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re #13140 rb4270 hvm_sd module missing dependencies on scsi and cmlb
re #13166 rb4270 Check for Xen HVM even if CPUID signature returns Microsoft Hv
re #13187 rb4270 Fix Xen HVM related warnings
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--- old/usr/src/uts/i86pc/os/xpv_platform.c
+++ new/usr/src/uts/i86pc/os/xpv_platform.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 */
24 24
25 25 #include <sys/types.h>
26 26 #include <sys/archsystm.h>
27 27 #include <sys/machsystm.h>
28 28 #include <sys/sunndi.h>
29 29 #include <sys/sunddi.h>
30 30 #include <sys/ddi_subrdefs.h>
31 31 #include <sys/xpv_support.h>
32 32 #include <sys/xen_errno.h>
33 33 #include <sys/hypervisor.h>
34 34 #include <sys/gnttab.h>
35 35 #include <sys/xenbus_comms.h>
36 36 #include <sys/xenbus_impl.h>
37 37 #include <sys/sysmacros.h>
38 38 #include <sys/x86_archext.h>
39 39 #include <sys/mman.h>
40 40 #include <sys/stat.h>
41 41 #include <sys/conf.h>
42 42 #include <sys/devops.h>
43 43 #include <sys/pc_mmu.h>
44 44 #include <sys/cmn_err.h>
45 45 #include <sys/cpr.h>
46 46 #include <sys/ddi.h>
47 47 #include <vm/seg_kmem.h>
48 48 #include <vm/as.h>
49 49 #include <vm/hat_pte.h>
50 50 #include <vm/hat_i86.h>
51 51
52 52 static int xen_hvm_inited;
53 53
54 54 /*
55 55 * This structure is ordinarily constructed by Xen. In the HVM world, we
56 56 * manually fill in the few fields the PV drivers need.
57 57 */
58 58 static start_info_t __xen_info;
59 59 start_info_t *xen_info = NULL;
60 60
61 61 static int xen_bits = -1;
62 62 static int xen_major = -1, xen_minor = -1;
63 63
64 64 /*
65 65 * Feature bits; more bits will be added, like direct I/O, etc.
66 66 */
67 67 #define XEN_HVM_HYPERCALLS 0x0001
68 68 #define XEN_HVM_TLBFLUSH 0x0002
69 69 static uint64_t xen_hvm_features;
70 70
71 71 /* Metadata page shared between domain and Xen */
72 72 shared_info_t *HYPERVISOR_shared_info = NULL;
73 73 pfn_t xen_shared_info_frame;
74 74
75 75 /* Page containing code to issue hypercalls. */
76 76 extern caddr_t hypercall_page;
77 77 extern caddr_t hypercall_shared_info_page;
78 78
79 79 static int
80 80 hvm_get_param(int param_id, uint64_t *val)
81 81 {
82 82 struct xen_hvm_param xhp;
83 83
84 84 xhp.domid = DOMID_SELF;
85 85 xhp.index = param_id;
86 86 if ((HYPERVISOR_hvm_op(HVMOP_get_param, &xhp) < 0))
87 87 return (-1);
88 88 *val = xhp.value;
89 89 return (0);
90 90 }
91 91
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92 92 void
93 93 xen_hvm_init(void)
94 94 {
95 95 struct cpuid_regs cp;
96 96 uint32_t xen_signature[4], base;
97 97 char *xen_str;
98 98 struct xen_add_to_physmap xatp;
99 99 xen_capabilities_info_t caps;
100 100 pfn_t pfn;
101 101 uint64_t msrval, val;
102 + extern int apix_enable;
102 103
103 104 if (xen_hvm_inited != 0)
104 105 return;
105 106
106 107 xen_hvm_inited = 1;
107 108
108 109 /*
109 110 * Xen's pseudo-cpuid function returns a string representing
110 111 * the Xen signature in %ebx, %ecx, and %edx.
111 112 * Loop over the base values, since it may be different if
112 113 * the hypervisor has hyper-v emulation switched on.
113 114 *
114 115 * %eax contains the maximum supported cpuid function.
115 116 */
116 117 for (base = 0x40000000; base < 0x40010000; base += 0x100) {
117 118 cp.cp_eax = base;
118 119 (void) __cpuid_insn(&cp);
119 120 xen_signature[0] = cp.cp_ebx;
120 121 xen_signature[1] = cp.cp_ecx;
121 122 xen_signature[2] = cp.cp_edx;
122 123 xen_signature[3] = 0;
123 124 xen_str = (char *)xen_signature;
124 125 if (strcmp("XenVMMXenVMM", xen_str) == 0 &&
125 126 cp.cp_eax >= (base + 2))
126 127 break;
127 128 }
128 129 if (base >= 0x40010000)
129 130 return;
130 131
131 132 /*
132 133 * cpuid function at base + 1 returns the Xen version in %eax. The
133 134 * top 16 bits are the major version, the bottom 16 are the minor
134 135 * version.
