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hyperv: Preserve required bits when disable Hypercall

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MFC after:	1 week
Sponsored by:	Microsoft OSTC
Differential Revision:	https://reviews.freebsd.org/D6530
This commit is contained in:
Sepherosa Ziehau 2016-05-25 06:01:47 +00:00
parent 6d6baea80d
commit dade2a02e3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=300655
1 changed files with 4 additions and 1 deletions
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5
sys/dev/hyperv/vmbus/hv_hv.c
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@ -390,11 +390,14 @@ SYSINIT(hypercall_ctor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_create, NULL);
static void
hypercall_destroy(void *arg __unused)
{
uint64_t hc;
if (hypercall_context.hc_addr == NULL)
return;
/* Disable Hypercall */
wrmsr(MSR_HV_HYPERCALL, 0);
hc = rdmsr(MSR_HV_HYPERCALL);
wrmsr(MSR_HV_HYPERCALL, (hc & MSR_HV_HYPERCALL_RSVD_MASK));
hypercall_memfree();
if (bootverbose)