|
@@ -0,0 +1,553 @@
|
|
1
|
+/*
|
|
2
|
+ * Copyright (C) 2014 Michael Brown <mbrown@fensystems.co.uk>.
|
|
3
|
+ *
|
|
4
|
+ * This program is free software; you can redistribute it and/or
|
|
5
|
+ * modify it under the terms of the GNU General Public License as
|
|
6
|
+ * published by the Free Software Foundation; either version 2 of the
|
|
7
|
+ * License, or (at your option) any later version.
|
|
8
|
+ *
|
|
9
|
+ * This program is distributed in the hope that it will be useful, but
|
|
10
|
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
11
|
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
12
|
+ * General Public License for more details.
|
|
13
|
+ *
|
|
14
|
+ * You should have received a copy of the GNU General Public License
|
|
15
|
+ * along with this program; if not, write to the Free Software
|
|
16
|
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
17
|
+ * 02110-1301, USA.
|
|
18
|
+ */
|
|
19
|
+
|
|
20
|
+FILE_LICENCE ( GPL2_OR_LATER );
|
|
21
|
+
|
|
22
|
+/** @file
|
|
23
|
+ *
|
|
24
|
+ * Hyper-V driver
|
|
25
|
+ *
|
|
26
|
+ */
|
|
27
|
+
|
|
28
|
+#include <stdlib.h>
|
|
29
|
+#include <stdarg.h>
|
|
30
|
+#include <string.h>
|
|
31
|
+#include <unistd.h>
|
|
32
|
+#include <assert.h>
|
|
33
|
+#include <errno.h>
|
|
34
|
+#include <byteswap.h>
|
|
35
|
+#include <pic8259.h>
|
|
36
|
+#include <ipxe/malloc.h>
|
|
37
|
+#include <ipxe/device.h>
|
|
38
|
+#include <ipxe/cpuid.h>
|
|
39
|
+#include <ipxe/msr.h>
|
|
40
|
+#include <ipxe/hyperv.h>
|
|
41
|
+#include "hyperv.h"
|
|
42
|
+
|
|
43
|
+/** Maximum time to wait for a message response
|
|
44
|
+ *
|
|
45
|
+ * This is a policy decision.
|
|
46
|
+ */
|
|
47
|
+#define HV_MESSAGE_MAX_WAIT_MS 1000
|
|
48
|
+
|
|
49
|
+/**
|
|
50
|
+ * Convert a Hyper-V status code to an iPXE status code
|
|
51
|
+ *
|
|
52
|
+ * @v status Hyper-V status code
|
|
53
|
+ * @ret rc iPXE status code (before negation)
|
|
54
|
+ */
|
|
55
|
+#define EHV( status ) EPLATFORM ( EINFO_EPLATFORM, (status) )
|
|
56
|
+
|
|
57
|
+/**
|
|
58
|
+ * Allocate zeroed pages
|
|
59
|
+ *
|
|
60
|
+ * @v hv Hyper-V hypervisor
|
|
61
|
+ * @v ... Page addresses to fill in, terminated by NULL
|
|
62
|
+ * @ret rc Return status code
|
|
63
|
+ */
|
|
64
|
+__attribute__ (( sentinel )) int
|
|
65
|
+hv_alloc_pages ( struct hv_hypervisor *hv, ... ) {
|
|
66
|
+ va_list args;
|
|
67
|
