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