1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Linux 2.6.32 and later Kernel module for VMware MVP Hypervisor Support
*
* Copyright (C) 2010-2012 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; see the file COPYING. If not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#line 5
/**
* @file
*
* @brief MVP host kernel implementation of monitor timers
*
* The monitor sends requests that are simply a 64-bit absolute time that it
* wants a reply. If it changes its mind, it simply sends a different 64-bit
* absolute time. It is tolerant of us replying too soon, so if we miss the
* update to a later time, it doesn't matter, the monitor will re-send the
* request for the later time. The only time we should miss an update to a
* sooner time is when we are about to send the reply to the old time anyway,
* in which case the monitor sees a reply as quickly as we can generate them,
* so no harm there either.
*/
#include <linux/module.h>
#include <linux/hrtimer.h>
#include "mvp.h"
#include "mvp_timer.h"
#include "actions.h"
#include "mvpkm_kernel.h"
/**
* @brief Linux timer callback
* @param timer The linux timer raised
* @return Status to not restart the timer
*/
static enum hrtimer_restart
MonitorTimerCB(struct hrtimer *timer)
{
MvpkmVM *vm = container_of(timer, MvpkmVM, monTimer.timer);
Mvpkm_WakeGuest(vm, ACTION_TIMER);
return HRTIMER_NORESTART;
}
/**
* @brief Initialize vm associated timer
* @param vm which virtual machine we're running
*/
void
MonitorTimer_Setup(MvpkmVM *vm)
{
MonTimer *monTimer = &vm->monTimer;
monTimer->vm = vm;
hrtimer_init(&monTimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
monTimer->timer.function = MonitorTimerCB;
}
/**
* @brief New timer request from monitor
* @param monTimer Monitor timer
* @param when64 Timer target value
*/
void
MonitorTimer_Request(MonTimer *monTimer, uint64 when64)
{
if (when64) {
ktime_t kt;
/*
* Simple conversion, assuming RATE64 is 1e+9
*/
kt = ns_to_ktime(when64);
ASSERT_ON_COMPILE(MVP_TIMER_RATE64 == 1000000000);
/*
* Start the timer. If it was already active, it will remove
* the previous expiration time. Linux handles correctly timer
* with deadline in the past, and forces a safety minimal delta
* for closer timer deadlines.
*/
hrtimer_start(&monTimer->timer, kt, HRTIMER_MODE_ABS);
} else {
/*
* Cancel a pending request. If there is none, this will do nothing.
* If it's too late, monitor tolerance will forgive us.
*/
hrtimer_cancel(&monTimer->timer);
}
}
|
