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| 1 | +// SPDX-License-Identifier: GPL-2.0-only |
| 2 | +/* |
| 3 | + * Copyright (c) 2024, Microsoft Corporation. |
| 4 | + * |
| 5 | + * This file contains functions that will be called from one or more modules. |
| 6 | + * If any of these modules are configured to build, this file is built and just |
| 7 | + * statically linked in. |
| 8 | + * |
| 9 | + * Authors: Microsoft Linux virtualization team |
| 10 | + */ |
| 11 | + |
| 12 | +#include <linux/kernel.h> |
| 13 | +#include <linux/mm.h> |
| 14 | +#include <asm/mshyperv.h> |
| 15 | +#include <linux/resume_user_mode.h> |
| 16 | + |
| 17 | +#include "mshv.h" |
| 18 | + |
| 19 | +#define HV_GET_REGISTER_BATCH_SIZE \ |
| 20 | + (HV_HYP_PAGE_SIZE / sizeof(union hv_register_value)) |
| 21 | +#define HV_SET_REGISTER_BATCH_SIZE \ |
| 22 | + ((HV_HYP_PAGE_SIZE - sizeof(struct hv_input_set_vp_registers)) \ |
| 23 | + / sizeof(struct hv_register_assoc)) |
| 24 | + |
| 25 | +int hv_call_get_vp_registers(u32 vp_index, u64 partition_id, u16 count, |
| 26 | + union hv_input_vtl input_vtl, |
| 27 | + struct hv_register_assoc *registers) |
| 28 | +{ |
| 29 | + struct hv_input_get_vp_registers *input_page; |
| 30 | + union hv_register_value *output_page; |
| 31 | + u16 completed = 0; |
| 32 | + unsigned long remaining = count; |
| 33 | + int rep_count, i; |
| 34 | + u64 status = HV_STATUS_SUCCESS; |
| 35 | + unsigned long flags; |
| 36 | + |
| 37 | + local_irq_save(flags); |
| 38 | + |
| 39 | + input_page = *this_cpu_ptr(hyperv_pcpu_input_arg); |
| 40 | + output_page = *this_cpu_ptr(hyperv_pcpu_output_arg); |
| 41 | + |
| 42 | + input_page->partition_id = partition_id; |
| 43 | + input_page->vp_index = vp_index; |
| 44 | + input_page->input_vtl.as_uint8 = input_vtl.as_uint8; |
| 45 | + input_page->rsvd_z8 = 0; |
| 46 | + input_page->rsvd_z16 = 0; |
| 47 | + |
| 48 | + while (remaining) { |
| 49 | + rep_count = min(remaining, HV_GET_REGISTER_BATCH_SIZE); |
| 50 | + for (i = 0; i < rep_count; ++i) |
| 51 | + input_page->names[i] = registers[i].name; |
| 52 | + |
| 53 | + status = hv_do_rep_hypercall(HVCALL_GET_VP_REGISTERS, rep_count, |
| 54 | + 0, input_page, output_page); |
| 55 | + if (!hv_result_success(status)) |
| 56 | + break; |
| 57 | + |
| 58 | + completed = hv_repcomp(status); |
| 59 | + for (i = 0; i < completed; ++i) |
| 60 | + registers[i].value = output_page[i]; |
| 61 | + |
| 62 | + registers += completed; |
| 63 | + remaining -= completed; |
| 64 | + } |
| 65 | + local_irq_restore(flags); |
| 66 | + |
| 67 | + return hv_result_to_errno(status); |
| 68 | +} |
| 69 | +EXPORT_SYMBOL_GPL(hv_call_get_vp_registers); |
| 70 | + |
| 71 | +int hv_call_set_vp_registers(u32 vp_index, u64 partition_id, u16 count, |
| 72 | + union hv_input_vtl input_vtl, |
| 73 | + struct hv_register_assoc *registers) |
| 74 | +{ |
| 75 | + struct hv_input_set_vp_registers *input_page; |
| 76 | + u16 completed = 0; |
| 77 | + unsigned long remaining = count; |
| 78 | + int rep_count; |
| 79 | + u64 status = HV_STATUS_SUCCESS; |
