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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2009, Microsoft Corporation.
4 *
5 * Authors:
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 * Hank Janssen <hjanssen@microsoft.com>
8 */
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/slab.h>
14#include <linux/vmalloc.h>
15#include <linux/hyperv.h>
16#include <linux/version.h>
17#include <linux/random.h>
18#include <linux/clockchips.h>
19#include <clocksource/hyperv_timer.h>
20#include <asm/mshyperv.h>
21#include "hyperv_vmbus.h"
22
23/* The one and only */
24struct hv_context hv_context;
25
26/*
27 * hv_init - Main initialization routine.
28 *
29 * This routine must be called before any other routines in here are called
30 */
31int hv_init(void)
32{
33 hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
34 if (!hv_context.cpu_context)
35 return -ENOMEM;
36 return 0;
37}
38
39/*
40 * hv_post_message - Post a message using the hypervisor message IPC.
41 *
42 * This involves a hypercall.
43 */
44int hv_post_message(union hv_connection_id connection_id,
45 enum hv_message_type message_type,
46 void *payload, size_t payload_size)
47{
48 struct hv_input_post_message *aligned_msg;
49 struct hv_per_cpu_context *hv_cpu;
50 u64 status;
51
52 if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
53 return -EMSGSIZE;
54
55 hv_cpu = get_cpu_ptr(hv_context.cpu_context);
56 aligned_msg = hv_cpu->post_msg_page;
57 aligned_msg->connectionid = connection_id;
58 aligned_msg->reserved = 0;
59 aligned_msg->message_type = message_type;
60 aligned_msg->payload_size = payload_size;
61 memcpy((void *)aligned_msg->payload, payload, payload_size);
62
63 status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
64
65 /* Preemption must remain disabled until after the hypercall
66 * so some other thread can't get scheduled onto this cpu and
67 * corrupt the per-cpu post_msg_page
68 */
69 put_cpu_ptr(hv_cpu);
70
71 return status & 0xFFFF;
72}
73
74int hv_synic_alloc(void)
75{
76 int cpu;
77 struct hv_per_cpu_context *hv_cpu;
78
79 /*
80 * First, zero all per-cpu memory areas so hv_synic_free() can
81 * detect what memory has been allocated and cleanup properly
82 * after any failures.
83 */
84 for_each_present_cpu(cpu) {
85 hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu);
86 memset(hv_cpu, 0, sizeof(*hv_cpu));
87 }
88
89 hv_context.hv_numa_map = kcalloc(nr_node_ids, sizeof(struct cpumask),
90 GFP_KERNEL);
91 if (hv_context.hv_numa_map == NULL) {
92 pr_err("Unable to allocate NUMA map\n");
93 goto err;
94 }
95
96 for_each_present_cpu(cpu) {
97 hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu);
98
99 tasklet_init(&hv_cpu->msg_dpc,
100 vmbus_on_msg_dpc, (unsigned long) hv_cpu);
101
102 hv_cpu->synic_message_page =
103 (void *)get_zeroed_page(GFP_ATOMIC);
104 if (hv_cpu->synic_message_page == NULL) {
105 pr_err("Unable to allocate SYNIC message page\n");
106 goto err;
107 }
108
109 hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
110 if (hv_cpu->synic_event_page == NULL) {
111 pr_err("Unable to allocate SYNIC event page\n");
112 goto err;
113 }
114
115 hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
116 if (hv_cpu->post_msg_page == NULL) {
117 pr_err("Unable to allocate post msg page\n");
118 goto err;
119 }
120
121 INIT_LIST_HEAD(&hv_cpu->chan_list);
122 }
123
124 return 0;
125err:
126 /*
127 * Any memory allocations that succeeded will be freed when
128 * the caller cleans up by calling hv_synic_free()
129 */
130 return -ENOMEM;
131}
132
133
134void hv_synic_free(void)
135{
136 int cpu;
137
138 for_each_present_cpu(cpu) {
139 struct hv_per_cpu_context *hv_cpu
140 = per_cpu_ptr(hv_context.cpu_context, cpu);
141
142 free_page((unsigned long)hv_cpu->synic_event_page);
143 free_page((unsigned long)hv_cpu->synic_message_page);
144 free_page((unsigned long)hv_cpu->post_msg_page);
145 }
146
147 kfree(hv_context.hv_numa_map);
148}
149
150/*
151 * hv_synic_init - Initialize the Synthetic Interrupt Controller.
