1 // SPDX-License-Identifier: GPL-2.0 2 3 /* 4 * Hyper-V nested virtualization code. 5 * 6 * Copyright (C) 2018, Microsoft, Inc. 7 * 8 * Author : Lan Tianyu <Tianyu.Lan@microsoft.com> 9 */ 10 11 12 #include <linux/types.h> 13 #include <asm/hyperv-tlfs.h> 14 #include <asm/mshyperv.h> 15 #include <asm/tlbflush.h> 16 17 #include <asm/trace/hyperv.h> 18 19 int hyperv_flush_guest_mapping(u64 as) 20 { 21 struct hv_guest_mapping_flush **flush_pcpu; 22 struct hv_guest_mapping_flush *flush; 23 u64 status; 24 unsigned long flags; 25 int ret = -ENOTSUPP; 26 27 if (!hv_hypercall_pg) 28 goto fault; 29 30 local_irq_save(flags); 31 32 flush_pcpu = (struct hv_guest_mapping_flush **) 33 this_cpu_ptr(hyperv_pcpu_input_arg); 34 35 flush = *flush_pcpu; 36 37 if (unlikely(!flush)) { 38 local_irq_restore(flags); 39 goto fault; 40 } 41 42 flush->address_space = as; 43 flush->flags = 0; 44 45 status = hv_do_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE, 46 flush, NULL); 47 local_irq_restore(flags); 48 49 if (!(status & HV_HYPERCALL_RESULT_MASK)) 50 ret = 0; 51 52 fault: 53 trace_hyperv_nested_flush_guest_mapping(as, ret); 54 return ret; 55 } 56 EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping); 57