![Long Li](/assets/img/avatar_default.png)
The host keeps sending heartbeat packets independent of the guest responding to them. Even though we respond to the heartbeat messages at interrupt level, we can have situations where there maybe multiple heartbeat messages pending that have not been responded to. For instance this occurs when the VM is paused and the host continues to send the heartbeat messages. Address this issue by draining and responding to all the heartbeat messages that maybe pending. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> CC: Stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
500 lines
12 KiB
C
500 lines
12 KiB
C
/*
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* Copyright (c) 2010, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sysctl.h>
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#include <linux/reboot.h>
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#include <linux/hyperv.h>
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#include "hyperv_vmbus.h"
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#define SD_MAJOR 3
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#define SD_MINOR 0
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#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
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#define SD_MAJOR_1 1
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#define SD_VERSION_1 (SD_MAJOR_1 << 16 | SD_MINOR)
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#define TS_MAJOR 4
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#define TS_MINOR 0
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#define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)
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#define TS_MAJOR_1 1
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#define TS_VERSION_1 (TS_MAJOR_1 << 16 | TS_MINOR)
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#define TS_MAJOR_3 3
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#define TS_VERSION_3 (TS_MAJOR_3 << 16 | TS_MINOR)
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#define HB_MAJOR 3
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#define HB_MINOR 0
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#define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)
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#define HB_MAJOR_1 1
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#define HB_VERSION_1 (HB_MAJOR_1 << 16 | HB_MINOR)
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static int sd_srv_version;
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static int ts_srv_version;
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static int hb_srv_version;
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static int util_fw_version;
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static void shutdown_onchannelcallback(void *context);
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static struct hv_util_service util_shutdown = {
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.util_cb = shutdown_onchannelcallback,
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};
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static int hv_timesync_init(struct hv_util_service *srv);
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static void hv_timesync_deinit(void);
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static void timesync_onchannelcallback(void *context);
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static struct hv_util_service util_timesynch = {
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.util_cb = timesync_onchannelcallback,
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.util_init = hv_timesync_init,
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.util_deinit = hv_timesync_deinit,
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};
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static void heartbeat_onchannelcallback(void *context);
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static struct hv_util_service util_heartbeat = {
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.util_cb = heartbeat_onchannelcallback,
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};
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static struct hv_util_service util_kvp = {
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.util_cb = hv_kvp_onchannelcallback,
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.util_init = hv_kvp_init,
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.util_deinit = hv_kvp_deinit,
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};
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static struct hv_util_service util_vss = {
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.util_cb = hv_vss_onchannelcallback,
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.util_init = hv_vss_init,
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.util_deinit = hv_vss_deinit,
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};
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static struct hv_util_service util_fcopy = {
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.util_cb = hv_fcopy_onchannelcallback,
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.util_init = hv_fcopy_init,
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.util_deinit = hv_fcopy_deinit,
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};
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static void perform_shutdown(struct work_struct *dummy)
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{
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orderly_poweroff(true);
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}
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/*
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* Perform the shutdown operation in a thread context.
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*/
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static DECLARE_WORK(shutdown_work, perform_shutdown);
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static void shutdown_onchannelcallback(void *context)
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{
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struct vmbus_channel *channel = context;
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u32 recvlen;
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u64 requestid;
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bool execute_shutdown = false;
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u8 *shut_txf_buf = util_shutdown.recv_buffer;
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struct shutdown_msg_data *shutdown_msg;
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struct icmsg_hdr *icmsghdrp;
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struct icmsg_negotiate *negop = NULL;
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vmbus_recvpacket(channel, shut_txf_buf,
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PAGE_SIZE, &recvlen, &requestid);
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if (recvlen > 0) {
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icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
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sizeof(struct vmbuspipe_hdr)];
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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vmbus_prep_negotiate_resp(icmsghdrp, negop,
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shut_txf_buf, util_fw_version,
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sd_srv_version);
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} else {
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shutdown_msg =
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(struct shutdown_msg_data *)&shut_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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switch (shutdown_msg->flags) {
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case 0:
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case 1:
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icmsghdrp->status = HV_S_OK;
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execute_shutdown = true;
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pr_info("Shutdown request received -"
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" graceful shutdown initiated\n");
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break;
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default:
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icmsghdrp->status = HV_E_FAIL;
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execute_shutdown = false;
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pr_info("Shutdown request received -"
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" Invalid request\n");
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break;
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}
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}
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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vmbus_sendpacket(channel, shut_txf_buf,
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recvlen, requestid,
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VM_PKT_DATA_INBAND, 0);
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}
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if (execute_shutdown == true)
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schedule_work(&shutdown_work);
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}
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/*
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* Set the host time in a process context.
