/include/asm-generic/mshyperv.h
C Header | 285 lines | 173 code | 39 blank | 73 comment | 14 complexity | d26ef95aecc15714dbb32feb4b2c7ef7 MD5 | raw file
- /* 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 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 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_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();
- /* 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) {
- if (exclude_self && cpu == this_cpu)
- continue;
- 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;
- }
- 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_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