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// SPDX-License-Identifier: GPL-2.0
/*
* Hyper-V nested virtualization code.
*
* Copyright (C) 2018, Microsoft, Inc.
*
* Author : Lan Tianyu <Tianyu.Lan@microsoft.com>
*/
#include <linux/types.h>
#include <asm/hyperv-tlfs.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_pcpu;
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_pcpu = (struct hv_guest_mapping_flush **)
this_cpu_ptr(hyperv_pcpu_input_arg);
flush = *flush_pcpu;
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 (!(status & HV_HYPERCALL_RESULT_MASK))
ret = 0;
fault:
trace_hyperv_nested_flush_guest_mapping(as, ret);
return ret;
}
EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping);
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