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