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/******************************************************************************
* arch/x86/guest/hypervisor.c
*
* Support for detecting and running under a hypervisor.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; If not, see <http://www.gnu.org/licenses/>.
*
* Copyright (c) 2019 Microsoft.
*/
#include <xen/cpumask.h>
#include <xen/init.h>
#include <xen/types.h>
#include <asm/cache.h>
#include <asm/guest.h>
static struct hypervisor_ops __read_mostly ops;
const char *__init hypervisor_probe(void)
{
const struct hypervisor_ops *fns;
if ( !cpu_has_hypervisor )
return NULL;
fns = xg_probe();
if ( !fns )
/*
* Detection of Hyper-V must come after Xen to avoid false positive due
* to viridian support
*/
fns = hyperv_probe();
if ( fns )
ops = *fns;
return ops.name;
}
void __init hypervisor_setup(void)
{
if ( ops.setup )
ops.setup();
/* Check if assisted flush is available and disable the TLB clock if so. */
if ( !hypervisor_flush_tlb(cpumask_of(smp_processor_id()), NULL, 0) )
tlb_clk_enabled = false;
}
int hypervisor_ap_setup(void)
{
if ( ops.ap_setup )
return ops.ap_setup();
return 0;
}
void hypervisor_resume(void)
{
if ( ops.resume )
ops.resume();
}
void __init hypervisor_e820_fixup(struct e820map *e820)
{
if ( ops.e820_fixup )
ops.e820_fixup(e820);
}
int hypervisor_flush_tlb(const cpumask_t *mask, const void *va,
unsigned int flags)
{
if ( ops.flush_tlb )
return alternative_call(ops.flush_tlb, mask, va, flags);
return -EOPNOTSUPP;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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