152 *
153 * If it is already initialized by another entity (ie x2v shim), we need to
154 * retrieve the initialized message and event pages. Otherwise, we create and
155 * initialize the message and event pages.
156 */
157void hv_synic_enable_regs(unsigned int cpu)
158{
159 struct hv_per_cpu_context *hv_cpu
160 = per_cpu_ptr(hv_context.cpu_context, cpu);
161 union hv_synic_simp simp;
162 union hv_synic_siefp siefp;
163 union hv_synic_sint shared_sint;
164 union hv_synic_scontrol sctrl;
165
166 /* Setup the Synic's message page */
167 hv_get_simp(simp.as_uint64);
168 simp.simp_enabled = 1;
169 simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
170 >> PAGE_SHIFT;
171
172 hv_set_simp(simp.as_uint64);
173
174 /* Setup the Synic's event page */
175 hv_get_siefp(siefp.as_uint64);
176 siefp.siefp_enabled = 1;
177 siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
178 >> PAGE_SHIFT;
179
180 hv_set_siefp(siefp.as_uint64);
181
182 /* Setup the shared SINT. */
183 hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
184
185 shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
186 shared_sint.masked = false;
187 if (ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED)
188 shared_sint.auto_eoi = false;
189 else
190 shared_sint.auto_eoi = true;
191
192 hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
193
194 /* Enable the global synic bit */
195 hv_get_synic_state(sctrl.as_uint64);
196 sctrl.enable = 1;
197
198 hv_set_synic_state(sctrl.as_uint64);
199}
200
201int hv_synic_init(unsigned int cpu)
202{
203 hv_synic_enable_regs(cpu);
204
205 hv_stimer_init(cpu);
206
207 return 0;
208}
209
210/*
211 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
212 */
213void hv_synic_disable_regs(unsigned int cpu)
214{
215 union hv_synic_sint shared_sint;
216 union hv_synic_simp simp;
217 union hv_synic_siefp siefp;
218 union hv_synic_scontrol sctrl;
219
220 hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
221
222 shared_sint.masked = 1;
223
224 /* Need to correctly cleanup in the case of SMP!!! */
225 /* Disable the interrupt */
226 hv_set_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
227
228 hv_get_simp(simp.as_uint64);
229 simp.simp_enabled = 0;
230 simp.base_simp_gpa = 0;
231
232 hv_set_simp(simp.as_uint64);
233
234 hv_get_siefp(siefp.as_uint64);
235 siefp.siefp_enabled = 0;
236 siefp.base_siefp_gpa = 0;
237
238 hv_set_siefp(siefp.as_uint64);
239
240 /* Disable the global synic bit */
241 hv_get_synic_state(sctrl.as_uint64);
242 sctrl.enable = 0;
243 hv_set_synic_state(sctrl.as_uint64);
244}
245
246int hv_synic_cleanup(unsigned int cpu)
247{
248 struct vmbus_channel *channel, *sc;
249 bool channel_found = false;
250 unsigned long flags;
251
252 /*
253 * Search for channels which are bound to the CPU we're about to
254 * cleanup. In case we find one and vmbus is still connected we need to
255 * fail, this will effectively prevent CPU offlining. There is no way
256 * we can re-bind channels to different CPUs for now.
257 */
258 mutex_lock(&vmbus_connection.channel_mutex);
259 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
260 if (channel->target_cpu == cpu) {
261 channel_found = true;
262 break;
263 }
264 spin_lock_irqsave(&channel->lock, flags);
265 list_for_each_entry(sc, &channel->sc_list, sc_list) {
266 if (sc->target_cpu == cpu) {
267 channel_found = true;
268 break;
269 }
270 }
271 spin_unlock_irqrestore(&channel->lock, flags);
272 if (channel_found)
273 break;
274 }
275 mutex_unlock(&vmbus_connection.channel_mutex);
276
277 if (channel_found && vmbus_connection.conn_state == CONNECTED)
278 return -EBUSY;
279
280 hv_stimer_cleanup(cpu);
281
282 hv_synic_disable_regs(cpu);
283
284 return 0;
285}
1/*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 *
21 */
22#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23
24#include <linux/kernel.h>
25#include <linux/mm.h>
26#include <linux/slab.h>
27#include <linux/vmalloc.h>
28#include <linux/hyperv.h>
29#include <linux/version.h>
30#include <linux/random.h>
31#include <linux/clockchips.h>
32#include <asm/mshyperv.h>
33#include "hyperv_vmbus.h"
34
35/* The one and only */
36struct hv_context hv_context = {
37 .synic_initialized = false,
38};
39
40/*
41 * If false, we're using the old mechanism for stimer0 interrupts
42 * where it sends a VMbus message when it expires. The old
43 * mechanism is used when running on older versions of Hyper-V
44 * that don't support Direct Mode. While Hyper-V provides
45 * four stimer's per CPU, Linux uses only stimer0.
