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Code Issues Releases Activity

hyperv: Register hyperv_timecounter later during boot

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Previously the MSR-based timecounter was registered during
SI_SUB_HYPERVISOR, i.e., very early during boot, and before SI_SUB_LOCK.
After commit 621fd9dcb2 this triggers a panic since the timecounter
list lock is not yet initialized.

The hyperv timecounter does not need to be registered so early, so defer
that to SI_SUB_DRIVERS, at the same time the hyperv TSC timecounter is
registered.

Reported by:	whu
Approved by:	whu
Fixes:		621fd9dcb2 ("timecounter: Lock the timecounter list")
Sponsored by:	The FreeBSD Foundation

(cherry picked from commit 9ef7df022a)
This commit is contained in:
Mark Johnston 2021-10-25 13:08:38 -04:00
parent 9910716d01
commit a2ca269b38
1 changed files with 8 additions and 2 deletions
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10
sys/dev/hyperv/vmbus/hyperv.c
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@ -247,6 +247,13 @@ 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 */
tc_init(&hyperv_timecounter);
@ -258,8 +265,7 @@ hyperv_init(void *dummy __unused)
hyperv_tc64 = hyperv_tc64_rdmsr;
}
}
SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
NULL);
SYSINIT(hyperv_tc_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, hyperv_tc_init, NULL);
static void
hypercall_memfree(void)