c72fc9d2b9
MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7627
223 lines
6.4 KiB
C
223 lines
6.4 KiB
C
/*-
|
|
* Copyright (c) 2014,2016 Microsoft Corp.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* A common driver for all hyper-V util services.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/reboot.h>
|
|
#include <sys/timetc.h>
|
|
#include <sys/syscallsubr.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/taskqueue.h>
|
|
|
|
#include <dev/hyperv/include/hyperv.h>
|
|
#include <dev/hyperv/include/vmbus.h>
|
|
#include <dev/hyperv/utilities/hv_utilreg.h>
|
|
#include "hv_util.h"
|
|
#include "vmbus_if.h"
|
|
|
|
#define HV_WLTIMEDELTA 116444736000000000L /* in 100ns unit */
|
|
#define HV_ICTIMESYNCFLAG_PROBE 0
|
|
#define HV_ICTIMESYNCFLAG_SYNC 1
|
|
#define HV_ICTIMESYNCFLAG_SAMPLE 2
|
|
#define HV_NANO_SEC_PER_SEC 1000000000
|
|
|
|
/* Time Sync data */
|
|
typedef struct {
|
|
uint64_t data;
|
|
} time_sync_data;
|
|
|
|
static const struct vmbus_ic_desc vmbus_timesync_descs[] = {
|
|
{
|
|
.ic_guid = { .hv_guid = {
|
|
0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
|
|
0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf } },
|
|
.ic_desc = "Hyper-V Timesync"
|
|
},
|
|
VMBUS_IC_DESC_END
|
|
};
|
|
|
|
struct hv_ictimesync_data {
|
|
uint64_t parenttime;
|
|
uint64_t childtime;
|
|
uint64_t roundtriptime;
|
|
uint8_t flags;
|
|
} __packed;
|
|
|
|
typedef struct hv_timesync_sc {
|
|
hv_util_sc util_sc;
|
|
struct task task;
|
|
time_sync_data time_msg;
|
|
} hv_timesync_sc;
|
|
|
|
/**
|
|
* Set host time based on time sync message from host
|
|
*/
|
|
static void
|
|
hv_set_host_time(void *context, int pending)
|
|
{
|
|
hv_timesync_sc *softc = (hv_timesync_sc*)context;
|
|
uint64_t hosttime = softc->time_msg.data;
|
|
struct timespec guest_ts, host_ts;
|
|
uint64_t host_tns;
|
|
int64_t diff;
|
|
int error;
|
|
|
|
host_tns = (hosttime - HV_WLTIMEDELTA) * 100;
|
|
host_ts.tv_sec = (time_t)(host_tns/HV_NANO_SEC_PER_SEC);
|
|
host_ts.tv_nsec = (long)(host_tns%HV_NANO_SEC_PER_SEC);
|
|
|
|
nanotime(&guest_ts);
|
|
|
|
diff = (int64_t)host_ts.tv_sec - (int64_t)guest_ts.tv_sec;
|
|
|
|
/*
|
|
* If host differs by 5 seconds then make the guest catch up
|
|
*/
|
|
if (diff > 5 || diff < -5) {
|
|
error = kern_clock_settime(curthread, CLOCK_REALTIME,
|
|
&host_ts);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Synchronize time with host after reboot, restore, etc.
|
|
*
|
|
* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
|
|
* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
|
|
* message after the timesync channel is opened. Since the hv_utils module is
|
|
* loaded after hv_vmbus, the first message is usually missed. The other
|
|
* thing is, systime is automatically set to emulated hardware clock which may
|
|
* not be UTC time or in the same time zone. So, to override these effects, we
|
|
* use the first 50 time samples for initial system time setting.
