i8254.c (27eb2c4b3d3e13f376a359e293c212a2e9407af5) i8254.c (9ed96e87c5748de4c2807ef17e81287c7304186c)
1/*
2 * 8253/8254 interval timer emulation
3 *
4 * Copyright (c) 2003-2004 Fabrice Bellard
5 * Copyright (c) 2006 Intel Corporation
6 * Copyright (c) 2007 Keir Fraser, XenSource Inc
7 * Copyright (c) 2008 Intel Corporation
8 * Copyright 2009 Red Hat, Inc. and/or its affiliates.

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32
33#define pr_fmt(fmt) "pit: " fmt
34
35#include <linux/kvm_host.h>
36#include <linux/slab.h>
37
38#include "irq.h"
39#include "i8254.h"
1/*
2 * 8253/8254 interval timer emulation
3 *
4 * Copyright (c) 2003-2004 Fabrice Bellard
5 * Copyright (c) 2006 Intel Corporation
6 * Copyright (c) 2007 Keir Fraser, XenSource Inc
7 * Copyright (c) 2008 Intel Corporation
8 * Copyright 2009 Red Hat, Inc. and/or its affiliates.

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32
33#define pr_fmt(fmt) "pit: " fmt
34
35#include <linux/kvm_host.h>
36#include <linux/slab.h>
37
38#include "irq.h"
39#include "i8254.h"
40#include "x86.h"
40
41#ifndef CONFIG_X86_64
42#define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
43#else
44#define mod_64(x, y) ((x) % (y))
45#endif
46
47#define RW_STATE_LSB 1

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344 ps->is_periodic = is_period;
345
346 ps->timer.function = pit_timer_fn;
347 ps->kvm = ps->pit->kvm;
348
349 atomic_set(&ps->pending, 0);
350 ps->irq_ack = 1;
351
41
42#ifndef CONFIG_X86_64
43#define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
44#else
45#define mod_64(x, y) ((x) % (y))
46#endif
47
48#define RW_STATE_LSB 1

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345 ps->is_periodic = is_period;
346
347 ps->timer.function = pit_timer_fn;
348 ps->kvm = ps->pit->kvm;
349
350 atomic_set(&ps->pending, 0);
351 ps->irq_ack = 1;
352
353 /*
354 * Do not allow the guest to program periodic timers with small
355 * interval, since the hrtimers are not throttled by the host
356 * scheduler.
357 */
358 if (ps->is_periodic) {
359 s64 min_period = min_timer_period_us * 1000LL;
360
361 if (ps->period < min_period) {
362 pr_info_ratelimited(
363 "kvm: requested %lld ns "
364 "i8254 timer period limited to %lld ns\n",
365 ps->period, min_period);
366 ps->period = min_period;
367 }
368 }
369
352 hrtimer_start(&ps->timer, ktime_add_ns(ktime_get(), interval),
353 HRTIMER_MODE_ABS);
354}
355
356static void pit_load_count(struct kvm *kvm, int channel, u32 val)
357{
358 struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state;
359

--- 398 unchanged lines hidden --- 		370 hrtimer_start(&ps->timer, ktime_add_ns(ktime_get(), interval),
371 HRTIMER_MODE_ABS);
372}
373
374static void pit_load_count(struct kvm *kvm, int channel, u32 val)
375{
376 struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state;
377

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