137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Hyper-V nested virtualization code.
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*
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* Copyright (C) 2018, Microsoft, Inc.
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*
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* Author : Lan Tianyu <Tianyu.Lan@microsoft.com>
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*/
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#define pr_fmt(fmt) "Hyper-V: " fmt
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#include <linux/types.h>
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#include <asm/hyperv-tlfs.h>
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#include <asm/mshyperv.h>
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#include <asm/tlbflush.h>
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#include <asm/trace/hyperv.h>
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int hyperv_flush_guest_mapping(u64 as)
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{
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struct hv_guest_mapping_flush **flush_pcpu;
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struct hv_guest_mapping_flush *flush;
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u64 status;
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unsigned long flags;
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int ret = -ENOTSUPP;
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if (!hv_hypercall_pg)
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goto fault;
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local_irq_save(flags);
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flush_pcpu = (struct hv_guest_mapping_flush **)
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this_cpu_ptr(hyperv_pcpu_input_arg);
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flush = *flush_pcpu;
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if (unlikely(!flush)) {
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local_irq_restore(flags);
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goto fault;
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}
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flush->address_space = as;
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flush->flags = 0;
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status = hv_do_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE,
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flush, NULL);
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local_irq_restore(flags);
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if (!(status & HV_HYPERCALL_RESULT_MASK))
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ret = 0;
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fault:
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trace_hyperv_nested_flush_guest_mapping(as, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping);
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int hyperv_fill_flush_guest_mapping_list(
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struct hv_guest_mapping_flush_list *flush,
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u64 start_gfn, u64 pages)
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{
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u64 cur = start_gfn;
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u64 additional_pages;
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int gpa_n = 0;
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do {
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/*
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* If flush requests exceed max flush count, go back to
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* flush tlbs without range.
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*/
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if (gpa_n >= HV_MAX_FLUSH_REP_COUNT)
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return -ENOSPC;
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additional_pages = min_t(u64, pages, HV_MAX_FLUSH_PAGES) - 1;
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flush->gpa_list[gpa_n].page.additional_pages = additional_pages;
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flush->gpa_list[gpa_n].page.largepage = false;
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flush->gpa_list[gpa_n].page.basepfn = cur;
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pages -= additional_pages + 1;
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cur += additional_pages + 1;
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gpa_n++;
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} while (pages > 0);
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return gpa_n;
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}
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EXPORT_SYMBOL_GPL(hyperv_fill_flush_guest_mapping_list);
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int hyperv_flush_guest_mapping_range(u64 as,
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hyperv_fill_flush_list_func fill_flush_list_func, void *data)
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{
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struct hv_guest_mapping_flush_list **flush_pcpu;
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struct hv_guest_mapping_flush_list *flush;
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u64 status = 0;
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unsigned long flags;
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int ret = -ENOTSUPP;
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int gpa_n = 0;
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if (!hv_hypercall_pg || !fill_flush_list_func)
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goto fault;
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local_irq_save(flags);
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flush_pcpu = (struct hv_guest_mapping_flush_list **)
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this_cpu_ptr(hyperv_pcpu_input_arg);
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flush = *flush_pcpu;
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if (unlikely(!flush)) {
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local_irq_restore(flags);
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goto fault;
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}
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flush->address_space = as;
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flush->flags = 0;
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gpa_n = fill_flush_list_func(flush, data);
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if (gpa_n < 0) {
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local_irq_restore(flags);
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goto fault;
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}
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status = hv_do_rep_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST,
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gpa_n, 0, flush, NULL);
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local_irq_restore(flags);
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if (!(status & HV_HYPERCALL_RESULT_MASK))
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ret = 0;
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else
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ret = status;
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fault:
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trace_hyperv_nested_flush_guest_mapping_range(as, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping_range);
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