// SPDX-License-Identifier: GPL-2.0 /* * 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);