1
2
3
4#include "qemu/osdep.h"
5#include "qapi/error.h"
6#include "xen_pt.h"
7#include "xen-host-pci-device.h"
8#include "hw/xen/xen-legacy-backend.h"
9
10static unsigned long igd_guest_opregion;
11static unsigned long igd_host_opregion;
12
13#define XEN_PCI_INTEL_OPREGION_MASK 0xfff
14
15typedef struct VGARegion {
16 int type;
17 uint64_t guest_base_addr;
18 uint64_t machine_base_addr;
19 uint64_t size;
20 int rc;
21} VGARegion;
22
23#define IORESOURCE_IO 0x00000100
24#define IORESOURCE_MEM 0x00000200
25
26static struct VGARegion vga_args[] = {
27 {
28 .type = IORESOURCE_IO,
29 .guest_base_addr = 0x3B0,
30 .machine_base_addr = 0x3B0,
31 .size = 0xC,
32 .rc = -1,
33 },
34 {
35 .type = IORESOURCE_IO,
36 .guest_base_addr = 0x3C0,
37 .machine_base_addr = 0x3C0,
38 .size = 0x20,
39 .rc = -1,
40 },
41 {
42 .type = IORESOURCE_MEM,
43 .guest_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
44 .machine_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
45 .size = 0x20,
46 .rc = -1,
47 },
48};
49
50
51
52
53int xen_pt_register_vga_regions(XenHostPCIDevice *dev)
54{
55 int i = 0;
56
57 if (!is_igd_vga_passthrough(dev)) {
58 return 0;
59 }
60
61 for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
62 if (vga_args[i].type == IORESOURCE_IO) {
63 vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
64 vga_args[i].guest_base_addr,
65 vga_args[i].machine_base_addr,
66 vga_args[i].size, DPCI_ADD_MAPPING);
67 } else {
68 vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
69 vga_args[i].guest_base_addr,
70 vga_args[i].machine_base_addr,
71 vga_args[i].size, DPCI_ADD_MAPPING);
72 }
73
74 if (vga_args[i].rc) {
75 XEN_PT_ERR(NULL, "VGA %s mapping failed! (rc: %i)\n",
76 vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
77 vga_args[i].rc);
78 return vga_args[i].rc;
79 }
80 }
81
82 return 0;
83}
84
85
86
87
88int xen_pt_unregister_vga_regions(XenHostPCIDevice *dev)
89{
90 int i = 0;
91 int ret = 0;
92
93 if (!is_igd_vga_passthrough(dev)) {
94 return 0;
95 }
96
97 for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
98 if (vga_args[i].type == IORESOURCE_IO) {
99 vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
100 vga_args[i].guest_base_addr,
101 vga_args[i].machine_base_addr,
102 vga_args[i].size, DPCI_REMOVE_MAPPING);
103 } else {
104 vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
105 vga_args[i].guest_base_addr,
106 vga_args[i].machine_base_addr,
107 vga_args[i].size, DPCI_REMOVE_MAPPING);
108 }
109
110 if (vga_args[i].rc) {
111 XEN_PT_ERR(NULL, "VGA %s unmapping failed! (rc: %i)\n",
112 vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
113 vga_args[i].rc);
114 return vga_args[i].rc;
115 }
116 }
117
118 if (igd_guest_opregion) {
119 ret = xc_domain_memory_mapping(xen_xc, xen_domid,
120 (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT),
121 (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
122 3,
123 DPCI_REMOVE_MAPPING);
124 if (ret) {
125 return ret;
126 }
127 }
128
129 return 0;
130}
131
132static void *get_vgabios(XenPCIPassthroughState *s, int *size,
133 XenHostPCIDevice *dev)
134{
135 return pci_assign_dev_load_option_rom(&s->dev, size,
136 dev->domain, dev->bus,
137 dev->dev, dev->func);
138}
139
140
141struct rom_header {
142 uint16_t signature;
143 uint8_t size;
144 uint8_t initVector[4];
145 uint8_t reserved[17];
146 uint16_t pcioffset;
147 uint16_t pnpoffset;
148} __attribute__((packed));
149
150struct pci_data {
151 uint32_t signature;
152 uint16_t vendor;
153 uint16_t device;
154 uint16_t vitaldata;
155 uint16_t dlen;
156 uint8_t drevision;
157 uint8_t class_lo;
158 uint16_t class_hi;