+ void **page;
|
|
68
|
+ int i;
|
|
69
|
+
|
|
70
|
+ /* Allocate and zero pages */
|
|
71
|
+ va_start ( args, hv );
|
|
72
|
+ for ( i = 0 ; ( ( page = va_arg ( args, void ** ) ) != NULL ); i++ ) {
|
|
73
|
+ *page = malloc_dma ( PAGE_SIZE, PAGE_SIZE );
|
|
74
|
+ if ( ! *page )
|
|
75
|
+ goto err_alloc;
|
|
76
|
+ memset ( *page, 0, PAGE_SIZE );
|
|
77
|
+ }
|
|
78
|
+ va_end ( args );
|
|
79
|
+
|
|
80
|
+ return 0;
|
|
81
|
+
|
|
82
|
+ err_alloc:
|
|
83
|
+ va_end ( args );
|
|
84
|
+ va_start ( args, hv );
|
|
85
|
+ for ( ; i >= 0 ; i-- ) {
|
|
86
|
+ page = va_arg ( args, void ** );
|
|
87
|
+ free_dma ( *page, PAGE_SIZE );
|
|
88
|
+ }
|
|
89
|
+ va_end ( args );
|
|
90
|
+ return -ENOMEM;
|
|
91
|
+}
|
|
92
|
+
|
|
93
|
+/**
|
|
94
|
+ * Free pages
|
|
95
|
+ *
|
|
96
|
+ * @v hv Hyper-V hypervisor
|
|
97
|
+ * @v ... Page addresses, terminated by NULL
|
|
98
|
+ */
|
|
99
|
+__attribute__ (( sentinel )) void
|
|
100
|
+hv_free_pages ( struct hv_hypervisor *hv, ... ) {
|
|
101
|
+ va_list args;
|
|
102
|
+ void *page;
|
|
103
|
+
|
|
104
|
+ va_start ( args, hv );
|
|
105
|
+ while ( ( page = va_arg ( args, void * ) ) != NULL )
|
|
106
|
+ free_dma ( page, PAGE_SIZE );
|
|
107
|
+ va_end ( args );
|
|
108
|
+}
|
|
109
|
+
|
|
110
|
+/**
|
|
111
|
+ * Allocate message buffer
|
|
112
|
+ *
|
|
113
|
+ * @v hv Hyper-V hypervisor
|
|
114
|
+ * @ret rc Return status code
|
|
115
|
+ */
|
|
116
|
+static int hv_alloc_message ( struct hv_hypervisor *hv ) {
|
|
117
|
+
|
|
118
|
+ /* Allocate buffer. Must be aligned to at least 8 bytes and
|
|
119
|
+ * must not cross a page boundary, so align on its own size.
|
|
120
|
+ */
|
|
121
|
+ hv->message = malloc_dma ( sizeof ( *hv->message ),
|
|
122
|
+ sizeof ( *hv->message ) );
|
|
123
|
+ if ( ! hv->message )
|
|
124
|
+ return -ENOMEM;
|
|
125
|
+
|
|
126
|
+ return 0;
|
|
127
|
+}
|
|
128
|
+
|
|
129
|
+/**
|
|
130
|
+ * Free message buffer
|
|
131
|
+ *
|
|
132
|
+ * @v hv Hyper-V hypervisor
|
|
133
|
+ */
|
|
134
|
+static void hv_free_message ( struct hv_hypervisor *hv ) {
|
|
135
|
+
|
|
136
|
+ /* Free buffer */
|
|
137
|
+ free_dma ( hv->message, sizeof ( *hv->message ) );
|
|
138
|
+}
|
|
139
|
+
|
|
140
|
+/**
|
|
141
|
+ * Check whether or not we are running in Hyper-V
|
|
142
|
+ *
|
|
143
|
+ * @v hv Hyper-V hypervisor
|
|
144
|
+ * @ret rc Return status code
|
|
145
|
+ */
|
|
146
