diff options
Diffstat (limited to 'arch/x86/xen/time.c')
| -rw-r--r-- | arch/x86/xen/time.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index 6e29794573b7..befbdd8b17f0 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -28,7 +28,7 @@ #include "xen-ops.h" -/* Xen may fire a timer up to this many ns early */ +/* Minimum amount of time until next clock event fires */ #define TIMER_SLOP 100000 static u64 xen_sched_clock_offset __read_mostly; @@ -212,7 +212,7 @@ static int xen_timerop_set_next_event(unsigned long delta, return 0; } -static const struct clock_event_device xen_timerop_clockevent = { +static struct clock_event_device xen_timerop_clockevent __ro_after_init = { .name = "xen", .features = CLOCK_EVT_FEAT_ONESHOT, @@ -273,7 +273,7 @@ static int xen_vcpuop_set_next_event(unsigned long delta, return ret; } -static const struct clock_event_device xen_vcpuop_clockevent = { +static struct clock_event_device xen_vcpuop_clockevent __ro_after_init = { .name = "xen", .features = CLOCK_EVT_FEAT_ONESHOT, @@ -570,3 +570,17 @@ void __init xen_hvm_init_time_ops(void) x86_platform.set_wallclock = xen_set_wallclock; } #endif + +/* Kernel parameter to specify Xen timer slop */ +static int __init parse_xen_timer_slop(char *ptr) +{ + unsigned long slop = memparse(ptr, NULL); + + xen_timerop_clockevent.min_delta_ns = slop; + xen_timerop_clockevent.min_delta_ticks = slop; + xen_vcpuop_clockevent.min_delta_ns = slop; + xen_vcpuop_clockevent.min_delta_ticks = slop; + + return 0; +} +early_param("xen_timer_slop", parse_xen_timer_slop); |