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