|
+static int hv_check_hv ( struct hv_hypervisor *hv ) {
|
|
147
|
+ struct x86_features features;
|
|
148
|
+ uint32_t interface_id;
|
|
149
|
+ uint32_t discard_ebx;
|
|
150
|
+ uint32_t discard_ecx;
|
|
151
|
+ uint32_t discard_edx;
|
|
152
|
+
|
|
153
|
+ /* Check for presence of a hypervisor (not necessarily Hyper-V) */
|
|
154
|
+ x86_features ( &features );
|
|
155
|
+ if ( ! ( features.intel.ecx & CPUID_FEATURES_INTEL_ECX_HYPERVISOR ) ) {
|
|
156
|
+ DBGC ( hv, "HV %p not running in a hypervisor\n", hv );
|
|
157
|
+ return -ENODEV;
|
|
158
|
+ }
|
|
159
|
+
|
|
160
|
+ /* Check that hypervisor is Hyper-V */
|
|
161
|
+ cpuid ( HV_CPUID_INTERFACE_ID, &interface_id, &discard_ebx,
|
|
162
|
+ &discard_ecx, &discard_edx );
|
|
163
|
+ if ( interface_id != HV_INTERFACE_ID ) {
|
|
164
|
+ DBGC ( hv, "HV %p not running in Hyper-V (interface ID "
|
|
165
|
+ "%#08x)\n", hv, interface_id );
|
|
166
|
+ return -ENODEV;
|
|
167
|
+ }
|
|
168
|
+
|
|
169
|
+ return 0;
|
|
170
|
+}
|
|
171
|
+
|
|
172
|
+/**
|
|
173
|
+ * Map hypercall page
|
|
174
|
+ *
|
|
175
|
+ * @v hv Hyper-V hypervisor
|
|
176
|
+ * @ret rc Return status code
|
|
177
|
+ */
|
|
178
|
+static int hv_map_hypercall ( struct hv_hypervisor *hv ) {
|
|
179
|
+ union {
|
|
180
|
+ struct {
|
|
181
|
+ uint32_t ebx;
|
|
182
|
+ uint32_t ecx;
|
|
183
|
+ uint32_t edx;
|
|
184
|
+ } __attribute__ (( packed ));
|
|
185
|
+ char text[ 13 /* "bbbbccccdddd" + NUL */ ];
|
|
186
|
+ } vendor_id;
|
|
187
|
+ uint32_t build;
|
|
188
|
+ uint32_t version;
|
|
189
|
+ uint32_t discard_eax;
|
|
190
|
+ uint32_t discard_ecx;
|
|
191
|
+ uint32_t discard_edx;
|
|
192
|
+ uint64_t guest_os_id;
|
|
193
|
+ uint64_t hypercall;
|
|
194
|
+
|
|
195
|
+ /* Report guest OS identity */
|
|
196
|
+ guest_os_id = rdmsr ( HV_X64_MSR_GUEST_OS_ID );
|
|
197
|
+ if ( guest_os_id != 0 ) {
|
|
198
|
+ DBGC ( hv, "HV %p guest OS ID MSR already set to %#08llx\n",
|
|
199
|
+ hv, guest_os_id );
|
|
200
|
+ return -EBUSY;
|
|
201
|
+ }
|
|
202
|
+ guest_os_id = HV_GUEST_OS_ID_IPXE;
|
|
203
|
+ DBGC2 ( hv, "HV %p guest OS ID MSR is %#08llx\n", hv, guest_os_id );
|
|
204
|
+ wrmsr ( HV_X64_MSR_GUEST_OS_ID, guest_os_id );
|
|
205
|
+
|
|
206
|
+ /* Get hypervisor system identity (for debugging) */
|
|
207
|
+ cpuid ( HV_CPUID_VENDOR_ID, &discard_eax, &vendor_id.ebx,
|
|
208
|
+ &vendor_id.ecx, &vendor_id.edx );
|
|
209
