xref: /freebsd/sys/dev/hyperv/vmbus/hyperv.c (revision 562d480b7d140b0caf9cb472634f31c06291ce0e)
1b7bb4816SSepherosa Ziehau /*-
2b7bb4816SSepherosa Ziehau  * Copyright (c) 2009-2012,2016 Microsoft Corp.
3b7bb4816SSepherosa Ziehau  * Copyright (c) 2012 NetApp Inc.
4b7bb4816SSepherosa Ziehau  * Copyright (c) 2012 Citrix Inc.
5b7bb4816SSepherosa Ziehau  * All rights reserved.
6b7bb4816SSepherosa Ziehau  *
7b7bb4816SSepherosa Ziehau  * Redistribution and use in source and binary forms, with or without
8b7bb4816SSepherosa Ziehau  * modification, are permitted provided that the following conditions
9b7bb4816SSepherosa Ziehau  * are met:
10b7bb4816SSepherosa Ziehau  * 1. Redistributions of source code must retain the above copyright
11b7bb4816SSepherosa Ziehau  *    notice unmodified, this list of conditions, and the following
12b7bb4816SSepherosa Ziehau  *    disclaimer.
13b7bb4816SSepherosa Ziehau  * 2. Redistributions in binary form must reproduce the above copyright
14b7bb4816SSepherosa Ziehau  *    notice, this list of conditions and the following disclaimer in the
15b7bb4816SSepherosa Ziehau  *    documentation and/or other materials provided with the distribution.
16b7bb4816SSepherosa Ziehau  *
17b7bb4816SSepherosa Ziehau  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18b7bb4816SSepherosa Ziehau  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19b7bb4816SSepherosa Ziehau  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20b7bb4816SSepherosa Ziehau  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21b7bb4816SSepherosa Ziehau  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22b7bb4816SSepherosa Ziehau  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23b7bb4816SSepherosa Ziehau  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24b7bb4816SSepherosa Ziehau  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25b7bb4816SSepherosa Ziehau  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26b7bb4816SSepherosa Ziehau  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27b7bb4816SSepherosa Ziehau  */
28b7bb4816SSepherosa Ziehau 
29b7bb4816SSepherosa Ziehau /**
30b7bb4816SSepherosa Ziehau  * Implements low-level interactions with Hypver-V/Azure
31b7bb4816SSepherosa Ziehau  */
32b7bb4816SSepherosa Ziehau #include <sys/cdefs.h>
33b7bb4816SSepherosa Ziehau __FBSDID("$FreeBSD$");
34b7bb4816SSepherosa Ziehau 
35b7bb4816SSepherosa Ziehau #include <sys/param.h>
36b7bb4816SSepherosa Ziehau #include <sys/kernel.h>
37b7bb4816SSepherosa Ziehau #include <sys/malloc.h>
38b7bb4816SSepherosa Ziehau #include <sys/pcpu.h>
39b7bb4816SSepherosa Ziehau #include <sys/timetc.h>
40b7bb4816SSepherosa Ziehau #include <machine/bus.h>
41b7bb4816SSepherosa Ziehau #include <machine/md_var.h>
42b7bb4816SSepherosa Ziehau #include <vm/vm.h>
43b7bb4816SSepherosa Ziehau #include <vm/vm_param.h>
44b7bb4816SSepherosa Ziehau #include <vm/pmap.h>
45b7bb4816SSepherosa Ziehau 
