1 // SPDX-License-Identifier: GPL-2.0
5  * Hyper-V. This file is specifically for code that must be
6  * built-in to the kernel image when CONFIG_HYPERV is set
8  * specific code under arch/.
29 #include <linux/dma-map-ops.h>
42  * Hyper-V specific globals so they are shared across all architectures and are
72  * Per-cpu array holding the tail pointer for the SynIC event ring buffer
82  * Hyper-V specific initialization and shutdown code that is
84  * specific initialization functions.
111  * Boolean to control whether to report panic messages over Hyper-V.
119  * reported to Hyper-V on panic.
159 	/* Don't notify Hyper-V unless we have a die oops event or panic. */  in hv_die_panic_notify_crash()
168 		regs = ((struct die_args *)args)->regs;  in hv_die_panic_notify_crash()
172 	 * Hyper-V should be notified only once about a panic/die. If we will  in hv_die_panic_notify_crash()
184  * buffer and call into Hyper-V to transfer the data.
193 	if (detail->reason != KMSG_DUMP_PANIC || !sysctl_record_panic_msg)  in hv_kmsg_dump()
198 	 * be single-threaded.  in hv_kmsg_dump()
208 	 * registers are no-op when the NOTIFY_MSG flag is set.  in hv_kmsg_dump()
217 	 * Let Hyper-V know there is crash data available along with  in hv_kmsg_dump()
246 		pr_err("Hyper-V: panic message page memory allocation failed\n");  in hv_kmsg_dump_register()
252 		pr_err("Hyper-V: kmsg dump register error 0x%x\n", ret);  in hv_kmsg_dump_register()
265 	struct hv_output_get_partition_id *output;  in hv_get_partition_id()  local
270 	output = *this_cpu_ptr(hyperv_pcpu_input_arg);  in hv_get_partition_id()
271 	status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output);  in hv_get_partition_id()
272 	pt_id = output->partition_id;  in hv_get_partition_id()
278 		pr_err("Hyper-V: failed to get partition ID: %#x\n",  in hv_get_partition_id()
286 	struct hv_output_get_vp_registers *output;  in get_vtl()  local
292 	output = *this_cpu_ptr(hyperv_pcpu_output_arg);  in get_vtl()
295 	input->partition_id = HV_PARTITION_ID_SELF;  in get_vtl()
296 	input->vp_index = HV_VP_INDEX_SELF;  in get_vtl()
297 	input->input_vtl.as_uint8 = 0;  in get_vtl()
298 	input->names[0] = HV_REGISTER_VSM_VP_STATUS;  in get_vtl()
300 	ret = hv_do_hypercall(control, input, output);  in get_vtl()
302 		ret = output->values[0].reg8 & HV_VTL_MASK;  in get_vtl()
318 	/* Get information about the Hyper-V host version */  in hv_common_init()
320 		pr_info("Hyper-V: Host Build %d.%d.%d.%d-%d-%d\n",  in hv_common_init()
329 	 * Hyper-V expects to get crash register data or kmsg when  in hv_common_init()
339 		pr_info("Hyper-V: enabling crash_kexec_post_notifiers\n");  in hv_common_init()
343 		 * is enabled by default in non-isolated guests and  in hv_common_init()
350 			pr_err("Hyper-V: sysctl table register error");  in hv_common_init()
366 	 * Allocate the per-CPU state for the hypercall input arg.  in hv_common_init()
368 	 * (per-CPU) hypercall input page and thus this failure is  in hv_common_init()
369 	 * fatal on Hyper-V.  in hv_common_init()
374 	/* Allocate the per-CPU state for output arg for root */  in hv_common_init()
389 		return -ENOMEM;  in hv_common_init()
407 	 * the Hyper-V host in ACPI table OEM0.  in ms_hyperv_late_init()
417 	 * Since the "OEM0" table name is for OEM specific usage, verify  in ms_hyperv_late_init()
420 	if (strncmp(header->oem_table_id, "MICROSFT", 8))  in ms_hyperv_late_init()
426 	 * against a malformed table. Hyper-V currently provides 64 bytes,  in ms_hyperv_late_init()
429 	if (header->length < sizeof(*header) + 8 ||  in ms_hyperv_late_init()
430 	    header->length > sizeof(*header) + SZ_4K)  in ms_hyperv_late_init()
433 	length = header->length - sizeof(*header);  in ms_hyperv_late_init()
436 	pr_debug("Hyper-V: Seeding rng with %d random bytes from ACPI table OEM0\n",  in ms_hyperv_late_init()
450 		header->checksum += randomdata[i];  in ms_hyperv_late_init()
454 	for (i = 0; i < sizeof(header->length); i++)  in ms_hyperv_late_init()
455 		header->checksum += ((u8 *)&header->length)[i];  in ms_hyperv_late_init()
456 	header->length = sizeof(*header);  in ms_hyperv_late_init()
457 	for (i = 0; i < sizeof(header->length); i++)  in ms_hyperv_late_init()
458 		header->checksum -= ((u8 *)&header->length)[i];  in ms_hyperv_late_init()
465  * Hyper-V specific initialization and die code for
486 	 * The per-cpu memory is already allocated if this CPU was previously  in hv_common_cpu_init()
492 			return -ENOMEM;  in hv_common_cpu_init()
512 		 * hyperv_pcpu_input_arg is not NULL, set_memory_decrypted() ->  in hv_common_cpu_init()
513 		 * ... -> cpa_flush()-> ... -> __send_ipi_mask_ex() tries to  in hv_common_cpu_init()
540 			ret = -ENOMEM;  in hv_common_cpu_init()
552 	 * may be used by the Hyper-V vPCI driver in reassigning interrupts  in hv_common_cpu_die()
575 	 * output parameter to the hypercall below and so it should be  in hv_query_ext_cap()
580 	 * Hypercall input/output addresses should also be 8-byte aligned.  in hv_query_ext_cap()
607 		pr_err("Hyper-V: Extended query capabilities hypercall failed 0x%llx\n",  in hv_query_ext_cap()
629  * Default function to read the Hyper-V reference counter, independent
630  * of whether Hyper-V enlightened clocks/timers are being used. But on
631  * architectures where it is used, Hyper-V enlightenment code in
642 /* These __weak functions provide default "no-op" behavior and
643  * may be overridden by architecture specific versions. Architectures
644  * for which the default "no-op" behavior is sufficient can leave
646  * functions in arch-specific code.
