This source file includes following definitions.
- check_platform_magic
- xen_has_pv_devices
- __xen_has_pv_device
- xen_has_pv_nic_devices
- xen_has_pv_disk_devices
- xen_has_pv_and_legacy_disk_devices
- xen_unplug_emulated_devices
- parse_xen_emul_unplug
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10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/export.h>
13
14 #include <xen/xen.h>
15 #include <xen/platform_pci.h>
16 #include "xen-ops.h"
17
18 #define XEN_PLATFORM_ERR_MAGIC -1
19 #define XEN_PLATFORM_ERR_PROTOCOL -2
20 #define XEN_PLATFORM_ERR_BLACKLIST -3
21
22
23 static int xen_platform_pci_unplug;
24 static int xen_emul_unplug;
25
26 static int check_platform_magic(void)
27 {
28 short magic;
29 char protocol;
30
31 magic = inw(XEN_IOPORT_MAGIC);
32 if (magic != XEN_IOPORT_MAGIC_VAL) {
33 printk(KERN_ERR "Xen Platform PCI: unrecognised magic value\n");
34 return XEN_PLATFORM_ERR_MAGIC;
35 }
36
37 protocol = inb(XEN_IOPORT_PROTOVER);
38
39 printk(KERN_DEBUG "Xen Platform PCI: I/O protocol version %d\n",
40 protocol);
41
42 switch (protocol) {
43 case 1:
44 outw(XEN_IOPORT_LINUX_PRODNUM, XEN_IOPORT_PRODNUM);
45 outl(XEN_IOPORT_LINUX_DRVVER, XEN_IOPORT_DRVVER);
46 if (inw(XEN_IOPORT_MAGIC) != XEN_IOPORT_MAGIC_VAL) {
47 printk(KERN_ERR "Xen Platform: blacklisted by host\n");
48 return XEN_PLATFORM_ERR_BLACKLIST;
49 }
50 break;
51 default:
52 printk(KERN_WARNING "Xen Platform PCI: unknown I/O protocol version\n");
53 return XEN_PLATFORM_ERR_PROTOCOL;
54 }
55
56 return 0;
57 }
58
59 bool xen_has_pv_devices(void)
60 {
61 if (!xen_domain())
62 return false;
63
64
65 if (xen_pv_domain() || xen_pvh_domain())
66 return true;
67
68
69
70 if (xen_platform_pci_unplug == 0)
71 return false;
72
73 if (xen_platform_pci_unplug & XEN_UNPLUG_NEVER)
74 return false;
75
76 if (xen_platform_pci_unplug & XEN_UNPLUG_ALL)
77 return true;
78
79
80
81 if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY)
82 return true;
83
84
85
86 return false;
87 }
88 EXPORT_SYMBOL_GPL(xen_has_pv_devices);
89
90 static bool __xen_has_pv_device(int state)
91 {
92
93 if (xen_hvm_domain() && (xen_platform_pci_unplug & state))
94 return true;
95
96 return xen_has_pv_devices();
97 }
98
99 bool xen_has_pv_nic_devices(void)
100 {
101 return __xen_has_pv_device(XEN_UNPLUG_ALL_NICS | XEN_UNPLUG_ALL);
102 }
103 EXPORT_SYMBOL_GPL(xen_has_pv_nic_devices);
104
105 bool xen_has_pv_disk_devices(void)
106 {
107 return __xen_has_pv_device(XEN_UNPLUG_ALL_IDE_DISKS |
108 XEN_UNPLUG_AUX_IDE_DISKS | XEN_UNPLUG_ALL);
109 }
110 EXPORT_SYMBOL_GPL(xen_has_pv_disk_devices);
111
112
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115
116
117 bool xen_has_pv_and_legacy_disk_devices(void)
118 {
119 if (!xen_domain())
120 return false;
121
122
123 if (xen_pv_domain())
124 return false;
125
126 if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY)
127 return true;
128
129 return false;
130 }
131 EXPORT_SYMBOL_GPL(xen_has_pv_and_legacy_disk_devices);
132
133 void xen_unplug_emulated_devices(void)
134 {
135 int r;
136
137
138 if (xen_pvh_domain())
139 return;
140
141
142 if (xen_emul_unplug & XEN_UNPLUG_NEVER)
143 return;
144
145 r = check_platform_magic();
146
147
148
149
150 if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
151 (xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
152 return;
153
154
155
156 if (!xen_emul_unplug) {
157 if (xen_must_unplug_nics()) {
158 printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
159 "been compiled for this kernel: unplug emulated NICs.\n");
160 xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
161 }
162 if (xen_must_unplug_disks()) {
163 printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
164 "been compiled for this kernel: unplug emulated disks.\n"
165 "You might have to change the root device\n"
166 "from /dev/hd[a-d] to /dev/xvd[a-d]\n"
167 "in your root= kernel command line option\n");
168 xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
169 }
170 }
171
172 if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
173 outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
174 xen_platform_pci_unplug = xen_emul_unplug;
175 }
176
177 static int __init parse_xen_emul_unplug(char *arg)
178 {
179 char *p, *q;
180 int l;
181
182 for (p = arg; p; p = q) {
183 q = strchr(p, ',');
184 if (q) {
185 l = q - p;
186 q++;
187 } else {
188 l = strlen(p);
189 }
190 if (!strncmp(p, "all", l))
191 xen_emul_unplug |= XEN_UNPLUG_ALL;
192 else if (!strncmp(p, "ide-disks", l))
193 xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
194 else if (!strncmp(p, "aux-ide-disks", l))
195 xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
196 else if (!strncmp(p, "nics", l))
197 xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
198 else if (!strncmp(p, "unnecessary", l))
199 xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY;
200 else if (!strncmp(p, "never", l))
201 xen_emul_unplug |= XEN_UNPLUG_NEVER;
202 else
203 printk(KERN_WARNING "unrecognised option '%s' "
204 "in parameter 'xen_emul_unplug'\n", p);
205 }
206 return 0;
207 }
208 early_param("xen_emul_unplug", parse_xen_emul_unplug);