/* 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 <asm/ptrace.h>#include <asm/hyperv-tlfs.h> struct ms_hyperv_info {	u32 features;	u32 misc_features;	u32 hints;	u32 nested_features;	u32 max_vp_index;	u32 max_lp_index;};extern struct ms_hyperv_info ms_hyperv; extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);  /* Generate the guest OS identifier as described in the Hyper-V TLFS */static inline  __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,				       __u64 d_info2){	__u64 guest_id = 0; 	guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);	guest_id |= (d_info1 << 48);	guest_id |= (kernel_version << 16);	guest_id |= d_info2; 	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_signal_eom();	}} void hv_setup_vmbus_irq(void (*handler)(void));void hv_remove_vmbus_irq(void);void hv_enable_vmbus_irq(void);void hv_disable_vmbus_irq(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); #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; /* Sentinel value for an uninitialized entry in hv_vp_index array */#define VP_INVAL	U32_MAX /** * 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){	int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1; 	/* valid_bank_mask can represent up to 64 banks */	if (hv_max_vp_index / 64 >= 64)		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 <= hv_max_vp_index / 64; vcpu_bank++)		vpset->bank_contents[vcpu_bank] = 0; 	/*	 * Some banks may end up being empty but this is acceptable.	 */	for_each_cpu(cpu, cpus) {		vcpu = hv_cpu_number_to_vp_number(cpu);		if (vcpu == VP_INVAL)			return -1;		vcpu_bank = vcpu / 64;		vcpu_offset = vcpu % 64;		__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;} void hyperv_report_panic(struct pt_regs *regs, long err);void hyperv_report_panic_msg(phys_addr_t pa, size_t size);bool hv_is_hyperv_initialized(void);bool hv_is_hibernation_supported(void);void hyperv_cleanup(void);void hv_setup_sched_clock(void *sched_clock);#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) {}#endif /* CONFIG_HYPERV */ #if IS_ENABLED(CONFIG_HYPERV)extern int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void));extern void hv_remove_stimer0_irq(int irq);#endif #endif