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/*
* QEMU Hyper-V support
*
* Copyright Red Hat, Inc. 2011
*
* Author: Vadim Rozenfeld <vrozenfe@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "hyperv.h"
static bool hyperv_vapic;
static bool hyperv_relaxed_timing;
static int hyperv_spinlock_attempts = HYPERV_SPINLOCK_NEVER_RETRY;
void hyperv_enable_vapic_recommended(bool val)
{
hyperv_vapic = val;
}
void hyperv_enable_relaxed_timing(bool val)
{
hyperv_relaxed_timing = val;
}
void hyperv_set_spinlock_retries(int val)
{
hyperv_spinlock_attempts = val;
if (hyperv_spinlock_attempts < 0xFFF) {
hyperv_spinlock_attempts = 0xFFF;
}
}
bool hyperv_enabled(void)
{
return hyperv_hypercall_available() || hyperv_relaxed_timing_enabled();
}
bool hyperv_hypercall_available(void)
{
if (hyperv_vapic ||
(hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY)) {
return true;
}
return false;
}
bool hyperv_vapic_recommended(void)
{
return hyperv_vapic;
}
bool hyperv_relaxed_timing_enabled(void)
{
return hyperv_relaxed_timing;
}
int hyperv_get_spinlock_retries(void)
{
return hyperv_spinlock_attempts;
}
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