|
+ vendor_id.text[ sizeof ( vendor_id.text ) - 1 ] = '\0';
|
|
210
|
+ cpuid ( HV_CPUID_HYPERVISOR_ID, &build, &version, &discard_ecx,
|
|
211
|
+ &discard_edx );
|
|
212
|
+ DBGC ( hv, "HV %p detected \"%s\" version %d.%d build %d\n", hv,
|
|
213
|
+ vendor_id.text, ( version >> 16 ), ( version & 0xffff ), build );
|
|
214
|
+
|
|
215
|
+ /* Map hypercall page */
|
|
216
|
+ hypercall = rdmsr ( HV_X64_MSR_HYPERCALL );
|
|
217
|
+ hypercall &= ( PAGE_SIZE - 1 );
|
|
218
|
+ hypercall |= ( virt_to_phys ( hv->hypercall ) | HV_HYPERCALL_ENABLE );
|
|
219
|
+ DBGC2 ( hv, "HV %p hypercall MSR is %#08llx\n", hv, hypercall );
|
|
220
|
+ wrmsr ( HV_X64_MSR_HYPERCALL, hypercall );
|
|
221
|
+
|
|
222
|
+ return 0;
|
|
223
|
+}
|
|
224
|
+
|
|
225
|
+/**
|
|
226
|
+ * Unmap hypercall page
|
|
227
|
+ *
|
|
228
|
+ * @v hv Hyper-V hypervisor
|
|
229
|
+ */
|
|
230
|
+static void hv_unmap_hypercall ( struct hv_hypervisor *hv ) {
|
|
231
|
+ uint64_t hypercall;
|
|
232
|
+ uint64_t guest_os_id;
|
|
233
|
+
|
|
234
|
+ /* Unmap the hypercall page */
|
|
235
|
+ hypercall = rdmsr ( HV_X64_MSR_HYPERCALL );
|
|
236
|
+ hypercall &= ( ( PAGE_SIZE - 1 ) & ~HV_HYPERCALL_ENABLE );
|
|
237
|
+ DBGC2 ( hv, "HV %p hypercall MSR is %#08llx\n", hv, hypercall );
|
|
238
|
+ wrmsr ( HV_X64_MSR_HYPERCALL, hypercall );
|
|
239
|
+
|
|
240
|
+ /* Reset the guest OS identity */
|
|
241
|
+ guest_os_id = 0;
|
|
242
|
+ DBGC2 ( hv, "HV %p guest OS ID MSR is %#08llx\n", hv, guest_os_id );
|
|
243
|
+ wrmsr ( HV_X64_MSR_GUEST_OS_ID, guest_os_id );
|
|
244
|
+}
|
|
245
|
+
|
|
246
|
+/**
|
|
247
|
+ * Map synthetic interrupt controller
|
|
248
|
+ *
|
|
249
|
+ * @v hv Hyper-V hypervisor
|
|
250
|
+ * @ret rc Return status code
|
|
251
|
+ */
|
|
252
|
+static int hv_map_synic ( struct hv_hypervisor *hv ) {
|
|
253
|
+ uint64_t simp;
|
|
254
|
+ uint64_t siefp;
|
|
255
|
+ uint64_t scontrol;
|
|
256
|
+
|
|
257
|
+ /* Map SynIC message page */
|
|
258
|
+ simp = rdmsr ( HV_X64_MSR_SIMP );
|
|
259
|
+ simp &= ( PAGE_SIZE - 1 );
|
|
260
|
+ simp |= ( virt_to_phys ( hv->synic.message ) | HV_SIMP_ENABLE );
|
|
261
|
+ DBGC2 ( hv, "HV %p SIMP MSR is %#08llx\n", hv, simp );
|
|
262
|
+ wrmsr ( HV_X64_MSR_SIMP, simp );
|
|
263
|
+
|
|
264
|
+ /* Map SynIC event page */
|
|
265
|
+ siefp = rdmsr ( HV_X64_MSR_SIEFP );
|
|
266
|
+ siefp &= ( PAGE_SIZE - 1 );
|
|
267
|
