1 // SPDX-License-Identifier: GPL-2.0
4 * Hyper-V nested virtualization code.
6 * Copyright (C) 2018, Microsoft, Inc.
8 * Author : Lan Tianyu <Tianyu.Lan@microsoft.com>
10 #define pr_fmt(fmt) "Hyper-V: " fmt
13 #include <linux/types.h>
14 #include <asm/hyperv-tlfs.h>
15 #include <asm/mshyperv.h>
16 #include <asm/tlbflush.h>
18 #include <asm/trace/hyperv.h>
20 int hyperv_flush_guest_mapping(u64 as)
22 struct hv_guest_mapping_flush *flush;
30 local_irq_save(flags);
32 flush = *this_cpu_ptr(hyperv_pcpu_input_arg);
34 if (unlikely(!flush)) {
35 local_irq_restore(flags);
39 flush->address_space = as;
42 status = hv_do_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE,
44 local_irq_restore(flags);
46 if (hv_result_success(status))
50 trace_hyperv_nested_flush_guest_mapping(as, ret);
53 EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping);
55 int hyperv_fill_flush_guest_mapping_list(
56 struct hv_guest_mapping_flush_list *flush,
57 u64 start_gfn, u64 pages)
65 * If flush requests exceed max flush count, go back to
66 * flush tlbs without range.
68 if (gpa_n >= HV_MAX_FLUSH_REP_COUNT)
71 additional_pages = min_t(u64, pages, HV_MAX_FLUSH_PAGES) - 1;
73 flush->gpa_list[gpa_n].page.additional_pages = additional_pages;
74 flush->gpa_list[gpa_n].page.largepage = false;
75 flush->gpa_list[gpa_n].page.basepfn = cur;
77 pages -= additional_pages + 1;
78 cur += additional_pages + 1;
84 EXPORT_SYMBOL_GPL(hyperv_fill_flush_guest_mapping_list);
86 int hyperv_flush_guest_mapping_range(u64 as,
87 hyperv_fill_flush_list_func fill_flush_list_func, void *data)
89 struct hv_guest_mapping_flush_list *flush;
95 if (!hv_hypercall_pg || !fill_flush_list_func)
98 local_irq_save(flags);
100 flush = *this_cpu_ptr(hyperv_pcpu_input_arg);
102 if (unlikely(!flush)) {
103 local_irq_restore(flags);
107 flush->address_space = as;
110 gpa_n = fill_flush_list_func(flush, data);
112 local_irq_restore(flags);
116 status = hv_do_rep_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST,
117 gpa_n, 0, flush, NULL);
119 local_irq_restore(flags);
121 if (hv_result_success(status))
124 ret = hv_result(status);
126 trace_hyperv_nested_flush_guest_mapping_range(as, ret);
129 EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping_range);