1 // SPDX-License-Identifier: GPL-2.0-or-later
49 	acpi_mp_wake_mailbox->apic_id = apicid;  in acpi_mp_cpu_die()
50 	smp_store_release(&acpi_mp_wake_mailbox->command,  in acpi_mp_cpu_die()
55 	while (READ_ONCE(acpi_mp_wake_mailbox->command) && --timeout)  in acpi_mp_cpu_die()
86 		return -ENOMEM;  in acpi_mp_setup_reset()
93 			return -ENOMEM;  in acpi_mp_setup_reset()
101 		return -ENOMEM;  in acpi_mp_setup_reset()
111 	info.offset = __START_KERNEL_map - phys_base;  in acpi_mp_setup_reset()
116 		return -ENOMEM;  in acpi_mp_setup_reset()
133 		return -EOPNOTSUPP;  in acpi_wakeup_cpu()
157 	acpi_mp_wake_mailbox->apic_id	    = apicid;  in acpi_wakeup_cpu()
158 	acpi_mp_wake_mailbox->wakeup_vector = start_ip;  in acpi_wakeup_cpu()
159 	smp_store_release(&acpi_mp_wake_mailbox->command,  in acpi_wakeup_cpu()
163 	 * Wait for the CPU to wake up.  in acpi_wakeup_cpu()
165 	 * The CPU being woken up is essentially in a spin loop waiting to be  in acpi_wakeup_cpu()
166 	 * woken up. It should not take long for it wake up and acknowledge by  in acpi_wakeup_cpu()
167 	 * zeroing out ->command.  in acpi_wakeup_cpu()
170 	 * has to wait for a wake up acknowledgment. It also doesn't provide  in acpi_wakeup_cpu()
171 	 * a way to cancel a wake up request if it takes too long.  in acpi_wakeup_cpu()
174 	 * wake up secondary. It can postpone scheduling secondary vCPU  in acpi_wakeup_cpu()
175 	 * indefinitely. Giving up on wake up request and reporting error opens  in acpi_wakeup_cpu()
176 	 * possible attack vector for VMM: it can wake up a secondary CPU when  in acpi_wakeup_cpu()
177 	 * kernel doesn't expect it. Wait until positive result of the wake up  in acpi_wakeup_cpu()
180 	while (READ_ONCE(acpi_mp_wake_mailbox->command))  in acpi_wakeup_cpu()
199 	 * already and acpi_wakeup_cpu() uses the cached value to bring up the  in acpi_mp_disable_offlining()
205 	mp_wake->mailbox_address = 0;  in acpi_mp_disable_offlining()
222 		return -EINVAL;  in acpi_parse_mp_wake()
223 	if (end - (unsigned long)mp_wake < ACPI_MADT_MP_WAKEUP_SIZE_V0)  in acpi_parse_mp_wake()
224 		return -EINVAL;  in acpi_parse_mp_wake()
225 	if (mp_wake->header.length < ACPI_MADT_MP_WAKEUP_SIZE_V0)  in acpi_parse_mp_wake()
226 		return -EINVAL;  in acpi_parse_mp_wake()
228 	acpi_table_print_madt_entry(&header->common);  in acpi_parse_mp_wake()
230 	acpi_mp_wake_mailbox_paddr = mp_wake->mailbox_address;  in acpi_parse_mp_wake()
232 	if (mp_wake->version >= ACPI_MADT_MP_WAKEUP_VERSION_V1 &&  in acpi_parse_mp_wake()
233 	    mp_wake->header.length >= ACPI_MADT_MP_WAKEUP_SIZE_V1) {  in acpi_parse_mp_wake()
234 		if (acpi_mp_setup_reset(mp_wake->reset_vector)) {  in acpi_parse_mp_wake()