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linux-headers-5.4.0-212
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asm-generic
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mshyperv.h
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/* 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, bool in_die); void hyperv_report_panic_msg(phys_addr_t pa, size_t size); bool hv_is_hyperv_initialized(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 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