46b7bb4816SSepherosa Ziehau #include <dev/hyperv/include/hyperv_busdma.h>
47b7bb4816SSepherosa Ziehau #include <dev/hyperv/vmbus/hv_vmbus_priv.h>
48d8bf5168SSepherosa Ziehau #include <dev/hyperv/vmbus/hyperv_machdep.h>
49b7bb4816SSepherosa Ziehau #include <dev/hyperv/vmbus/hyperv_reg.h>
50b7bb4816SSepherosa Ziehau #include <dev/hyperv/vmbus/hyperv_var.h>
51b7bb4816SSepherosa Ziehau #include <dev/hyperv/vmbus/vmbus_var.h>
52b7bb4816SSepherosa Ziehau 
53b7bb4816SSepherosa Ziehau #define HYPERV_FREEBSD_BUILD		0ULL
54b7bb4816SSepherosa Ziehau #define HYPERV_FREEBSD_VERSION		((uint64_t)__FreeBSD_version)
55b7bb4816SSepherosa Ziehau #define HYPERV_FREEBSD_OSID		0ULL
56b7bb4816SSepherosa Ziehau 
57b7bb4816SSepherosa Ziehau #define MSR_HV_GUESTID_BUILD_FREEBSD	\
58b7bb4816SSepherosa Ziehau 	(HYPERV_FREEBSD_BUILD & MSR_HV_GUESTID_BUILD_MASK)
59b7bb4816SSepherosa Ziehau #define MSR_HV_GUESTID_VERSION_FREEBSD	\
60b7bb4816SSepherosa Ziehau 	((HYPERV_FREEBSD_VERSION << MSR_HV_GUESTID_VERSION_SHIFT) & \
61b7bb4816SSepherosa Ziehau 	 MSR_HV_GUESTID_VERSION_MASK)
62b7bb4816SSepherosa Ziehau #define MSR_HV_GUESTID_OSID_FREEBSD	\
63b7bb4816SSepherosa Ziehau 	((HYPERV_FREEBSD_OSID << MSR_HV_GUESTID_OSID_SHIFT) & \
64b7bb4816SSepherosa Ziehau 	 MSR_HV_GUESTID_OSID_MASK)
65b7bb4816SSepherosa Ziehau 
66b7bb4816SSepherosa Ziehau #define MSR_HV_GUESTID_FREEBSD		\
67b7bb4816SSepherosa Ziehau 	(MSR_HV_GUESTID_BUILD_FREEBSD |	\
68b7bb4816SSepherosa Ziehau 	 MSR_HV_GUESTID_VERSION_FREEBSD | \
69b7bb4816SSepherosa Ziehau 	 MSR_HV_GUESTID_OSID_FREEBSD |	\
70b7bb4816SSepherosa Ziehau 	 MSR_HV_GUESTID_OSTYPE_FREEBSD)
71b7bb4816SSepherosa Ziehau 
72b7bb4816SSepherosa Ziehau struct hypercall_ctx {
73b7bb4816SSepherosa Ziehau 	void			*hc_addr;
74b7bb4816SSepherosa Ziehau 	struct hyperv_dma	hc_dma;
75b7bb4816SSepherosa Ziehau };
76b7bb4816SSepherosa Ziehau 
77b7bb4816SSepherosa Ziehau static u_int	hyperv_get_timecount(struct timecounter *tc);
78b7bb4816SSepherosa Ziehau 
79b7bb4816SSepherosa Ziehau u_int		hyperv_features;
80b7bb4816SSepherosa Ziehau u_int		hyperv_recommends;
81b7bb4816SSepherosa Ziehau 
82b7bb4816SSepherosa Ziehau static u_int	hyperv_pm_features;
83b7bb4816SSepherosa Ziehau static u_int	hyperv_features3;
84b7bb4816SSepherosa Ziehau 
85b7bb4816SSepherosa Ziehau static struct timecounter	hyperv_timecounter = {
86b7bb4816SSepherosa Ziehau 	.tc_get_timecount	= hyperv_get_timecount,
87b7bb4816SSepherosa Ziehau 	.tc_poll_pps		= NULL,
88b7bb4816SSepherosa Ziehau 	.tc_counter_mask	= 0xffffffff,
89b7bb4816SSepherosa Ziehau 	.tc_frequency		= HYPERV_TIMER_FREQ,
90b7bb4816SSepherosa Ziehau 	.tc_name		= "Hyper-V",
91b7bb4816SSepherosa Ziehau 	.tc_quality		= 2000,
92b7bb4816SSepherosa Ziehau 	.tc_flags		= 0,
93b7bb4816SSepherosa Ziehau 	.tc_priv		= NULL
94b7bb4816SSepherosa Ziehau };
95b7bb4816SSepherosa Ziehau 
96b7bb4816SSepherosa Ziehau static struct hypercall_ctx	hypercall_context;