707 u64 __weak hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size)  in hv_ghcb_hypercall()  argument
726 	 * Hyper-V should never specify running as root and as a Confidential  in hv_identify_partition_type()
727 	 * VM. But to protect against a compromised/malicious Hyper-V trying  in hv_identify_partition_type()
735 			pr_crit("Hyper-V: CONFIG_MSHV_ROOT not enabled!\n");  in hv_identify_partition_type()
737 			pr_info("Hyper-V: running as root partition\n");  in hv_identify_partition_type()
740 			pr_info("Hyper-V: running as L1VH partition\n");  in hv_identify_partition_type()
757  * Provide a few mappings that could be useful, and revert to -EIO
763 	_STATUS_INFO(HV_STATUS_INVALID_HYPERCALL_CODE,		-EINVAL),
764 	_STATUS_INFO(HV_STATUS_INVALID_HYPERCALL_INPUT,		-EINVAL),
765 	_STATUS_INFO(HV_STATUS_INVALID_ALIGNMENT,		-EIO),
766 	_STATUS_INFO(HV_STATUS_INVALID_PARAMETER,		-EINVAL),
767 	_STATUS_INFO(HV_STATUS_ACCESS_DENIED,			-EIO),
768 	_STATUS_INFO(HV_STATUS_INVALID_PARTITION_STATE,		-EIO),
769 	_STATUS_INFO(HV_STATUS_OPERATION_DENIED,		-EIO),
770 	_STATUS_INFO(HV_STATUS_UNKNOWN_PROPERTY,		-EIO),
771 	_STATUS_INFO(HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE,	-EIO),
772 	_STATUS_INFO(HV_STATUS_INSUFFICIENT_MEMORY,		-ENOMEM),
773 	_STATUS_INFO(HV_STATUS_INVALID_PARTITION_ID,		-EINVAL),
774 	_STATUS_INFO(HV_STATUS_INVALID_VP_INDEX,		-EINVAL),
775 	_STATUS_INFO(HV_STATUS_NOT_FOUND,			-EIO),
776 	_STATUS_INFO(HV_STATUS_INVALID_PORT_ID,			-EINVAL),
777 	_STATUS_INFO(HV_STATUS_INVALID_CONNECTION_ID,		-EINVAL),
778 	_STATUS_INFO(HV_STATUS_INSUFFICIENT_BUFFERS,		-EIO),
779 	_STATUS_INFO(HV_STATUS_NOT_ACKNOWLEDGED,		-EIO),
780 	_STATUS_INFO(HV_STATUS_INVALID_VP_STATE,		-EIO),
781 	_STATUS_INFO(HV_STATUS_NO_RESOURCES,			-EIO),
782 	_STATUS_INFO(HV_STATUS_PROCESSOR_FEATURE_NOT_SUPPORTED,	-EIO),
783 	_STATUS_INFO(HV_STATUS_INVALID_LP_INDEX,		-EINVAL),
784 	_STATUS_INFO(HV_STATUS_INVALID_REGISTER_VALUE,		-EINVAL),
785 	_STATUS_INFO(HV_STATUS_INVALID_LP_INDEX,		-EIO),
786 	_STATUS_INFO(HV_STATUS_INVALID_REGISTER_VALUE,		-EIO),
787 	_STATUS_INFO(HV_STATUS_OPERATION_FAILED,		-EIO),
788 	_STATUS_INFO(HV_STATUS_TIME_OUT,			-EIO),
789 	_STATUS_INFO(HV_STATUS_CALL_PENDING,			-EIO),
790 	_STATUS_INFO(HV_STATUS_VTL_ALREADY_ENABLED,		-EIO),
802 		if (info->code == code)  in find_hv_status_info()
809 /* Convert a hypercall result into a linux-friendly error code. */
816 		return -EOPNOTSUPP;  in hv_result_to_errno()
820 		return info->errno;  in hv_result_to_errno()
822 	return -EIO;  in hv_result_to_errno()
835 		return info->string;  in hv_result_to_string()