+ siefp |= ( virt_to_phys ( hv->synic.event ) | HV_SIEFP_ENABLE );
|
|
268
|
+ DBGC2 ( hv, "HV %p SIEFP MSR is %#08llx\n", hv, siefp );
|
|
269
|
+ wrmsr ( HV_X64_MSR_SIEFP, siefp );
|
|
270
|
+
|
|
271
|
+ /* Enable SynIC */
|
|
272
|
+ scontrol = rdmsr ( HV_X64_MSR_SCONTROL );
|
|
273
|
+ scontrol |= HV_SCONTROL_ENABLE;
|
|
274
|
+ DBGC2 ( hv, "HV %p SCONTROL MSR is %#08llx\n", hv, scontrol );
|
|
275
|
+ wrmsr ( HV_X64_MSR_SCONTROL, scontrol );
|
|
276
|
+
|
|
277
|
+ return 0;
|
|
278
|
+}
|
|
279
|
+
|
|
280
|
+/**
|
|
281
|
+ * Unmap synthetic interrupt controller
|
|
282
|
+ *
|
|
283
|
+ * @v hv Hyper-V hypervisor
|
|
284
|
+ */
|
|
285
|
+static void hv_unmap_synic ( struct hv_hypervisor *hv ) {
|
|
286
|
+ uint64_t scontrol;
|
|
287
|
+ uint64_t siefp;
|
|
288
|
+ uint64_t simp;
|
|
289
|
+
|
|
290
|
+ /* Disable SynIC */
|
|
291
|
+ scontrol = rdmsr ( HV_X64_MSR_SCONTROL );
|
|
292
|
+ scontrol &= ~HV_SCONTROL_ENABLE;
|
|
293
|
+ DBGC2 ( hv, "HV %p SCONTROL MSR is %#08llx\n", hv, scontrol );
|
|
294
|
+ wrmsr ( HV_X64_MSR_SCONTROL, scontrol );
|
|
295
|
+
|
|
296
|
+ /* Unmap SynIC event page */
|
|
297
|
+ siefp = rdmsr ( HV_X64_MSR_SIEFP );
|
|
298
|
+ siefp &= ( ( PAGE_SIZE - 1 ) & ~HV_SIEFP_ENABLE );
|
|
299
|
+ DBGC2 ( hv, "HV %p SIEFP MSR is %#08llx\n", hv, siefp );
|
|
300
|
+ wrmsr ( HV_X64_MSR_SIEFP, siefp );
|
|
301
|
+
|
|
302
|
+ /* Unmap SynIC message page */
|
|
303
|
+ simp = rdmsr ( HV_X64_MSR_SIMP );
|
|
304
|
+ simp &= ( ( PAGE_SIZE - 1 ) & ~HV_SIMP_ENABLE );
|
|
305
|
+ DBGC2 ( hv, "HV %p SIMP MSR is %#08llx\n", hv, simp );
|
|
306
|
+ wrmsr ( HV_X64_MSR_SIMP, simp );
|
|
307
|
+}
|
|
308
|
+
|
|
309
|
+/**
|
|
310
|
+ * Enable synthetic interrupt
|
|
311
|
+ *
|
|
312
|
+ * @v hv Hyper-V hypervisor
|
|
313
|
+ * @v sintx Synthetic interrupt number
|
|
314
|
+ */
|
|
315
|
+void hv_enable_sint ( struct hv_hypervisor *hv, unsigned int sintx ) {
|
|
316
|
+ unsigned long msr = HV_X64_MSR_SINT ( sintx );
|
|
317
|
+ uint64_t sint;
|
|
318
|
+
|
|
319
|
+ /* Enable synthetic interrupt
|
|
320
|
+ *
|
|
321
|
+ * We have to enable the interrupt, otherwise messages will
|
|
322
|
+ * not be delivered (even though the documentation implies
|
|
323
|
+ * that polling for messages is possible). We enable AutoEOI
|
|
324
|
+ * and hook the interrupt to the obsolete IRQ13 (FPU
|
|
325
|
+ * exception) vector, which will be implemented as a no-op.
