qemu/hw/xen/xen_pt_graphics.c

   1 /*
   2  * graphics passthrough
   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_backend.h"
   9
  10 static unsigned long igd_guest_opregion;
  11 static unsigned long igd_host_opregion;
  12
  13 #define XEN_PCI_INTEL_OPREGION_MASK 0xfff
  14
  15 typedef struct VGARegion {
  16     int type;           /* Memory or port I/O */
  17     uint64_t guest_base_addr;
  18     uint64_t machine_base_addr;
  19     uint64_t size;    /* size of the region */
  20     int rc;
  21 } VGARegion;
  22
  23 #define IORESOURCE_IO           0x00000100
  24 #define IORESOURCE_MEM          0x00000200
  25
  26 static 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  * register VGA resources for the domain with assigned gfx
  52  */
  53 int 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  * unregister VGA resources for the domain with assigned gfx
  87  */
  88 int 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
 132 static void *get_vgabios(XenPCIPassthroughState *s, int *size,
 133                        XenHostPCIDevice *dev)
 134 {
 135     return pci_assign_dev_load_option_rom(&s->dev, OBJECT(&s->dev), size,
 136                                           dev->domain, dev->bus,
 137                                           dev->dev, dev->func);
 138 }
 139
 140 /* Refer to Seabios. */
 141 struct 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
 150 struct 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
 166 void 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     /* Currently we fixed this address as a primary. */
 189     rom = (struct rom_header *)bios;
 190     pd = (void *)(bios + (unsigned char)rom->pcioffset);
 191
 192     /* We may need to fixup Device Identification. */
 193     if (pd->device != s->real_device.device_id) {
 194         pd->device = s->real_device.device_id;
 195
 196         len = rom->size * 512;
 197         /* Then adjust the bios checksum */
 198         for (c = (char *)bios; c < ((char *)bios + len); c++) {
 199             checksum += *c;
 200         }
 201         if (checksum) {
 202             bios[len - 1] -= checksum;
 203             XEN_PT_LOG(&s->dev, "vga bios checksum is adjusted %x!\n",
 204                        checksum);
 205         }
 206     }
 207
 208     /* Currently we fixed this address as a primary for legacy BIOS. */
 209     cpu_physical_memory_rw(0xc0000, bios, bios_size, 1);
 210 }
 211
 212 uint32_t igd_read_opregion(XenPCIPassthroughState *s)
 213 {
 214     uint32_t val = 0;
 215
 216     if (!igd_guest_opregion) {
 217         return val;
 218     }
 219
 220     val = igd_guest_opregion;
 221
 222     XEN_PT_LOG(&s->dev, "Read opregion val=%x\n", val);
 223     return val;
 224 }
 225
 226 #define XEN_PCI_INTEL_OPREGION_PAGES 0x3
 227 #define XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED 0x1
 228 void igd_write_opregion(XenPCIPassthroughState *s, uint32_t val)
 229 {
 230     int ret;
 231
 232     if (igd_guest_opregion) {
 233         XEN_PT_LOG(&s->dev, "opregion register already been set, ignoring %x\n",
 234                    val);
 235         return;
 236     }
 237
 238     /* We just work with LE. */
 239     xen_host_pci_get_block(&s->real_device, XEN_PCI_INTEL_OPREGION,
 240             (uint8_t *)&igd_host_opregion, 4);
 241     igd_guest_opregion = (unsigned long)(val & ~XEN_PCI_INTEL_OPREGION_MASK)
 242                             | (igd_host_opregion & XEN_PCI_INTEL_OPREGION_MASK);
 243
 244     ret = xc_domain_iomem_permission(xen_xc, xen_domid,
 245             (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
 246             XEN_PCI_INTEL_OPREGION_PAGES,
 247             XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED);
 248
 249     if (ret) {
 250         XEN_PT_ERR(&s->dev, "[%d]:Can't enable to access IGD host opregion:"
 251                     " 0x%lx.\n", ret,
 252                     (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT)),
 253         igd_guest_opregion = 0;
 254         return;
 255     }
 256
 257     ret = xc_domain_memory_mapping(xen_xc, xen_domid,
 258             (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT),
 259             (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
 260             XEN_PCI_INTEL_OPREGION_PAGES,
 261             DPCI_ADD_MAPPING);
 262
 263     if (ret) {
 264         XEN_PT_ERR(&s->dev, "[%d]:Can't map IGD host opregion:0x%lx to"
 265                     " guest opregion:0x%lx.\n", ret,
 266                     (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
 267                     (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT));
 268         igd_guest_opregion = 0;
 269         return;
 270     }
 271
 272     XEN_PT_LOG(&s->dev, "Map OpRegion: 0x%lx -> 0x%lx\n",
 273                     (unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
 274                     (unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT));
 275 }