97b7bb4816SSepherosa Ziehau 
98b7bb4816SSepherosa Ziehau static u_int
99b7bb4816SSepherosa Ziehau hyperv_get_timecount(struct timecounter *tc __unused)
100b7bb4816SSepherosa Ziehau {
101b7bb4816SSepherosa Ziehau 	return rdmsr(MSR_HV_TIME_REF_COUNT);
102b7bb4816SSepherosa Ziehau }
103b7bb4816SSepherosa Ziehau 
104236764b1SSepherosa Ziehau uint64_t
105236764b1SSepherosa Ziehau hypercall_post_message(bus_addr_t msg_paddr)
106236764b1SSepherosa Ziehau {
107236764b1SSepherosa Ziehau 	return hypercall_md(hypercall_context.hc_addr,
108236764b1SSepherosa Ziehau 	    HYPERCALL_POST_MESSAGE, msg_paddr, 0);
109236764b1SSepherosa Ziehau }
110236764b1SSepherosa Ziehau 
111e44bdd84SSepherosa Ziehau uint64_t
112*562d480bSSepherosa Ziehau hypercall_signal_event(bus_addr_t monprm_paddr)
113e44bdd84SSepherosa Ziehau {
114e44bdd84SSepherosa Ziehau 	return hypercall_md(hypercall_context.hc_addr,
115*562d480bSSepherosa Ziehau 	    HYPERCALL_SIGNAL_EVENT, monprm_paddr, 0);
116e44bdd84SSepherosa Ziehau }
117e44bdd84SSepherosa Ziehau 
118b7bb4816SSepherosa Ziehau int
119b7bb4816SSepherosa Ziehau hyperv_guid2str(const struct hv_guid *guid, char *buf, size_t sz)
120b7bb4816SSepherosa Ziehau {
121b7bb4816SSepherosa Ziehau 	const uint8_t *d = guid->data;
122b7bb4816SSepherosa Ziehau 
123b7bb4816SSepherosa Ziehau 	return snprintf(buf, sz, "%02x%02x%02x%02x-"
124b7bb4816SSepherosa Ziehau 	    "%02x%02x-%02x%02x-%02x%02x-"
125b7bb4816SSepherosa Ziehau 	    "%02x%02x%02x%02x%02x%02x",
126b7bb4816SSepherosa Ziehau 	    d[3], d[2], d[1], d[0],
127b7bb4816SSepherosa Ziehau 	    d[5], d[4], d[7], d[6], d[8], d[9],
128b7bb4816SSepherosa Ziehau 	    d[10], d[11], d[12], d[13], d[14], d[15]);
129b7bb4816SSepherosa Ziehau }
130b7bb4816SSepherosa Ziehau 
131b7bb4816SSepherosa Ziehau static bool
132b7bb4816SSepherosa Ziehau hyperv_identify(void)
133b7bb4816SSepherosa Ziehau {
134b7bb4816SSepherosa Ziehau 	u_int regs[4];
135b7bb4816SSepherosa Ziehau 	unsigned int maxleaf;
136b7bb4816SSepherosa Ziehau 
137b7bb4816SSepherosa Ziehau 	if (vm_guest != VM_GUEST_HV)
138b7bb4816SSepherosa Ziehau 		return (false);
139b7bb4816SSepherosa Ziehau 
140b7bb4816SSepherosa Ziehau 	do_cpuid(CPUID_LEAF_HV_MAXLEAF, regs);
141b7bb4816SSepherosa Ziehau 	maxleaf = regs[0];
142b7bb4816SSepherosa Ziehau 	if (maxleaf < CPUID_LEAF_HV_LIMITS)
143b7bb4816SSepherosa Ziehau 		return (false);
144b7bb4816SSepherosa Ziehau 
145b7bb4816SSepherosa Ziehau 	do_cpuid(CPUID_LEAF_HV_INTERFACE, regs);
146b7bb4816SSepherosa Ziehau 	if (regs[0] != CPUID_HV_IFACE_HYPERV)
147b7bb4816SSepherosa Ziehau 		return (false);
148b7bb4816SSepherosa Ziehau 
149b7bb4816SSepherosa Ziehau 	do_cpuid(CPUID_LEAF_HV_FEATURES, regs);
150b7bb4816SSepherosa Ziehau 	if ((regs[0] & CPUID_HV_MSR_HYPERCALL) == 0) {
151b7bb4816SSepherosa Ziehau 		/*
152b7bb4816SSepherosa Ziehau 		 * Hyper-V w/o Hypercall is impossible; someone
153b7bb4816SSepherosa Ziehau 		 * is faking Hyper-V.