159 uint16_t ilen;
160 uint16_t irevision;
161 uint8_t type;
162 uint8_t indicator;
163 uint16_t reserved;
164} __attribute__((packed));
165
166void xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev,
167 Error **errp)
168{
169 unsigned char *bios = NULL;
170 struct rom_header *rom;
171 int bios_size;
172 char *c = NULL;
173 char checksum = 0;
174 uint32_t len = 0;
175 struct pci_data *pd = NULL;
176
177 if (!is_igd_vga_passthrough(dev)) {
178 error_setg(errp, "Need to enable igd-passthrough");
179 return;
180 }
181
182 bios = get_vgabios(s, &bios_size, dev);
183 if (!bios) {
184 error_setg(errp, "VGA: Can't get VBIOS");
185 return;
186 }
187
188 if (bios_size < sizeof(struct rom_header)) {
189 error_setg(errp, "VGA: VBIOS image corrupt (too small)");
190 return;
191 }
192
193
194 rom = (struct rom_header *)bios;
195
196 if (rom->pcioffset + sizeof(struct pci_data) > bios_size) {
197 error_setg(errp, "VGA: VBIOS image corrupt (bad pcioffset field)");
198 return;
199 }
200
201 pd = (void *)(bios + (unsigned char)rom->pcioffset);
202
203
204 if (pd->device != s->real_device.device_id) {
205 pd->device = s->real_device.device_id;
206
207 len = rom->size * 512;
208 if (len > bios_size) {
209 error_setg(errp, "VGA: VBIOS image corrupt (bad size field)");
210 return;
211 }
212
213
214 for (c = (char *)bios; c < ((char *)bios + len); c++) {
215 checksum += *c;
216 }
217 if (checksum) {
218 bios[len - 1] -= checksum;
219 XEN_PT_LOG(&s->dev, "vga bios checksum is adjusted %x!\n",
220 checksum);
221 }
222 }
223
224
225 cpu_physical_memory_rw(0xc0000, bios, bios_size, 1);
226}
227
228uint32_t igd_read_opregion(XenPCIPassthroughState *s)
229{
230 uint32_t val = 0;
231
232 if (!igd_guest_opregion) {
233 return val;
234 }
235
236 val = igd_guest_opregion;
237
238 XEN_PT_LOG(&s->dev, "Read opregion val=%x\n", val);
239 return val;
240}
241
242#define XEN_PCI_INTEL_OPREGION_PAGES 0x3
243#define XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED 0x1
244void igd_write_opregion(XenPCIPassthroughState *s, uint32_t val)
245{
246 int ret;
247
248 if (igd_guest_opregion) {
249 XEN_PT_LOG(&s->dev, "opregion register already been set, ignoring %x\n",
250 val);
251 return;
252 }
253
254
255 xen_host_pci_get_block(&s->real_device, XEN_PCI_INTEL_OPREGION,
256 (uint8_t *)&igd_host_opregion, 4);
257 igd_guest_opregion = (unsigned long)(val & ~XEN_PCI_INTEL_OPREGION_MASK)
258 | (igd_host_opregion & XEN_PCI_INTEL_OPREGION_MASK);
259
260 ret = xc_domain_iomem_permission(xen_xc, xen_domid,
261 (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
262 XEN_PCI_INTEL_OPREGION_PAGES,
263 XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED);
264
265 if (ret) {
266 XEN_PT_ERR(&s->dev, "[%d]:Can't enable to access IGD host opregion:"
267 " 0x%lx.\n", ret,
268 (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT)),
269 igd_guest_opregion = 0;
270 return;
271 }
272
273 ret = xc_domain_memory_mapping(xen_xc, xen_domid,
274 (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT),
275 (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
276 XEN_PCI_INTEL_OPREGION_PAGES,
277 DPCI_ADD_MAPPING);
278
279 if (ret) {
280 XEN_PT_ERR(&s->dev, "[%d]:Can't map IGD host opregion:0x%lx to"
281 " guest opregion:0x%lx.\n", ret,
282 (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
283 (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT));
284 igd_guest_opregion = 0;
285 return;
286 }
287
288 XEN_PT_LOG(&s->dev, "Map OpRegion: 0x%lx -> 0x%lx\n",
289 (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
290 (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT));
291}
292
