Archipelago » qemu

/*

 * PowerPC KVM support

 *

 * Copyright IBM Corp. 2008

 *

 * Authors:

 *  Hollis Blanchard <hollisb@us.ibm.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 "qemu-common.h"

#include "qemu/timer.h"

#include "kvm_ppc.h"

#include "sysemu/device_tree.h"

#include "qemu/main-loop.h"

#define PROC_DEVTREE_PATH "/proc/device-tree"

static QEMUTimer *kvmppc_timer;

static unsigned int kvmppc_timer_rate;

static void kvmppc_timer_hack(void *opaque)

{

    qemu_notify_event();

    timer_mod(kvmppc_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + kvmppc_timer_rate);

}

void kvmppc_init(void)

{

    /* XXX The only reason KVM yields control back to qemu is device IO. Since

     * an idle guest does no IO, qemu's device model will never get a chance to

     * run. So, until QEMU gains IO threads, we create this timer to ensure

     * that the device model gets a chance to run. */

    kvmppc_timer_rate = get_ticks_per_sec() / 10;

    kvmppc_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &kvmppc_timer_hack, NULL);

    timer_mod(kvmppc_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + kvmppc_timer_rate);

}