154b7bb4816SSepherosa Ziehau 		 */
155b7bb4816SSepherosa Ziehau 		return (false);
156b7bb4816SSepherosa Ziehau 	}
157b7bb4816SSepherosa Ziehau 	hyperv_features = regs[0];
158b7bb4816SSepherosa Ziehau 	hyperv_pm_features = regs[2];
159b7bb4816SSepherosa Ziehau 	hyperv_features3 = regs[3];
160b7bb4816SSepherosa Ziehau 
161b7bb4816SSepherosa Ziehau 	do_cpuid(CPUID_LEAF_HV_IDENTITY, regs);
162b7bb4816SSepherosa Ziehau 	printf("Hyper-V Version: %d.%d.%d [SP%d]\n",
163b7bb4816SSepherosa Ziehau 	    regs[1] >> 16, regs[1] & 0xffff, regs[0], regs[2]);
164b7bb4816SSepherosa Ziehau 
165b7bb4816SSepherosa Ziehau 	printf("  Features=0x%b\n", hyperv_features,
166b7bb4816SSepherosa Ziehau 	    "\020"
167b7bb4816SSepherosa Ziehau 	    "\001VPRUNTIME"	/* MSR_HV_VP_RUNTIME */
168b7bb4816SSepherosa Ziehau 	    "\002TMREFCNT"	/* MSR_HV_TIME_REF_COUNT */
169b7bb4816SSepherosa Ziehau 	    "\003SYNIC"		/* MSRs for SynIC */
170b7bb4816SSepherosa Ziehau 	    "\004SYNTM"		/* MSRs for SynTimer */
171b7bb4816SSepherosa Ziehau 	    "\005APIC"		/* MSR_HV_{EOI,ICR,TPR} */
172b7bb4816SSepherosa Ziehau 	    "\006HYPERCALL"	/* MSR_HV_{GUEST_OS_ID,HYPERCALL} */
173b7bb4816SSepherosa Ziehau 	    "\007VPINDEX"	/* MSR_HV_VP_INDEX */
174b7bb4816SSepherosa Ziehau 	    "\010RESET"		/* MSR_HV_RESET */
175b7bb4816SSepherosa Ziehau 	    "\011STATS"		/* MSR_HV_STATS_ */
176b7bb4816SSepherosa Ziehau 	    "\012REFTSC"	/* MSR_HV_REFERENCE_TSC */
177b7bb4816SSepherosa Ziehau 	    "\013IDLE"		/* MSR_HV_GUEST_IDLE */
178b7bb4816SSepherosa Ziehau 	    "\014TMFREQ"	/* MSR_HV_{TSC,APIC}_FREQUENCY */
179b7bb4816SSepherosa Ziehau 	    "\015DEBUG");	/* MSR_HV_SYNTH_DEBUG_ */
180b7bb4816SSepherosa Ziehau 	printf("  PM Features=0x%b [C%u]\n",
181b7bb4816SSepherosa Ziehau 	    (hyperv_pm_features & ~CPUPM_HV_CSTATE_MASK),
182b7bb4816SSepherosa Ziehau 	    "\020"
183b7bb4816SSepherosa Ziehau 	    "\005C3HPET",	/* HPET is required for C3 state */
184b7bb4816SSepherosa Ziehau 	    CPUPM_HV_CSTATE(hyperv_pm_features));
185b7bb4816SSepherosa Ziehau 	printf("  Features3=0x%b\n", hyperv_features3,
186b7bb4816SSepherosa Ziehau 	    "\020"
187b7bb4816SSepherosa Ziehau 	    "\001MWAIT"		/* MWAIT */
188b7bb4816SSepherosa Ziehau 	    "\002DEBUG"		/* guest debug support */
189b7bb4816SSepherosa Ziehau 	    "\003PERFMON"	/* performance monitor */
