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()
132 		pr_warn_once("No MADT mailbox: cannot bringup secondary CPUs. Booting with kexec?\n");  in acpi_wakeup_cpu()
133 		return -EOPNOTSUPP;  in acpi_wakeup_cpu()
139 	 * Wakeup of secondary CPUs is fully serialized in the core code.  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()
167 	 * zeroing out ->command.  in acpi_wakeup_cpu()
174 	 * wake up secondary. It can postpone scheduling secondary vCPU  in acpi_wakeup_cpu()
176 	 * possible attack vector for VMM: it can wake up a secondary CPU when  in acpi_wakeup_cpu()
180 	while (READ_ONCE(acpi_mp_wake_mailbox->command))  in acpi_wakeup_cpu()
194 	 * To prevent a kexec kernel from onlining secondary CPUs invalidate the  in acpi_mp_disable_offlining()
200 	 * secondary CPUs.  in acpi_mp_disable_offlining()
205 	mp_wake->mailbox_address = 0;  in acpi_mp_disable_offlining()
217 	 * entry.  'sizeof (struct acpi_madt_multiproc_wakeup)' can be larger  in acpi_parse_mp_wake()
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()