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hyperv: Register the MSR-based timecounter during SI_SUB_HYPERVISOR

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This reverts commit 9ef7df022a ("hyperv: Register hyperv_timecounter
later during boot") and adds a comment explaining why the timecounter
needs to be registered as early as it is.

PR:		259878
Fixes:	9ef7df022a ("hyperv: Register hyperv_timecounter later during boot")
Reviewed by:	kib
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33014
This commit is contained in:
Mark Johnston 2021-11-19 17:30:05 -05:00
parent 3339950117
commit ed6a9452be
1 changed files with 7 additions and 9 deletions
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16
sys/dev/hyperv/vmbus/hyperv.c
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@ -247,15 +247,12 @@ hyperv_init(void *dummy __unused)
/* Set guest id */
wrmsr(MSR_HV_GUEST_OS_ID, MSR_HV_GUESTID_FREEBSD);
}
SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
NULL);
static void
hyperv_tc_init(void *arg __unused)
{
if (hyperv_features & CPUID_HV_MSR_TIME_REFCNT) {
/* Register Hyper-V timecounter */
/*
* Register Hyper-V timecounter. This should be done as early
* as possible to let DELAY() work, since the 8254 PIT is not
* reliably emulated or even available.
*/
tc_init(&hyperv_timecounter);
/*
@ -265,7 +262,8 @@ hyperv_tc_init(void *arg __unused)
hyperv_tc64 = hyperv_tc64_rdmsr;
}
}
SYSINIT(hyperv_tc_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, hyperv_tc_init, NULL);
SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
NULL);
static void
hypercall_memfree(void)