|
|
326
|
+ */
|
|
327
|
+ sint = rdmsr ( msr );
|
|
328
|
+ sint &= ~( HV_SINT_MASKED | HV_SINT_VECTOR_MASK );
|
|
329
|
+ sint |= ( HV_SINT_AUTO_EOI |
|
|
330
|
+ HV_SINT_VECTOR ( IRQ_INT ( 13 /* See comment above */ ) ) );
|
|
331
|
+ DBGC2 ( hv, "HV %p SINT%d MSR is %#08llx\n", hv, sintx, sint );
|
|
332
|
+ wrmsr ( msr, sint );
|
|
333
|
+}
|
|
334
|
+
|
|
335
|
+/**
|
|
336
|
+ * Disable synthetic interrupt
|
|
337
|
+ *
|
|
338
|
+ * @v hv Hyper-V hypervisor
|
|
339
|
+ * @v sintx Synthetic interrupt number
|
|
340
|
+ */
|
|
341
|
+void hv_disable_sint ( struct hv_hypervisor *hv, unsigned int sintx ) {
|
|
342
|
+ unsigned long msr = HV_X64_MSR_SINT ( sintx );
|
|
343
|
+ uint64_t sint;
|
|
344
|
+
|
|
345
|
+ /* Disable synthetic interrupt */
|
|
346
|
+ sint = rdmsr ( msr );
|
|
347
|
+ sint &= ~HV_SINT_AUTO_EOI;
|
|
348
|
+ sint |= HV_SINT_MASKED;
|
|
349
|
+ DBGC2 ( hv, "HV %p SINT%d MSR is %#08llx\n", hv, sintx, sint );
|
|
350
|
+ wrmsr ( msr, sint );
|
|
351
|
+}
|
|
352
|
+
|
|
353
|
+/**
|
|
354
|
+ * Post message
|
|
355
|
+ *
|
|
356
|
+ * @v hv Hyper-V hypervisor
|
|
357
|
+ * @v id Connection ID
|
|
358
|
+ * @v type Message type
|
|
359
|
+ * @v data Message
|
|
360
|
+ * @v len Length of message
|
|
361
|
+ * @ret rc Return status code
|
|
362
|
+ */
|
|
363
|
+int hv_post_message ( struct hv_hypervisor *hv, unsigned int id,
|
|
364
|
+ unsigned int type, const void *data, size_t len ) {
|
|
365
|
+ struct hv_post_message *msg = &hv->message->posted;
|
|
366
|
+ int status;
|
|
367
|
+ int rc;
|
|
368
|
+
|
|
369
|
+ /* Sanity check */
|
|
370
|
+ assert ( len <= sizeof ( msg->data ) );
|
|
371
|
+
|
|
372
|
+ /* Construct message */
|
|
373
|
+ memset ( msg, 0, sizeof ( *msg ) );
|
|
374
|
+ msg->id = cpu_to_le32 ( id );
|
|
375
|
+ msg->type = cpu_to_le32 ( type );
|
|
376
|
+ msg->len = cpu_to_le32 ( len );
|
|
377
|
+ memcpy ( msg->data, data, len );
|
|
378
|
+ DBGC2 ( hv, "HV %p connection %d posting message type %#08x:\n",
|
|
379
|
+ hv, id, type );
|
|
380
|
+ DBGC2_HDA ( hv, 0, msg->data, len );
|
|
381
|
+
|
|
382
|
+ /* Post message */
|
|
383
|
+ if ( ( status = hv_call ( hv, HV_POST_MESSAGE, msg, NULL ) ) != 0 ) {
|
|
384
|
+ rc = -EHV ( status );
|
|
385
|
+ DBGC ( hv, "HV %p could not post message to %#08x: %s\n",
|
|
386
|
+ hv, id, strerror ( rc ) );
|
|
387
|
+ return rc;
|
|
388
|
+ }
|
|
389
|
+
|
|
390
|
+ return 0;
|
|
391
|
+}
|
|
392
|
+
|
|
393
|
+/**
|
|
394
|
+ * Wait for received message
|
|
395
|
+ *
|
|
396
|
+ * @v hv Hyper-V hypervisor
|
|
397
|
+ * @v sintx Synthetic interrupt number
