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