135 136 */
136 137 cp.cp_eax = base + 1;
137 138 (void) __cpuid_insn(&cp);
138 139 xen_major = cp.cp_eax >> 16;
139 140 xen_minor = cp.cp_eax & 0xffff;
140 141
141 142 /*
142 143 * Below version 3.1 we can't do anything special as a HVM domain;
143 144 * the PV drivers don't work, many hypercalls are not available,
144 145 * etc.
145 146 */
146 147 if (xen_major < 3 || (xen_major == 3 && xen_minor < 1))
147 148 return;
148 149
149 150 /*
150 151 * cpuid function at base + 2 returns information about the
151 152 * hypercall page. %eax nominally contains the number of pages
152 153 * with hypercall code, but according to the Xen guys, "I'll
153 154 * guarantee that remains one forever more, so you can just
154 155 * allocate a single page and get quite upset if you ever see CPUID
155 156 * return more than one page." %ebx contains an MSR we use to ask
156 157 * Xen to remap each page at a specific pfn.
157 158 */
158 159 cp.cp_eax = base + 2;
159 160 (void) __cpuid_insn(&cp);
160 161
161 162 /*
162 163 * Let Xen know where we want the hypercall page mapped. We
163 164 * already have a page allocated in the .text section to simplify
164 165 * the wrapper code.
165 166 */
166 167 pfn = va_to_pfn(&hypercall_page);
167 168 msrval = mmu_ptob(pfn);
168 169 wrmsr(cp.cp_ebx, msrval);
169 170
170 171 /* Fill in the xen_info data */
171 172 xen_info = &__xen_info;
172 173 (void) sprintf(xen_info->magic, "xen-%d.%d", xen_major, xen_minor);
173 174
174 175 if (hvm_get_param(HVM_PARAM_STORE_PFN, &val) < 0)
175 176 return;
176 177 /*
177 178 * The first hypercall worked, so mark hypercalls as working.
178 179 */
179 180 xen_hvm_features |= XEN_HVM_HYPERCALLS;
180 181
181 182 xen_info->store_mfn = (mfn_t)val;
182 183 if (hvm_get_param(HVM_PARAM_STORE_EVTCHN, &val) < 0)
183 184 return;
184 185 xen_info->store_evtchn = (mfn_t)val;
185 186
186 187 /* Figure out whether the hypervisor is 32-bit or 64-bit. */
187 188 if ((HYPERVISOR_xen_version(XENVER_capabilities, &caps) == 0)) {
188 189 ((char *)(caps))[sizeof (caps) - 1] = '\0';
189 190 if (strstr(caps, "x86_64") != NULL)
190 191 xen_bits = 64;
191 192 else if (strstr(caps, "x86_32") != NULL)
192 193 xen_bits = 32;
193 194 }
194 195
195 196 if (xen_bits < 0)
196 197 return;
197 198 #ifdef __amd64
198 199 ASSERT(xen_bits == 64);
199 200 #endif
200 201
201 202 /*
202 203 * Allocate space for the shared_info page and tell Xen where it
203 204 * is.
204 205 */
205 206 xen_shared_info_frame = va_to_pfn(&hypercall_shared_info_page);
206 207 xatp.domid = DOMID_SELF;
207 208 xatp.idx = 0;
208 209 xatp.space = XENMAPSPACE_shared_info;
209 210 xatp.gpfn = xen_shared_info_frame;
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210 211 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0)
211 212 return;
212 213
213 214 HYPERVISOR_shared_info = (void *)&hypercall_shared_info_page;
214 215
215 216 /*
216 217 * A working HVM tlb flush hypercall was introduced in Xen 3.3.
217 218 */
218 219 if (xen_major > 3 || (xen_major == 3 && xen_minor >= 3))
219 220 xen_hvm_features |= XEN_HVM_TLBFLUSH;
221 +
222 + /* FIXME Disable apix for the time being */
223 + apix_enable = 0;
220 224 }
221 225
222 226 /*
223 227 * Returns:
224 228 * -1 if a feature is not available
225 229 * 1 if a boolean feature is available
226 230 * > 0 if numeric feature is available
227 231 */
228 232 int
229 233 xpv_feature(int which)
230 234 {
231 235 switch (which) {
232 236 case XPVF_BITS:
233 237 return (xen_bits);
234 238 case XPVF_VERSION_MAJOR:
235 239 return (xen_major);
236 240 case XPVF_VERSION_MINOR:
237 241 return (xen_minor);
238 242 case XPVF_HYPERCALLS:
239 243 if (xen_hvm_features & XEN_HVM_HYPERCALLS)
240 244 return (1);
241 245 break;
242 246 case XPVF_SHARED_INFO:
243 247 if (HYPERVISOR_shared_info != NULL)
244 248 return (1);
245 249 break;
246 250 case XPVF_TLB_FLUSH:
247 251 if (xen_hvm_features & XEN_HVM_TLBFLUSH)
248 252 return (1);
249 253 break;
250 254 default:
251 255 break;
252 256 }
253 257
254 258 return (-1);
255 259 }
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