|
|
398
|
+ * @ret rc Return status code
|
|
399
|
+ */
|
|
400
|
+int hv_wait_for_message ( struct hv_hypervisor *hv, unsigned int sintx ) {
|
|
401
|
+ struct hv_message *msg = &hv->message->received;
|
|
402
|
+ struct hv_message *src = &hv->synic.message[sintx];
|
|
403
|
+ unsigned int retries;
|
|
404
|
+ size_t len;
|
|
405
|
+
|
|
406
|
+ /* Wait for message to arrive */
|
|
407
|
+ for ( retries = 0 ; retries < HV_MESSAGE_MAX_WAIT_MS ; retries++ ) {
|
|
408
|
+
|
|
409
|
+ /* Check for message */
|
|
410
|
+ if ( src->type ) {
|
|
411
|
+
|
|
412
|
+ /* Copy message */
|
|
413
|
+ memset ( msg, 0, sizeof ( *msg ) );
|
|
414
|
+ len = src->len;
|
|
415
|
+ assert ( len <= sizeof ( *msg ) );
|
|
416
|
+ memcpy ( msg, src,
|
|
417
|
+ ( offsetof ( typeof ( *msg ), data ) + len ) );
|
|
418
|
+ DBGC2 ( hv, "HV %p SINT%d received message type "
|
|
419
|
+ "%#08x:\n", hv, sintx,
|
|
420
|
+ le32_to_cpu ( msg->type ) );
|
|
421
|
+ DBGC2_HDA ( hv, 0, msg->data, len );
|
|
422
|
+
|
|
423
|
+ /* Consume message */
|
|
424
|
+ src->type = 0;
|
|
425
|
+
|
|
426
|
+ return 0;
|
|
427
|
+ }
|
|
428
|
+
|
|
429
|
+ /* Trigger message delivery */
|
|
430
|
+ wrmsr ( HV_X64_MSR_EOM, 0 );
|
|
431
|
+
|
|
432
|
+ /* Delay */
|
|
433
|
+ mdelay ( 1 );
|
|
434
|
+ }
|
|
435
|
+
|
|
436
|
+ DBGC ( hv, "HV %p SINT%d timed out waiting for message\n",
|
|
437
|
+ hv, sintx );
|
|
438
|
+ return -ETIMEDOUT;
|
|
439
|
+}
|
|
440
|
+
|
|
441
|
+/**
|
|
442
|
+ * Signal event
|
|
443
|
+ *
|
|
444
|
+ * @v hv Hyper-V hypervisor
|
|
445
|
+ * @v id Connection ID
|
|
446
|
+ * @v flag Flag number
|
|
447
|
+ * @ret rc Return status code
|
|
448
|
+ */
|
|
449
|
+int hv_signal_event ( struct hv_hypervisor *hv, unsigned int id,
|
|
450
|
+ unsigned int flag ) {
|
|
451
|
+ struct hv_signal_event *event = &hv->message->signalled;
|
|
452
|
+ int status;
|
|
453
|
+ int rc;
|
|
454
|
+
|
|
455
|
+ /* Construct event */
|
|
456
|
+ memset ( event, 0, sizeof ( *event ) );
|
|
457
|
+ event->id = cpu_to_le32 ( id );
|
|
458
|
+ event->flag = cpu_to_le16 ( flag );
|
|
459
|
+
|
|
460
|
+ /* Signal event */
|
|
461
|
+ if ( ( status = hv_call ( hv, HV_SIGNAL_EVENT, event, NULL ) ) != 0 ) {
|
|
462
|
+ rc = -EHV ( status );
|
|
463
|
+ DBGC ( hv, "HV %p could not signal event to %#08x: %s\n",
|
|
464
|
+ hv, id, strerror ( rc ) );
|
|
465
|
+ return rc;
|
|
466
|
+ }
|
|
467
|
+
|
|
468
|
+ return 0;
|
|
469
|
+}
|
|
470
|
+
|
|
471
|
+/**
|
|
472
|
+ * Probe root device
|
|
473
|
+ *
|
|
474
|
+ * @v rootdev Root device
|
|
475
|
+ * @ret rc Return status code
|
|
476
