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hv: timer: add periodic timer setup support

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and add MIN_TIMER_PERIOD_US for limit periodic timer frequency.
Now it's set to 500 us.

Signed-off-by: Li, Fei1 <fei1.li@intel.com>
This commit is contained in:
Li, Fei1
2018-04-25 15:14:44 +08:00
committed by lijinxia
parent 49ffc2cbb7
commit dd588828d9
4 changed files with 27 additions and 10 deletions
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4
arch/x86/guest/vlapic.c
View File

@@ -1576,7 +1576,7 @@ vlapic_reset(struct vlapic *vlapic)
vlapic->svr_last = lapic->svr;
initialize_timer(&vlapic->timer, NULL, NULL, 0);
initialize_timer(&vlapic->timer, NULL, NULL, 0, 0, 0);
}
void
@@ -1974,7 +1974,7 @@ vlapic_wrmsr(struct vcpu *vcpu, uint32_t msr, uint64_t val)
initialize_timer(&vlapic->timer,
tsc_periodic_time, (void *)vcpu,
val);
val, TICK_MODE_ONESHOT, 0);
if (add_timer(&vlapic->timer) != 0) {
pr_err("failed to add timer on VM %d",

7
arch/x86/timer.c
View File

@@ -37,6 +37,7 @@
#define MAX_TIMER_ACTIONS 32
#define TIMER_IRQ (NR_MAX_IRQS - 1)
#define CAL_MS 10
#define MIN_TIMER_PERIOD_US 500
uint64_t tsc_hz = 1000000000;
@@ -228,6 +229,12 @@ int timer_softirq(int pcpu_id)
run_timer(timer);
if (timer->mode == TICK_MODE_PERIODIC) {
timer->fire_tsc += max(timer->period_in_cycle,
US_TO_TICKS(MIN_TIMER_PERIOD_US));
add_timer(timer);
}
/* search next one */
timer = find_expired_timer(cpu_timer, rdtsc());
}