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*/
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struct adj_time_work {
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struct work_struct work;
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u64 host_time;
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u64 ref_time;
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u8 flags;
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};
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static void hv_set_host_time(struct work_struct *work)
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{
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struct adj_time_work *wrk;
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s64 host_tns;
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u64 newtime;
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struct timespec host_ts;
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wrk = container_of(work, struct adj_time_work, work);
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newtime = wrk->host_time;
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if (ts_srv_version > TS_VERSION_3) {
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/*
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* Some latency has been introduced since Hyper-V generated
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* its time sample. Take that latency into account before
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* using TSC reference time sample from Hyper-V.
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*
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* This sample is given by TimeSync v4 and above hosts.
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*/
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u64 current_tick;
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rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
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newtime += (current_tick - wrk->ref_time);
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}
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host_tns = (newtime - WLTIMEDELTA) * 100;
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host_ts = ns_to_timespec(host_tns);
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do_settimeofday(&host_ts);
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}
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/*
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* 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. This bit is
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* considered a hard request to discipline the clock.
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*
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* ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is
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* typically used as a hint to the guest. The guest is under no obligation
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* to discipline the clock.
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*/
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static struct adj_time_work wrk;
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static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 flags)
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{
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/*
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* This check is safe since we are executing in the
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* interrupt context and time synch messages arre always
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* delivered on the same CPU.
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*/
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if (work_pending(&wrk.work))
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return;
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wrk.host_time = hosttime;
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wrk.ref_time = reftime;
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wrk.flags = flags;
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if ((flags & (ICTIMESYNCFLAG_SYNC | ICTIMESYNCFLAG_SAMPLE)) != 0) {
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schedule_work(&wrk.work);
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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 timesync_onchannelcallback(void *context)
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{
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struct vmbus_channel *channel = context;
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u32 recvlen;
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u64 requestid;
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struct icmsg_hdr *icmsghdrp;
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struct ictimesync_data *timedatap;
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struct ictimesync_ref_data *refdata;
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u8 *time_txf_buf = util_timesynch.recv_buffer;
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struct icmsg_negotiate *negop = NULL;
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vmbus_recvpacket(channel, time_txf_buf,
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PAGE_SIZE, &recvlen, &requestid);
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if (recvlen > 0) {
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icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
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sizeof(struct vmbuspipe_hdr)];
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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vmbus_prep_negotiate_resp(icmsghdrp, negop,
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time_txf_buf,
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util_fw_version,
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ts_srv_version);
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pr_info("Using TimeSync version %d.%d\n",
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ts_srv_version >> 16, ts_srv_version & 0xFFFF);
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} else {
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if (ts_srv_version > TS_VERSION_3) {
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refdata = (struct ictimesync_ref_data *)
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&time_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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adj_guesttime(refdata->parenttime,
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refdata->vmreferencetime,
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refdata->flags);
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} else {
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timedatap = (struct ictimesync_data *)
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&time_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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adj_guesttime(timedatap->parenttime,
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0,
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timedatap->flags);
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}
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}
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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vmbus_sendpacket(channel, time_txf_buf,
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recvlen, requestid,
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VM_PKT_DATA_INBAND, 0);
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}
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}
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/*
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* Heartbeat functionality.
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* Every two seconds, Hyper-V send us a heartbeat request message.
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* we respond to this message, and Hyper-V knows we are alive.