|
+ */
|
|
477
|
+static int hv_probe ( struct root_device *rootdev ) {
|
|
478
|
+ struct hv_hypervisor *hv;
|
|
479
|
+ int rc;
|
|
480
|
+
|
|
481
|
+ /* Allocate and initialise structure */
|
|
482
|
+ hv = zalloc ( sizeof ( *hv ) );
|
|
483
|
+ if ( ! hv ) {
|
|
484
|
+ rc = -ENOMEM;
|
|
485
|
+ goto err_alloc;
|
|
486
|
+ }
|
|
487
|
+
|
|
488
|
+ /* Check we are running in Hyper-V */
|
|
489
|
+ if ( ( rc = hv_check_hv ( hv ) ) != 0 )
|
|
490
|
+ goto err_check_hv;
|
|
491
|
+
|
|
492
|
+ /* Allocate pages */
|
|
493
|
+ if ( ( rc = hv_alloc_pages ( hv, &hv->hypercall, &hv->synic.message,
|
|
494
|
+ &hv->synic.event, NULL ) ) != 0 )
|
|
495
|
+ goto err_alloc_pages;
|
|
496
|
+
|
|
497
|
+ /* Allocate message buffer */
|
|
498
|
+ if ( ( rc = hv_alloc_message ( hv ) ) != 0 )
|
|
499
|
+ goto err_alloc_message;
|
|
500
|
+
|
|
501
|
+ /* Map hypercall page */
|
|
502
|
+ if ( ( rc = hv_map_hypercall ( hv ) ) != 0 )
|
|
503
|
+ goto err_map_hypercall;
|
|
504
|
+
|
|
505
|
+ /* Map synthetic interrupt controller */
|
|
506
|
+ if ( ( rc = hv_map_synic ( hv ) ) != 0 )
|
|
507
|
+ goto err_map_synic;
|
|
508
|
+
|
|
509
|
+ rootdev_set_drvdata ( rootdev, hv );
|
|
510
|
+ return 0;
|
|
511
|
+
|
|
512
|
+ hv_unmap_synic ( hv );
|
|
513
|
+ err_map_synic:
|
|
514
|
+ hv_unmap_hypercall ( hv );
|
|
515
|
+ err_map_hypercall:
|
|
516
|
+ hv_free_message ( hv );
|
|
517
|
+ err_alloc_message:
|
|
518
|
+ hv_free_pages ( hv, hv->hypercall, hv->synic.message, hv->synic.event,
|
|
519
|
+ NULL );
|
|
520
|
+ err_alloc_pages:
|
|
521
|
+ err_check_hv:
|
|
522
|
+ free ( hv );
|
|
523
|
+ err_alloc:
|
|
524
|
+ return rc;
|
|
525
|
+}
|
|
526
|
+
|
|
527
|
+/**
|
|
528
|
+ * Remove root device
|
|
529
|
+ *
|
|
530
|
+ * @v rootdev Root device
|
|
531
|
+ */
|
|
532
|
+static void hv_remove ( struct root_device *rootdev ) {
|
|
533
|
+ struct hv_hypervisor *hv = rootdev_get_drvdata ( rootdev );
|
|
534
|
+
|
|
535
|
+ hv_unmap_synic ( hv );
|
|
536
|
+ hv_unmap_hypercall ( hv );
|
|
537
|
+ hv_free_message ( hv );
|
|
538
|
+ hv_free_pages ( hv, hv->hypercall, hv->synic.message, hv->synic.event,
|
|
539
|
+ NULL );
|
|
540
|
+ free ( hv );
|
|
541
|
+}
|
|
542
|
+
|
|
543
|
+/** Hyper-V root device driver */
|
|
544
|
+static struct root_driver hv_root_driver = {
|
|
545
|
+ .probe = hv_probe,
|
|
546
|
+ .remove = hv_remove,
|
|
547
|
+};
|
|
548
|
+
|
|
549
|
+/** Hyper-V root device */
|
|
550
|
+struct root_device hv_root_device __root_device = {
|
|
551
|
+ .dev = { .name = "Hyper-V" },
|
|
552
|
+ .driver = &hv_root_driver,
|
|
553
|
+};
|