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/* * 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 derived from Hyper-V code or headers should not go in * this file, but should instead go in the relevant files in include/hyperv. * * 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 <acpi/acpi_numa.h>#include <linux/cpumask.h>#include <linux/nmi.h>#include <asm/ptrace.h>#include <hyperv/hvhdk.h>
#define VTPM_BASE_ADDRESS 0xfed40000
enum hv_partition_type { HV_PARTITION_TYPE_GUEST, HV_PARTITION_TYPE_ROOT, HV_PARTITION_TYPE_L1VH,};
struct ms_hyperv_info { u32 features; u32 priv_high; u32 ext_features; u32 misc_features; u32 hints; u32 nested_features; u32 max_vp_index; u32 max_lp_index; u8 vtl; union { u32 isolation_config_a; struct { u32 paravisor_present : 1; u32 reserved_a1 : 31; }; }; union { u32 isolation_config_b; struct { u32 cvm_type : 4; u32 reserved_b1 : 1; u32 shared_gpa_boundary_active : 1; u32 shared_gpa_boundary_bits : 6; u32 reserved_b2 : 20; }; }; u64 shared_gpa_boundary; bool msi_ext_dest_id; bool confidential_vmbus_available;};extern struct ms_hyperv_info ms_hyperv;extern bool hv_nested;extern u64 hv_current_partition_id;extern enum hv_partition_type hv_curr_partition_type;
extern void * __percpu *hyperv_pcpu_input_arg;extern void * __percpu *hyperv_pcpu_output_arg;
u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);u64 hv_do_fast_hypercall8(u16 control, u64 input8);u64 hv_do_fast_hypercall16(u16 control, u64 input1, u64 input2);
bool hv_isolation_type_snp(void);bool hv_isolation_type_tdx(void);
/* * On architectures where Hyper-V doesn't support AEOI (e.g., ARM64), * it doesn't provide a recommendation flag and AEOI must be disabled. */static inline bool hv_recommend_using_aeoi(void){#ifdef HV_DEPRECATING_AEOI_RECOMMENDED return !(ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED);#else return false;#endif}
static inline struct hv_proximity_domain_info hv_numa_node_to_pxm_info(int node){ struct hv_proximity_domain_info pxm_info = {};
if (node != NUMA_NO_NODE) { pxm_info.domain_id = node_to_pxm(node); pxm_info.flags.proximity_info_valid = 1; pxm_info.flags.proximity_preferred = 1; }
return pxm_info;}
/* 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, varhead_size, and rep_start comply with Hyper-V hypercall * definition. */static inline u64 hv_do_rep_hypercall_ex(u16 code, u16 rep_count, u16 varhead_size, u16 rep_start, 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; control |= (u64)rep_start << HV_HYPERCALL_REP_START_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;}
/* For the typical case where rep_start is 0 */static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size, void *input, void *output){ return hv_do_rep_hypercall_ex(code, rep_count, varhead_size, 0, input, output);}
/* 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;}
int hv_get_hypervisor_version(union hv_hypervisor_version_info *info);
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);void hv_setup_mshv_handler(void (*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;
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_get_partition_id(void);void __init hv_common_free(void);void __init ms_hyperv_late_init(void);int hv_common_cpu_init(unsigned int cpu);int hv_common_cpu_die(unsigned int cpu);void hv_identify_partition_type(void);
/** * 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 (*func)(int cpu)){ int cpu, vcpu, vcpu_bank, vcpu_offset, nr_bank = 1; 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 (func && func(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;}
/* * Convert a Linux cpumask into a Hyper-V VPset. In the _skip variant, * 'func' is called for each CPU present in cpumask. If 'func' returns * true, that CPU is skipped -- i.e., that CPU from cpumask is *not* * added to the Hyper-V VPset. If 'func' is NULL, no CPUs are * skipped. */static inline int cpumask_to_vpset(struct hv_vpset *vpset, const struct cpumask *cpus){ return __cpumask_to_vpset(vpset, cpus, NULL);}
static inline int cpumask_to_vpset_skip(struct hv_vpset *vpset, const struct cpumask *cpus, bool (*func)(int cpu)){ return __cpumask_to_vpset(vpset, cpus, func);}
#define _hv_status_fmt(fmt) "%s: Hyper-V status: %#x = %s: " fmt#define hv_status_printk(level, status, fmt, ...) \do { \ u64 __status = (status); \ pr_##level(_hv_status_fmt(fmt), __func__, hv_result(__status), \ hv_result_to_string(__status), ##__VA_ARGS__); \} while (0)#define hv_status_err(status, fmt, ...) \ hv_status_printk(err, status, fmt, ##__VA_ARGS__)#define hv_status_debug(status, fmt, ...) \ hv_status_printk(debug, status, fmt, ##__VA_ARGS__)
const char *hv_result_to_string(u64 hv_status);int hv_result_to_errno(u64 status);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);u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);void hv_enable_coco_interrupt(unsigned int cpu, unsigned int vector, bool set);void hv_para_set_sint_proxy(bool enable);u64 hv_para_get_synic_register(unsigned int reg);void hv_para_set_synic_register(unsigned int reg, u64 val);void hyperv_cleanup(void);bool hv_query_ext_cap(u64 cap_query);void hv_setup_dma_ops(struct device *dev, bool coherent);#else /* CONFIG_HYPERV */static inline void hv_identify_partition_type(void) {}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 void ms_hyperv_late_init(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 */
#if IS_ENABLED(CONFIG_MSHV_ROOT)static inline bool hv_root_partition(void){ return hv_curr_partition_type == HV_PARTITION_TYPE_ROOT;}static inline bool hv_l1vh_partition(void){ return hv_curr_partition_type == HV_PARTITION_TYPE_L1VH;}static inline bool hv_parent_partition(void){ return hv_root_partition() || hv_l1vh_partition();}
bool hv_result_needs_memory(u64 status);int hv_deposit_memory_node(int node, u64 partition_id, u64 status);int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);int hv_call_notify_all_processors_started(void);bool hv_lp_exists(u32 lp_index);int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
#else /* CONFIG_MSHV_ROOT */static inline bool hv_root_partition(void) { return false; }static inline bool hv_l1vh_partition(void) { return false; }static inline bool hv_parent_partition(void) { return false; }static inline bool hv_result_needs_memory(u64 status) { return false; }static inline int hv_deposit_memory_node(int node, u64 partition_id, u64 status){ return -EOPNOTSUPP;}static inline int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages){ return -EOPNOTSUPP;}static inline int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id){ return -EOPNOTSUPP;}static inline int hv_call_notify_all_processors_started(void){ return -EOPNOTSUPP;}static inline bool hv_lp_exists(u32 lp_index){ return false;}static inline int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags){ return -EOPNOTSUPP;}#endif /* CONFIG_MSHV_ROOT */
static inline int hv_deposit_memory(u64 partition_id, u64 status){ return hv_deposit_memory_node(NUMA_NO_NODE, partition_id, status);}
#if IS_ENABLED(CONFIG_HYPERV_VTL_MODE)u8 __init get_vtl(void);#elsestatic inline u8 get_vtl(void) { return 0; }#endif
#endif