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*/
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static void heartbeat_onchannelcallback(void *context)
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{
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struct vmbus_channel *channel = context;
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u32 recvlen;
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u64 requestid;
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struct icmsg_hdr *icmsghdrp;
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struct heartbeat_msg_data *heartbeat_msg;
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u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
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struct icmsg_negotiate *negop = NULL;
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while (1) {
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vmbus_recvpacket(channel, hbeat_txf_buf,
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PAGE_SIZE, &recvlen, &requestid);
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if (!recvlen)
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break;
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icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
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sizeof(struct vmbuspipe_hdr)];
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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vmbus_prep_negotiate_resp(icmsghdrp, negop,
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hbeat_txf_buf, util_fw_version,
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hb_srv_version);
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} else {
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heartbeat_msg =
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(struct heartbeat_msg_data *)&hbeat_txf_buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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heartbeat_msg->seq_num += 1;
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}
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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vmbus_sendpacket(channel, hbeat_txf_buf,
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recvlen, requestid,
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VM_PKT_DATA_INBAND, 0);
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}
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}
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static int util_probe(struct hv_device *dev,
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const struct hv_vmbus_device_id *dev_id)
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{
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struct hv_util_service *srv =
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(struct hv_util_service *)dev_id->driver_data;
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int ret;
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srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
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if (!srv->recv_buffer)
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return -ENOMEM;
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srv->channel = dev->channel;
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if (srv->util_init) {
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ret = srv->util_init(srv);
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if (ret) {
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ret = -ENODEV;
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goto error1;
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}
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}
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/*
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* The set of services managed by the util driver are not performance
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* critical and do not need batched reading. Furthermore, some services
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* such as KVP can only handle one message from the host at a time.
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* Turn off batched reading for all util drivers before we open the
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* channel.
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*/
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set_channel_read_state(dev->channel, false);
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hv_set_drvdata(dev, srv);
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/*
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* Based on the host; initialize the framework and
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* service version numbers we will negotiate.
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*/
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switch (vmbus_proto_version) {
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case (VERSION_WS2008):
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util_fw_version = UTIL_WS2K8_FW_VERSION;
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sd_srv_version = SD_VERSION_1;
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ts_srv_version = TS_VERSION_1;
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hb_srv_version = HB_VERSION_1;
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break;
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case(VERSION_WIN10):
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util_fw_version = UTIL_FW_VERSION;
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sd_srv_version = SD_VERSION;
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ts_srv_version = TS_VERSION;
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hb_srv_version = HB_VERSION;
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break;
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default:
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util_fw_version = UTIL_FW_VERSION;
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sd_srv_version = SD_VERSION;
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ts_srv_version = TS_VERSION_3;
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hb_srv_version = HB_VERSION;
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}
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ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
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srv->util_cb, dev->channel);
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if (ret)
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goto error;
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return 0;
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error:
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if (srv->util_deinit)
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srv->util_deinit();
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error1:
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kfree(srv->recv_buffer);
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return ret;
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}
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static int util_remove(struct hv_device *dev)
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{
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struct hv_util_service *srv = hv_get_drvdata(dev);
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if (srv->util_deinit)
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srv->util_deinit();
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vmbus_close(dev->channel);
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kfree(srv->recv_buffer);
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return 0;
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}
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static const struct hv_vmbus_device_id id_table[] = {
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/* Shutdown guid */
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{ HV_SHUTDOWN_GUID,
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.driver_data = (unsigned long)&util_shutdown
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},
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/* Time synch guid */
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{ HV_TS_GUID,
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.driver_data = (unsigned long)&util_timesynch
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},
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/* Heartbeat guid */
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{ HV_HEART_BEAT_GUID,
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.driver_data = (unsigned long)&util_heartbeat
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},
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/* KVP guid */
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{ HV_KVP_GUID,
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.driver_data = (unsigned long)&util_kvp
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},
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/* VSS GUID */
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{ HV_VSS_GUID,
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.driver_data = (unsigned long)&util_vss
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},
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/* File copy GUID */
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{ HV_FCOPY_GUID,
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.driver_data = (unsigned long)&util_fcopy
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},
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{ },
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};
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MODULE_DEVICE_TABLE(vmbus, id_table);
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/* The one and only one */
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static struct hv_driver util_drv = {
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.name = "hv_util",
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.id_table = id_table,
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.probe = util_probe,
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.remove = util_remove,
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};
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static int hv_timesync_init(struct hv_util_service *srv)
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{
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INIT_WORK(&wrk.work, hv_set_host_time);
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return 0;
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}
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static void hv_timesync_deinit(void)
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{
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cancel_work_sync(&wrk.work);
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}
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static int __init init_hyperv_utils(void)
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{
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pr_info("Registering HyperV Utility Driver\n");
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return vmbus_driver_register(&util_drv);
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}
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static void exit_hyperv_utils(void)
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{
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pr_info("De-Registered HyperV Utility Driver\n");
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vmbus_driver_unregister(&util_drv);
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}
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module_init(init_hyperv_utils);
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module_exit(exit_hyperv_utils);
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MODULE_DESCRIPTION("Hyper-V Utilities");
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MODULE_LICENSE("GPL");
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