190b7bb4816SSepherosa Ziehau 	    "\004PCPUDPE"	/* physical CPU dynamic partition event */
191b7bb4816SSepherosa Ziehau 	    "\005XMMHC"		/* hypercall input through XMM regs */
192b7bb4816SSepherosa Ziehau 	    "\006IDLE"		/* guest idle support */
193b7bb4816SSepherosa Ziehau 	    "\007SLEEP"		/* hypervisor sleep support */
194b7bb4816SSepherosa Ziehau 	    "\010NUMA"		/* NUMA distance query support */
195b7bb4816SSepherosa Ziehau 	    "\011TMFREQ"	/* timer frequency query (TSC, LAPIC) */
196b7bb4816SSepherosa Ziehau 	    "\012SYNCMC"	/* inject synthetic machine checks */
197b7bb4816SSepherosa Ziehau 	    "\013CRASH"		/* MSRs for guest crash */
198b7bb4816SSepherosa Ziehau 	    "\014DEBUGMSR"	/* MSRs for guest debug */
199b7bb4816SSepherosa Ziehau 	    "\015NPIEP"		/* NPIEP */
200b7bb4816SSepherosa Ziehau 	    "\016HVDIS");	/* disabling hypervisor */
201b7bb4816SSepherosa Ziehau 
202b7bb4816SSepherosa Ziehau 	do_cpuid(CPUID_LEAF_HV_RECOMMENDS, regs);
203b7bb4816SSepherosa Ziehau 	hyperv_recommends = regs[0];
204b7bb4816SSepherosa Ziehau 	if (bootverbose)
205b7bb4816SSepherosa Ziehau 		printf("  Recommends: %08x %08x\n", regs[0], regs[1]);
206b7bb4816SSepherosa Ziehau 
207b7bb4816SSepherosa Ziehau 	do_cpuid(CPUID_LEAF_HV_LIMITS, regs);
208b7bb4816SSepherosa Ziehau 	if (bootverbose) {
209b7bb4816SSepherosa Ziehau 		printf("  Limits: Vcpu:%d Lcpu:%d Int:%d\n",
210b7bb4816SSepherosa Ziehau 		    regs[0], regs[1], regs[2]);
211b7bb4816SSepherosa Ziehau 	}
212b7bb4816SSepherosa Ziehau 
213b7bb4816SSepherosa Ziehau 	if (maxleaf >= CPUID_LEAF_HV_HWFEATURES) {
214b7bb4816SSepherosa Ziehau 		do_cpuid(CPUID_LEAF_HV_HWFEATURES, regs);
215b7bb4816SSepherosa Ziehau 		if (bootverbose) {
216b7bb4816SSepherosa Ziehau 			printf("  HW Features: %08x, AMD: %08x\n",
217b7bb4816SSepherosa Ziehau 			    regs[0], regs[3]);
218b7bb4816SSepherosa Ziehau 		}
219b7bb4816SSepherosa Ziehau 	}
220b7bb4816SSepherosa Ziehau 
221b7bb4816SSepherosa Ziehau 	return (true);
222b7bb4816SSepherosa Ziehau }
223b7bb4816SSepherosa Ziehau 
224b7bb4816SSepherosa Ziehau static void
225b7bb4816SSepherosa Ziehau hyperv_init(void *dummy __unused)
226b7bb4816SSepherosa Ziehau {
227b7bb4816SSepherosa Ziehau 	if (!hyperv_identify()) {
228b7bb4816SSepherosa Ziehau 		/* Not Hyper-V; reset guest id to the generic one. */
229b7bb4816SSepherosa Ziehau 		if (vm_guest == VM_GUEST_HV)
