Archipelago » qemu

/*

 * 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;

}