/* SPDX-License-Identifier: GPL-2.0 */ /* * Linux-specific definitions for managing interactions with Microsoft's * Hyper-V hypervisor. The definitions in this file are architecture * independent. See arch/<arch>/include/asm/mshyperv.h for definitions * that are specific to architecture <arch>. * * Definitions that are specified in the Hyper-V Top Level Functional * Spec (TLFS) should not go in this file, but should instead go in * hyperv-tlfs.h. * * Copyright (C) 2019, Microsoft, Inc. * * Author : Michael Kelley <mikelley@microsoft.com> */ #ifndef _ASM_GENERIC_MSHYPERV_H#define _ASM_GENERIC_MSHYPERV_H #include <linux/types.h>#include <linux/atomic.h>#include <linux/bitops.h>#include <linux/cpumask.h>#include <linux/nmi.h>#include <asm/ptrace.h>#include <asm/hyperv-tlfs.h> struct ms_hyperv_info {	u32 features;	u32 priv_high;	u32 misc_features;	u32 hints;	u32 nested_features;	u32 max_vp_index;	u32 max_lp_index;	u32 isolation_config_a;	union {		u32 isolation_config_b;		struct {			u32 cvm_type : 4;			u32 reserved1 : 1;			u32 shared_gpa_boundary_active : 1;			u32 shared_gpa_boundary_bits : 6;			u32 reserved2 : 20;		};	};	u64 shared_gpa_boundary;};extern struct ms_hyperv_info ms_hyperv;extern bool hv_nested; extern void * __percpu *hyperv_pcpu_input_arg;extern void * __percpu *hyperv_pcpu_output_arg; extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);extern bool hv_isolation_type_snp(void); /* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */static inline int hv_result(u64 status){	return status & HV_HYPERCALL_RESULT_MASK;} static inline bool hv_result_success(u64 status){	return hv_result(status) == HV_STATUS_SUCCESS;} static inline unsigned int hv_repcomp(u64 status){	/* Bits [43:32] of status have 'Reps completed' data. */	return (status & HV_HYPERCALL_REP_COMP_MASK) >>			 HV_HYPERCALL_REP_COMP_OFFSET;} /* * Rep hypercalls. Callers of this functions are supposed to ensure that * rep_count and varhead_size comply with Hyper-V hypercall definition. */static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,				      void *input, void *output){	u64 control = code;	u64 status;	u16 rep_comp; 	control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;	control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET; 	do {		status = hv_do_hypercall(control, input, output);		if (!hv_result_success(status))			return status; 		rep_comp = hv_repcomp(status); 		control &= ~HV_HYPERCALL_REP_START_MASK;		control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET; 		touch_nmi_watchdog();	} while (rep_comp < rep_count); 	return status;} /* Generate the guest OS identifier as described in the Hyper-V TLFS */static inline u64 hv_generate_guest_id(u64 kernel_version){	u64 guest_id; 	guest_id = (((u64)HV_LINUX_VENDOR_ID) << 48);	guest_id |= (kernel_version << 16); 	return guest_id;} /* Free the message slot and signal end-of-message if required */static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type){	/*	 * On crash we're reading some other CPU's message page and we need	 * to be careful: this other CPU may already had cleared the header	 * and the host may already had delivered some other message there.	 * In case we blindly write msg->header.message_type we're going	 * to lose it. We can still lose a message of the same type but	 * we count on the fact that there can only be one	 * CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages	 * on crash.	 */	if (cmpxchg(&msg->header.message_type, old_msg_type,		    HVMSG_NONE) != old_msg_type)		return; 	/*	 * The cmxchg() above does an implicit memory barrier to	 * ensure the write to MessageType (ie set to	 * HVMSG_NONE) happens before we read the	 * MessagePending and EOMing. Otherwise, the EOMing	 * will not deliver any more messages since there is	 * no empty slot	 */	if (msg->header.message_flags.msg_pending) {		/*		 * This will cause message queue rescan to		 * possibly deliver another msg from the		 * hypervisor		 */		hv_set_register(HV_REGISTER_EOM, 0);	}} void hv_setup_vmbus_handler(void (*handler)(void));void hv_remove_vmbus_handler(void);void hv_setup_stimer0_handler(void (*handler)(void));void hv_remove_stimer0_handler(void); void hv_setup_kexec_handler(void (*handler)(void));void hv_remove_kexec_handler(void);void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));void hv_remove_crash_handler(void); extern int vmbus_interrupt;extern int vmbus_irq; extern bool hv_root_partition; #if IS_ENABLED(CONFIG_HYPERV)/* * Hypervisor's notion of virtual processor ID is different from * Linux' notion of CPU ID. This information can only be retrieved * in the context of the calling CPU. Setup a map for easy access * to this information. */extern u32 *hv_vp_index;extern u32 hv_max_vp_index; extern u64 (*hv_read_reference_counter)(void); /* Sentinel value for an uninitialized entry in hv_vp_index array */#define VP_INVAL	U32_MAX int __init hv_common_init(void);void __init hv_common_free(void);int hv_common_cpu_init(unsigned int cpu);int hv_common_cpu_die(unsigned int cpu); void *hv_alloc_hyperv_page(void);void *hv_alloc_hyperv_zeroed_page(void);void hv_free_hyperv_page(unsigned long addr); /** * hv_cpu_number_to_vp_number() - Map CPU to VP. * @cpu_number: CPU number in Linux terms * * This function returns the mapping between the Linux processor * number and the hypervisor's virtual processor number, useful * in making hypercalls and such that talk about specific * processors. * * Return: Virtual processor number in Hyper-V terms */static inline int hv_cpu_number_to_vp_number(int cpu_number){	return hv_vp_index[cpu_number];} static inline int __cpumask_to_vpset(struct hv_vpset *vpset,				    const struct cpumask *cpus,				    bool exclude_self){	int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1;	int this_cpu = smp_processor_id();	int max_vcpu_bank = hv_max_vp_index / HV_VCPUS_PER_SPARSE_BANK; 	/* vpset.valid_bank_mask can represent up to HV_MAX_SPARSE_VCPU_BANKS banks */	if (max_vcpu_bank >= HV_MAX_SPARSE_VCPU_BANKS)		return 0; 	/*	 * Clear all banks up to the maximum possible bank as hv_tlb_flush_ex	 * structs are not cleared between calls, we risk flushing unneeded	 * vCPUs otherwise.	 */	for (vcpu_bank = 0; vcpu_bank <= max_vcpu_bank; vcpu_bank++)		vpset->bank_contents[vcpu_bank] = 0; 	/*	 * Some banks may end up being empty but this is acceptable.	 */	for_each_cpu(cpu, cpus) {		if (exclude_self && cpu == this_cpu)			continue;		vcpu = hv_cpu_number_to_vp_number(cpu);		if (vcpu == VP_INVAL)			return -1;		vcpu_bank = vcpu / HV_VCPUS_PER_SPARSE_BANK;		vcpu_offset = vcpu % HV_VCPUS_PER_SPARSE_BANK;		__set_bit(vcpu_offset, (unsigned long *)			  &vpset->bank_contents[vcpu_bank]);		if (vcpu_bank >= nr_bank)			nr_bank = vcpu_bank + 1;	}	vpset->valid_bank_mask = GENMASK_ULL(nr_bank - 1, 0);	return nr_bank;} static inline int cpumask_to_vpset(struct hv_vpset *vpset,				    const struct cpumask *cpus){	return __cpumask_to_vpset(vpset, cpus, false);} static inline int cpumask_to_vpset_noself(struct hv_vpset *vpset,				    const struct cpumask *cpus){	WARN_ON_ONCE(preemptible());	return __cpumask_to_vpset(vpset, cpus, true);} void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);bool hv_is_hyperv_initialized(void);bool hv_is_hibernation_supported(void);enum hv_isolation_type hv_get_isolation_type(void);bool hv_is_isolation_supported(void);bool hv_isolation_type_snp(void);u64 hv_ghcb_hypercall(u64 control, void *input, void *output, u32 input_size);void hyperv_cleanup(void);bool hv_query_ext_cap(u64 cap_query);void hv_setup_dma_ops(struct device *dev, bool coherent);void *hv_map_memory(void *addr, unsigned long size);void hv_unmap_memory(void *addr);#else /* CONFIG_HYPERV */static inline bool hv_is_hyperv_initialized(void) { return false; }static inline bool hv_is_hibernation_supported(void) { return false; }static inline void hyperv_cleanup(void) {}static inline bool hv_is_isolation_supported(void) { return false; }static inline enum hv_isolation_type hv_get_isolation_type(void){	return HV_ISOLATION_TYPE_NONE;}#endif /* CONFIG_HYPERV */ #endif