1 // SPDX-License-Identifier: GPL-2.0-only
3 /* hypercalls: Check the ARM64's psuedo-firmware bitmap register interface.
6  * via the psuedo-firmware bitmap register. This includes the registers'
7  * read/write behavior before and after the VM has started, and if the
12 #include <linux/arm-smccc.h>
27 	uint64_t max_feat_bit;	/* Bit that represents the upper limit of the feature-map */
102 		smccc_hvc(hc_info->func_id, hc_info->arg1, 0, 0, 0, 0, 0, 0, &res);  in guest_test_hvc()
109 					res.a0, hc_info->func_id, hc_info->arg1, stage);  in guest_test_hvc()
114 					res.a0, hc_info->func_id, hc_info->arg1, stage);  in guest_test_hvc()
160 	vm_userspace_mem_region_add(vcpu->vm, VM_MEM_SRC_ANONYMOUS, ST_GPA_BASE, 1, gpages, 0);  in steal_time_init()
176 		vcpu_get_reg(vcpu, reg_info->reg, &val);  in test_fw_regs_before_vm_start()
177 		TEST_ASSERT(val == FW_REG_ULIMIT_VAL(reg_info->max_feat_bit),  in test_fw_regs_before_vm_start()
179 			reg_info->reg, FW_REG_ULIMIT_VAL(reg_info->max_feat_bit), val);  in test_fw_regs_before_vm_start()
181 		/* Test a 'write' by disabling all the features of the register map */  in test_fw_regs_before_vm_start()
182 		ret = __vcpu_set_reg(vcpu, reg_info->reg, 0);  in test_fw_regs_before_vm_start()
185 			reg_info->reg, errno);  in test_fw_regs_before_vm_start()
187 		vcpu_get_reg(vcpu, reg_info->reg, &val);  in test_fw_regs_before_vm_start()
189 			"Expected all the features to be cleared for reg: 0x%lx\n", reg_info->reg);  in test_fw_regs_before_vm_start()
195 		if (reg_info->max_feat_bit < 63) {  in test_fw_regs_before_vm_start()
196 			ret = __vcpu_set_reg(vcpu, reg_info->reg, BIT(reg_info->max_feat_bit + 1));  in test_fw_regs_before_vm_start()
199 			errno, reg_info->reg);  in test_fw_regs_before_vm_start()
214 		 * Before starting the VM, the test clears all the bits.  in test_fw_regs_after_vm_start()
217 		vcpu_get_reg(vcpu, reg_info->reg, &val);  in test_fw_regs_after_vm_start()
220 			reg_info->reg);  in test_fw_regs_after_vm_start()
223 		 * Since the VM has run at least once, KVM shouldn't allow modification of  in test_fw_regs_after_vm_start()
227 		ret = __vcpu_set_reg(vcpu, reg_info->reg, FW_REG_ULIMIT_VAL(reg_info->max_feat_bit));  in test_fw_regs_after_vm_start()
229 …"Unexpected behavior or return value (%d) while setting a feature while VM is running for reg: 0x%…  in test_fw_regs_after_vm_start()
230 		errno, reg_info->reg);  in test_fw_regs_after_vm_start()
236 	struct kvm_vm *vm;  in test_vm_create()  local
238 	vm = vm_create_with_one_vcpu(vcpu, guest_code);  in test_vm_create()
242 	return vm;  in test_vm_create()
245 static void test_guest_stage(struct kvm_vm **vm, struct kvm_vcpu **vcpu)  in test_guest_stage()  argument
251 	/* Sync the stage early, the VM might be freed below. */  in test_guest_stage()
253 	sync_global_to_guest(*vm, stage);  in test_guest_stage()
260 		/* Start a new VM so that all the features are now enabled by default */  in test_guest_stage()
261 		kvm_vm_free(*vm);  in test_guest_stage()
262 		*vm = test_vm_create(vcpu);  in test_guest_stage()
275 	struct kvm_vm *vm;  in test_run()  local
279 	vm = test_vm_create(&vcpu);  in test_run()
288 			test_guest_stage(&vm, &vcpu);  in test_run()
301 	kvm_vm_free(vm);  in test_run()