46 */
47static bool direct_mode_enabled;
48static int stimer0_irq;
49static int stimer0_vector;
50
51#define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */
52#define HV_MAX_MAX_DELTA_TICKS 0xffffffff
53#define HV_MIN_DELTA_TICKS 1
54
55/*
56 * hv_init - Main initialization routine.
57 *
58 * This routine must be called before any other routines in here are called
59 */
60int hv_init(void)
61{
62 hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
63 if (!hv_context.cpu_context)
64 return -ENOMEM;
65
66 direct_mode_enabled = ms_hyperv.misc_features &
67 HV_X64_STIMER_DIRECT_MODE_AVAILABLE;
68 return 0;
69}
70
71/*
72 * hv_post_message - Post a message using the hypervisor message IPC.
73 *
74 * This involves a hypercall.
75 */
76int hv_post_message(union hv_connection_id connection_id,
77 enum hv_message_type message_type,
78 void *payload, size_t payload_size)
79{
80 struct hv_input_post_message *aligned_msg;
81 struct hv_per_cpu_context *hv_cpu;
82 u64 status;
83
84 if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
85 return -EMSGSIZE;
86
87 hv_cpu = get_cpu_ptr(hv_context.cpu_context);
88 aligned_msg = hv_cpu->post_msg_page;
89 aligned_msg->connectionid = connection_id;
90 aligned_msg->reserved = 0;
91 aligned_msg->message_type = message_type;
92 aligned_msg->payload_size = payload_size;
93 memcpy((void *)aligned_msg->payload, payload, payload_size);
94
95 status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
96
97 /* Preemption must remain disabled until after the hypercall
98 * so some other thread can't get scheduled onto this cpu and
99 * corrupt the per-cpu post_msg_page
100 */
101 put_cpu_ptr(hv_cpu);
102
103 return status & 0xFFFF;
104}
105
106/*
107 * ISR for when stimer0 is operating in Direct Mode. Direct Mode
108 * does not use VMbus or any VMbus messages, so process here and not
109 * in the VMbus driver code.
110 */
111
112static void hv_stimer0_isr(void)
113{
114 struct hv_per_cpu_context *hv_cpu;
115
116 hv_cpu = this_cpu_ptr(hv_context.cpu_context);
117 hv_cpu->clk_evt->event_handler(hv_cpu->clk_evt);
118 add_interrupt_randomness(stimer0_vector, 0);
119}
120
121static int hv_ce_set_next_event(unsigned long delta,
122 struct clock_event_device *evt)
123{
124 u64 current_tick;
125
126 WARN_ON(!clockevent_state_oneshot(evt));
127
128 current_tick = hyperv_cs->read(NULL);
129 current_tick += delta;
130 hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
131 return 0;
132}
133
134static int hv_ce_shutdown(struct clock_event_device *evt)
135{
136 hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
137 hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);
138 if (direct_mode_enabled)
139 hv_disable_stimer0_percpu_irq(stimer0_irq);
140
141 return 0;
142}
143
144static int hv_ce_set_oneshot(struct clock_event_device *evt)
145{
146 union hv_timer_config timer_cfg;
147
148 timer_cfg.as_uint64 = 0;
149 timer_cfg.enable = 1;
150 timer_cfg.auto_enable = 1;
151 if (direct_mode_enabled) {
152 /*
153 * When it expires, the timer will directly interrupt
154 * on the specified hardware vector/IRQ.
155 */
156 timer_cfg.direct_mode = 1;
157 timer_cfg.apic_vector = stimer0_vector;
158 hv_enable_stimer0_percpu_irq(stimer0_irq);
159 } else {
160 /*
161 * When it expires, the timer will generate a VMbus message,
162 * to be handled by the normal VMbus interrupt handler.
