftests/kvm/include/kvm_util_base.h

···
 	__u64 regs_n;
 	__u64 *rejects_set;
 	__u64 rejects_set_n;
+	__u64 *skips_set;
+	__u64 skips_set_n;
 };
 
 struct vcpu_reg_list {