230b7bb4816SSepherosa Ziehau 			vm_guest = VM_GUEST_VM;
231b7bb4816SSepherosa Ziehau 		return;
232b7bb4816SSepherosa Ziehau 	}
233b7bb4816SSepherosa Ziehau 
234b7bb4816SSepherosa Ziehau 	/* Set guest id */
235b7bb4816SSepherosa Ziehau 	wrmsr(MSR_HV_GUEST_OS_ID, MSR_HV_GUESTID_FREEBSD);
236b7bb4816SSepherosa Ziehau 
237b7bb4816SSepherosa Ziehau 	if (hyperv_features & CPUID_HV_MSR_TIME_REFCNT) {
238b7bb4816SSepherosa Ziehau 		/* Register Hyper-V timecounter */
239b7bb4816SSepherosa Ziehau 		tc_init(&hyperv_timecounter);
240b7bb4816SSepherosa Ziehau 	}
241b7bb4816SSepherosa Ziehau }
242b7bb4816SSepherosa Ziehau SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
243b7bb4816SSepherosa Ziehau     NULL);
244b7bb4816SSepherosa Ziehau 
245b7bb4816SSepherosa Ziehau static void
246b7bb4816SSepherosa Ziehau hypercall_memfree(void)
247b7bb4816SSepherosa Ziehau {
248b7bb4816SSepherosa Ziehau 	hyperv_dmamem_free(&hypercall_context.hc_dma,
249b7bb4816SSepherosa Ziehau 	    hypercall_context.hc_addr);
250b7bb4816SSepherosa Ziehau 	hypercall_context.hc_addr = NULL;
251b7bb4816SSepherosa Ziehau }
252b7bb4816SSepherosa Ziehau 
253b7bb4816SSepherosa Ziehau static void
254b7bb4816SSepherosa Ziehau hypercall_create(void *arg __unused)
255b7bb4816SSepherosa Ziehau {
256b7bb4816SSepherosa Ziehau 	uint64_t hc, hc_orig;
257b7bb4816SSepherosa Ziehau 
258b7bb4816SSepherosa Ziehau 	if (vm_guest != VM_GUEST_HV)
259b7bb4816SSepherosa Ziehau 		return;
260b7bb4816SSepherosa Ziehau 
261b7bb4816SSepherosa Ziehau 	hypercall_context.hc_addr = hyperv_dmamem_alloc(NULL, PAGE_SIZE, 0,
262b7bb4816SSepherosa Ziehau 	    PAGE_SIZE, &hypercall_context.hc_dma, BUS_DMA_WAITOK);
263b7bb4816SSepherosa Ziehau 	if (hypercall_context.hc_addr == NULL) {
264b7bb4816SSepherosa Ziehau 		printf("hyperv: Hypercall page allocation failed\n");
265b7bb4816SSepherosa Ziehau 		/* Can't perform any Hyper-V specific actions */
266b7bb4816SSepherosa Ziehau 		vm_guest = VM_GUEST_VM;
267b7bb4816SSepherosa Ziehau 		return;
268b7bb4816SSepherosa Ziehau 	}
269b7bb4816SSepherosa Ziehau 
270b7bb4816SSepherosa Ziehau 	/* Get the 'reserved' bits, which requires preservation. */
271b7bb4816SSepherosa Ziehau 	hc_orig = rdmsr(MSR_HV_HYPERCALL);
272b7bb4816SSepherosa Ziehau 
273b7bb4816SSepherosa Ziehau 	/*
274b7bb4816SSepherosa Ziehau 	 * Setup the Hypercall page.