163 */
164 timer_cfg.direct_mode = 0;
165 timer_cfg.sintx = VMBUS_MESSAGE_SINT;
166 }
167 hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
168 return 0;
169}
170
171static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
172{
173 dev->name = "Hyper-V clockevent";
174 dev->features = CLOCK_EVT_FEAT_ONESHOT;
175 dev->cpumask = cpumask_of(cpu);
176 dev->rating = 1000;
177 /*
178 * Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
179 * result in clockevents_config_and_register() taking additional
180 * references to the hv_vmbus module making it impossible to unload.
181 */
182
183 dev->set_state_shutdown = hv_ce_shutdown;
184 dev->set_state_oneshot = hv_ce_set_oneshot;
185 dev->set_next_event = hv_ce_set_next_event;
186}
187
188
189int hv_synic_alloc(void)
190{
191 int cpu;
192
193 hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
194 GFP_KERNEL);
195 if (hv_context.hv_numa_map == NULL) {
196 pr_err("Unable to allocate NUMA map\n");
197 goto err;
198 }
199
200 for_each_present_cpu(cpu) {
201 struct hv_per_cpu_context *hv_cpu
202 = per_cpu_ptr(hv_context.cpu_context, cpu);
203
204 memset(hv_cpu, 0, sizeof(*hv_cpu));
205 tasklet_init(&hv_cpu->msg_dpc,
206 vmbus_on_msg_dpc, (unsigned long) hv_cpu);
207
208 hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
209 GFP_KERNEL);
210 if (hv_cpu->clk_evt == NULL) {
211 pr_err("Unable to allocate clock event device\n");
212 goto err;
213 }
214 hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
215
216 hv_cpu->synic_message_page =
217 (void *)get_zeroed_page(GFP_ATOMIC);
218 if (hv_cpu->synic_message_page == NULL) {
219 pr_err("Unable to allocate SYNIC message page\n");
220 goto err;
221 }
222
223 hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
224 if (hv_cpu->synic_event_page == NULL) {
225 pr_err("Unable to allocate SYNIC event page\n");
226 goto err;
227 }
228
229 hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
230 if (hv_cpu->post_msg_page == NULL) {
231 pr_err("Unable to allocate post msg page\n");
232 goto err;
233 }
234
235 INIT_LIST_HEAD(&hv_cpu->chan_list);
236 }
237
238 if (direct_mode_enabled &&
239 hv_setup_stimer0_irq(&stimer0_irq, &stimer0_vector,
240 hv_stimer0_isr))
241 goto err;
242
243 return 0;
244err:
245 return -ENOMEM;
246}
247
248
249void hv_synic_free(void)
250{
251 int cpu;
252
253 for_each_present_cpu(cpu) {
254 struct hv_per_cpu_context *hv_cpu
255 = per_cpu_ptr(hv_context.cpu_context, cpu);
256
257 if (hv_cpu->synic_event_page)
258 free_page((unsigned long)hv_cpu->synic_event_page);
259 if (hv_cpu->synic_message_page)
260 free_page((unsigned long)hv_cpu->synic_message_page);
261 if (hv_cpu->post_msg_page)
262 free_page((unsigned long)hv_cpu->post_msg_page);
263 }
264
265 kfree(hv_context.hv_numa_map);
266}
267
268/*
269 * hv_synic_init - Initialize the Synthetic Interrupt Controller.
270 *
271 * If it is already initialized by another entity (ie x2v shim), we need to
272 * retrieve the initialized message and event pages. Otherwise, we create and
273 * initialize the message and event pages.