|
|
*/
|
|
static inline
|
|
void hv_adj_guesttime(hv_timesync_sc *sc, uint64_t hosttime, uint8_t flags)
|
|
{
|
|
sc->time_msg.data = hosttime;
|
|
|
|
if (((flags & HV_ICTIMESYNCFLAG_SYNC) != 0) ||
|
|
((flags & HV_ICTIMESYNCFLAG_SAMPLE) != 0)) {
|
|
taskqueue_enqueue(taskqueue_thread, &sc->task);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Time Sync Channel message handler
|
|
*/
|
|
static void
|
|
hv_timesync_cb(struct vmbus_channel *channel, void *context)
|
|
{
|
|
hv_vmbus_icmsg_hdr* icmsghdrp;
|
|
uint32_t recvlen;
|
|
uint64_t requestId;
|
|
int ret;
|
|
uint8_t* time_buf;
|
|
struct hv_ictimesync_data* timedatap;
|
|
hv_timesync_sc *softc;
|
|
|
|
softc = (hv_timesync_sc*)context;
|
|
time_buf = softc->util_sc.receive_buffer;
|
|
|
|
recvlen = softc->util_sc.ic_buflen;
|
|
ret = vmbus_chan_recv(channel, time_buf, &recvlen, &requestId);
|
|
KASSERT(ret != ENOBUFS, ("hvtimesync recvbuf is not large enough"));
|
|
/* XXX check recvlen to make sure that it contains enough data */
|
|
|
|
if ((ret == 0) && recvlen > 0) {
|
|
icmsghdrp = (struct hv_vmbus_icmsg_hdr *) &time_buf[
|
|
sizeof(struct hv_vmbus_pipe_hdr)];
|
|
|
|
if (icmsghdrp->icmsgtype == HV_ICMSGTYPE_NEGOTIATE) {
|
|
int error;
|
|
|
|
error = vmbus_ic_negomsg(&softc->util_sc, time_buf, &recvlen);
|
|
if (error)
|
|
return;
|
|
} else {
|
|
timedatap = (struct hv_ictimesync_data *) &time_buf[
|
|
sizeof(struct hv_vmbus_pipe_hdr) +
|
|
sizeof(struct hv_vmbus_icmsg_hdr)];
|
|
hv_adj_guesttime(softc, timedatap->parenttime, timedatap->flags);
|
|
}
|
|
|
|
icmsghdrp->icflags = HV_ICMSGHDRFLAG_TRANSACTION
|
|
| HV_ICMSGHDRFLAG_RESPONSE;
|
|
|
|
vmbus_chan_send(channel, VMBUS_CHANPKT_TYPE_INBAND, 0,
|
|
time_buf, recvlen, requestId);
|
|
}
|
|
}
|
|
|
|
static int
|
|
hv_timesync_probe(device_t dev)
|
|
{
|
|
|
|
return (vmbus_ic_probe(dev, vmbus_timesync_descs));
|
|
}
|
|
|
|
static int
|
|
hv_timesync_attach(device_t dev)
|
|
{
|
|
hv_timesync_sc *softc = device_get_softc(dev);
|
|
|
|
TASK_INIT(&softc->task, 1, hv_set_host_time, softc);
|
|
return hv_util_attach(dev, hv_timesync_cb);
|
|
}
|
|
|
|
static int
|
|
hv_timesync_detach(device_t dev)
|
|
{
|
|
hv_timesync_sc *softc = device_get_softc(dev);
|
|
|
|
taskqueue_drain(taskqueue_thread, &softc->task);
|
|
return hv_util_detach(dev);
|
|
}
|
|
|
|
static device_method_t timesync_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, hv_timesync_probe),
|
|
DEVMETHOD(device_attach, hv_timesync_attach),
|
|
DEVMETHOD(device_detach, hv_timesync_detach),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t timesync_driver = { "hvtimesync", timesync_methods, sizeof(hv_timesync_sc)};
|
|
|
|
static devclass_t timesync_devclass;
|
|
|
|
DRIVER_MODULE(hv_timesync, vmbus, timesync_driver, timesync_devclass, NULL, NULL);
|
|
MODULE_VERSION(hv_timesync, 1);
|
|
MODULE_DEPEND(hv_timesync, vmbus, 1, 1, 1);
|