275b7bb4816SSepherosa Ziehau 	 *
276b7bb4816SSepherosa Ziehau 	 * NOTE: 'reserved' bits MUST be preserved.
277b7bb4816SSepherosa Ziehau 	 */
278b7bb4816SSepherosa Ziehau 	hc = ((hypercall_context.hc_dma.hv_paddr >> PAGE_SHIFT) <<
279b7bb4816SSepherosa Ziehau 	    MSR_HV_HYPERCALL_PGSHIFT) |
280b7bb4816SSepherosa Ziehau 	    (hc_orig & MSR_HV_HYPERCALL_RSVD_MASK) |
281b7bb4816SSepherosa Ziehau 	    MSR_HV_HYPERCALL_ENABLE;
282b7bb4816SSepherosa Ziehau 	wrmsr(MSR_HV_HYPERCALL, hc);
283b7bb4816SSepherosa Ziehau 
284b7bb4816SSepherosa Ziehau 	/*
285b7bb4816SSepherosa Ziehau 	 * Confirm that Hypercall page did get setup.
286b7bb4816SSepherosa Ziehau 	 */
287b7bb4816SSepherosa Ziehau 	hc = rdmsr(MSR_HV_HYPERCALL);
288b7bb4816SSepherosa Ziehau 	if ((hc & MSR_HV_HYPERCALL_ENABLE) == 0) {
289b7bb4816SSepherosa Ziehau 		printf("hyperv: Hypercall setup failed\n");
290b7bb4816SSepherosa Ziehau 		hypercall_memfree();
291b7bb4816SSepherosa Ziehau 		/* Can't perform any Hyper-V specific actions */
292b7bb4816SSepherosa Ziehau 		vm_guest = VM_GUEST_VM;
293b7bb4816SSepherosa Ziehau 		return;
294b7bb4816SSepherosa Ziehau 	}
295b7bb4816SSepherosa Ziehau 	if (bootverbose)
296b7bb4816SSepherosa Ziehau 		printf("hyperv: Hypercall created\n");
297b7bb4816SSepherosa Ziehau }
298b7bb4816SSepherosa Ziehau SYSINIT(hypercall_ctor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_create, NULL);
299b7bb4816SSepherosa Ziehau 
300b7bb4816SSepherosa Ziehau static void
301b7bb4816SSepherosa Ziehau hypercall_destroy(void *arg __unused)
302b7bb4816SSepherosa Ziehau {
303b7bb4816SSepherosa Ziehau 	uint64_t hc;
304b7bb4816SSepherosa Ziehau 
305b7bb4816SSepherosa Ziehau 	if (hypercall_context.hc_addr == NULL)
306b7bb4816SSepherosa Ziehau 		return;
307b7bb4816SSepherosa Ziehau 
308b7bb4816SSepherosa Ziehau 	/* Disable Hypercall */
309b7bb4816SSepherosa Ziehau 	hc = rdmsr(MSR_HV_HYPERCALL);
310b7bb4816SSepherosa Ziehau 	wrmsr(MSR_HV_HYPERCALL, (hc & MSR_HV_HYPERCALL_RSVD_MASK));
311b7bb4816SSepherosa Ziehau 	hypercall_memfree();
312b7bb4816SSepherosa Ziehau 
313b7bb4816SSepherosa Ziehau 	if (bootverbose)
314b7bb4816SSepherosa Ziehau 		printf("hyperv: Hypercall destroyed\n");
315b7bb4816SSepherosa Ziehau }
316b7bb4816SSepherosa Ziehau SYSUNINIT(hypercall_dtor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_destroy,
317b7bb4816SSepherosa Ziehau     NULL);
318