274 */
275int hv_synic_init(unsigned int cpu)
276{
277 struct hv_per_cpu_context *hv_cpu
278 = per_cpu_ptr(hv_context.cpu_context, cpu);
279 union hv_synic_simp simp;
280 union hv_synic_siefp siefp;
281 union hv_synic_sint shared_sint;
282 union hv_synic_scontrol sctrl;
283
284 /* Setup the Synic's message page */
285 hv_get_simp(simp.as_uint64);
286 simp.simp_enabled = 1;
287 simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
288 >> PAGE_SHIFT;
289
290 hv_set_simp(simp.as_uint64);
291
292 /* Setup the Synic's event page */
293 hv_get_siefp(siefp.as_uint64);
294 siefp.siefp_enabled = 1;
295 siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
296 >> PAGE_SHIFT;
297
298 hv_set_siefp(siefp.as_uint64);
299
300 /* Setup the shared SINT. */
301 hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
302 shared_sint.as_uint64);
303
304 shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
305 shared_sint.masked = false;
306 if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
307 shared_sint.auto_eoi = false;
308 else
309 shared_sint.auto_eoi = true;
310
311 hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
312 shared_sint.as_uint64);
313
314 /* Enable the global synic bit */
315 hv_get_synic_state(sctrl.as_uint64);
316 sctrl.enable = 1;
317
318 hv_set_synic_state(sctrl.as_uint64);
319
320 hv_context.synic_initialized = true;
321
322 /*
323 * Register the per-cpu clockevent source.
324 */
325 if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
326 clockevents_config_and_register(hv_cpu->clk_evt,
327 HV_TIMER_FREQUENCY,
328 HV_MIN_DELTA_TICKS,
329 HV_MAX_MAX_DELTA_TICKS);
330 return 0;
331}
332
333/*
334 * hv_synic_clockevents_cleanup - Cleanup clockevent devices
335 */
336void hv_synic_clockevents_cleanup(void)
337{
338 int cpu;
339
340 if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
341 return;
342
343 if (direct_mode_enabled)
344 hv_remove_stimer0_irq(stimer0_irq);
345
346 for_each_present_cpu(cpu) {
347 struct hv_per_cpu_context *hv_cpu
348 = per_cpu_ptr(hv_context.cpu_context, cpu);
349
350 clockevents_unbind_device(hv_cpu->clk_evt, cpu);
351 }
352}
353
354/*
355 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
356 */
357int hv_synic_cleanup(unsigned int cpu)
358{
359 union hv_synic_sint shared_sint;
360 union hv_synic_simp simp;
361 union hv_synic_siefp siefp;
362 union hv_synic_scontrol sctrl;
363 struct vmbus_channel *channel, *sc;
364 bool channel_found = false;
365 unsigned long flags;
366
367 if (!hv_context.synic_initialized)
368 return -EFAULT;
369
370 /*
371 * Search for channels which are bound to the CPU we're about to
372 * cleanup. In case we find one and vmbus is still connected we need to
373 * fail, this will effectively prevent CPU offlining. There is no way
374 * we can re-bind channels to different CPUs for now.
375 */
376 mutex_lock(&vmbus_connection.channel_mutex);
377 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
378 if (channel->target_cpu == cpu) {
379 channel_found = true;
380 break;
381 }
382 spin_lock_irqsave(&channel->lock, flags);
383 list_for_each_entry(sc, &channel->sc_list, sc_list) {
384 if (sc->target_cpu == cpu) {
385 channel_found = true;
386 break;
387 }
388 }
389 spin_unlock_irqrestore(&channel->lock, flags);
390 if (channel_found)
391 break;
392 }
393 mutex_unlock(&vmbus_connection.channel_mutex);
394
395 if (channel_found && vmbus_connection.conn_state == CONNECTED)
396 return -EBUSY;
397
398 /* Turn off clockevent device */
399 if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
400 struct hv_per_cpu_context *hv_cpu
401 = this_cpu_ptr(hv_context.cpu_context);
402
403 clockevents_unbind_device(hv_cpu->clk_evt, cpu);
404 hv_ce_shutdown(hv_cpu->clk_evt);
405 put_cpu_ptr(hv_cpu);
406 }
407
408 hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
409 shared_sint.as_uint64);
410
411 shared_sint.masked = 1;
412
413 /* Need to correctly cleanup in the case of SMP!!! */
414 /* Disable the interrupt */
415 hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
416 shared_sint.as_uint64);
417
418 hv_get_simp(simp.as_uint64);
419 simp.simp_enabled = 0;
420 simp.base_simp_gpa = 0;
421
422 hv_set_simp(simp.as_uint64);
423
424 hv_get_siefp(siefp.as_uint64);
425 siefp.siefp_enabled = 0;
426 siefp.base_siefp_gpa = 0;
427
428 hv_set_siefp(siefp.as_uint64);
429
430 /* Disable the global synic bit */
431 hv_get_synic_state(sctrl.as_uint64);
432 sctrl.enable = 0;
433 hv_set_synic_state(sctrl.as_uint64);
434
435 return 0;
436}