| 80 | + unsigned long flags; |
| 81 | + |
| 82 | + local_irq_save(flags); |
| 83 | + input_page = *this_cpu_ptr(hyperv_pcpu_input_arg); |
| 84 | + |
| 85 | + input_page->partition_id = partition_id; |
| 86 | + input_page->vp_index = vp_index; |
| 87 | + input_page->input_vtl.as_uint8 = input_vtl.as_uint8; |
| 88 | + input_page->rsvd_z8 = 0; |
| 89 | + input_page->rsvd_z16 = 0; |
| 90 | + |
| 91 | + while (remaining) { |
| 92 | + rep_count = min(remaining, HV_SET_REGISTER_BATCH_SIZE); |
| 93 | + memcpy(input_page->elements, registers, |
| 94 | + sizeof(struct hv_register_assoc) * rep_count); |
| 95 | + |
| 96 | + status = hv_do_rep_hypercall(HVCALL_SET_VP_REGISTERS, rep_count, |
| 97 | + 0, input_page, NULL); |
| 98 | + if (!hv_result_success(status)) |
| 99 | + break; |
| 100 | + |
| 101 | + completed = hv_repcomp(status); |
| 102 | + registers += completed; |
| 103 | + remaining -= completed; |
| 104 | + } |
| 105 | + |
| 106 | + local_irq_restore(flags); |
| 107 | + |
| 108 | + return hv_result_to_errno(status); |
| 109 | +} |
| 110 | +EXPORT_SYMBOL_GPL(hv_call_set_vp_registers); |
| 111 | + |
| 112 | +int hv_call_get_partition_property(u64 partition_id, |
| 113 | + u64 property_code, |
| 114 | + u64 *property_value) |
| 115 | +{ |
| 116 | + u64 status; |
| 117 | + unsigned long flags; |
| 118 | + struct hv_input_get_partition_property *input; |
| 119 | + struct hv_output_get_partition_property *output; |
| 120 | + |
| 121 | + local_irq_save(flags); |
| 122 | + input = *this_cpu_ptr(hyperv_pcpu_input_arg); |
| 123 | + output = *this_cpu_ptr(hyperv_pcpu_output_arg); |
| 124 | + memset(input, 0, sizeof(*input)); |
| 125 | + input->partition_id = partition_id; |
| 126 | + input->property_code = property_code; |
| 127 | + status = hv_do_hypercall(HVCALL_GET_PARTITION_PROPERTY, input, output); |
| 128 | + |
| 129 | + if (!hv_result_success(status)) { |
| 130 | + local_irq_restore(flags); |
| 131 | + return hv_result_to_errno(status); |
| 132 | + } |
| 133 | + *property_value = output->property_value; |
| 134 | + |
| 135 | + local_irq_restore(flags); |
| 136 | + |
| 137 | + return 0; |
| 138 | +} |
| 139 | +EXPORT_SYMBOL_GPL(hv_call_get_partition_property); |
| 140 | + |
| 141 | +/* |
| 142 | + * Handle any pre-processing before going into the guest mode on this cpu, most |
| 143 | + * notably call schedule(). Must be invoked with both preemption and |
| 144 | + * interrupts enabled. |
| 145 | + * |
| 146 | + * Returns: 0 on success, -errno on error. |
| 147 | + */ |
| 148 | +int mshv_do_pre_guest_mode_work(ulong th_flags) |
| 149 | +{ |
| 150 | + if (th_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) |
| 151 | + return -EINTR; |
| 152 | + |
| 153 | + if (th_flags & _TIF_NEED_RESCHED) |
| 154 | + schedule(); |
| 155 | + |
| 156 | + if (th_flags & _TIF_NOTIFY_RESUME) |
| 157 | + resume_user_mode_work(NULL); |
| 158 | + |
| 159 | + return 0; |
| 160 | +} |
| 161 | +EXPORT_SYMBOL_GPL(mshv_do_pre_guest_mode_work); |
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