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/*
* graphics passthrough
*/
#include "xen_pt.h"
#include "xen-host-pci-device.h"
#include "hw/xen/xen_backend.h"
typedef struct VGARegion {
int type; /* Memory or port I/O */
uint64_t guest_base_addr;
uint64_t machine_base_addr;
uint64_t size; /* size of the region */
int rc;
} VGARegion;
#define IORESOURCE_IO 0x00000100
#define IORESOURCE_MEM 0x00000200
static struct VGARegion vga_args[] = {
{
.type = IORESOURCE_IO,
.guest_base_addr = 0x3B0,
.machine_base_addr = 0x3B0,
.size = 0xC,
.rc = -1,
},
{
.type = IORESOURCE_IO,
.guest_base_addr = 0x3C0,
.machine_base_addr = 0x3C0,
.size = 0x20,
.rc = -1,
},
{
.type = IORESOURCE_MEM,
.guest_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
.machine_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
.size = 0x20,
.rc = -1,
},
};
/*
* register VGA resources for the domain with assigned gfx
*/
int xen_pt_register_vga_regions(XenHostPCIDevice *dev)
{
int i = 0;
if (!is_igd_vga_passthrough(dev)) {
return 0;
}
for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
if (vga_args[i].type == IORESOURCE_IO) {
vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
vga_args[i].guest_base_addr,
vga_args[i].machine_base_addr,
vga_args[i].size, DPCI_ADD_MAPPING);
} else {
vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
vga_args[i].guest_base_addr,
vga_args[i].machine_base_addr,
vga_args[i].size, DPCI_ADD_MAPPING);
}
if (vga_args[i].rc) {
XEN_PT_ERR(NULL, "VGA %s mapping failed! (rc: %i)\n",
vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
vga_args[i].rc);
return vga_args[i].rc;
}
}
return 0;
}
/*
* unregister VGA resources for the domain with assigned gfx
*/
int xen_pt_unregister_vga_regions(XenHostPCIDevice *dev)
{
int i = 0;
if (!is_igd_vga_passthrough(dev)) {
return 0;
}
for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
if (vga_args[i].type == IORESOURCE_IO) {
vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
vga_args[i].guest_base_addr,
vga_args[i].machine_base_addr,
vga_args[i].size, DPCI_REMOVE_MAPPING);
} else {
vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
vga_args[i].guest_base_addr,
vga_args[i].machine_base_addr,
vga_args[i].size, DPCI_REMOVE_MAPPING);
}
if (vga_args[i].rc) {
XEN_PT_ERR(NULL, "VGA %s unmapping failed! (rc: %i)\n",
vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
vga_args[i].rc);
return vga_args[i].rc;
}
}
return 0;
}
static void *get_vgabios(XenPCIPassthroughState *s, int *size,
XenHostPCIDevice *dev)
{
return pci_assign_dev_load_option_rom(&s->dev, OBJECT(&s->dev), size,
dev->domain, dev->bus,
dev->dev, dev->func);
}
/* Refer to Seabios. */
struct rom_header {
uint16_t signature;
uint8_t size;
uint8_t initVector[4];
uint8_t reserved[17];
uint16_t pcioffset;
uint16_t pnpoffset;
} __attribute__((packed));
struct pci_data {
uint32_t signature;
uint16_t vendor;
uint16_t device;
uint16_t vitaldata;
uint16_t dlen;
uint8_t drevision;
uint8_t class_lo;
uint16_t class_hi;
uint16_t ilen;
uint16_t irevision;
uint8_t type;
uint8_t indicator;
uint16_t reserved;
} __attribute__((packed));
int xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev)
{
unsigned char *bios = NULL;
struct rom_header *rom;
int bios_size;
char *c = NULL;
char checksum = 0;
uint32_t len = 0;
struct pci_data *pd = NULL;
if (!is_igd_vga_passthrough(dev)) {
return -1;
}
bios = get_vgabios(s, &bios_size, dev);
if (!bios) {
XEN_PT_ERR(&s->dev, "VGA: Can't getting VBIOS!\n");
return -1;
}
/* Currently we fixed this address as a primary. */
rom = (struct rom_header *)bios;
pd = (void *)(bios + (unsigned char)rom->pcioffset);
/* We may need to fixup Device Identification. */
if (pd->device != s->real_device.device_id) {
pd->device = s->real_device.device_id;
len = rom->size * 512;
/* Then adjust the bios checksum */
for (c = (char *)bios; c < ((char *)bios + len); c++) {
checksum += *c;
}
if (checksum) {
bios[len - 1] -= checksum;
XEN_PT_LOG(&s->dev, "vga bios checksum is adjusted %x!\n",
checksum);
}
}
/* Currently we fixed this address as a primary for legacy BIOS. */
cpu_physical_memory_rw(0xc0000, bios, bios_size, 1);
return 0;
}
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