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adeefe0167
This commit was produced with the included Coccinelle script scripts/coccinelle/exec_rw_const. Inspired-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
292 lines
8.3 KiB
C
292 lines
8.3 KiB
C
/*
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* graphics passthrough
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "xen_pt.h"
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#include "xen-host-pci-device.h"
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#include "hw/xen/xen-legacy-backend.h"
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static unsigned long igd_guest_opregion;
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static unsigned long igd_host_opregion;
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#define XEN_PCI_INTEL_OPREGION_MASK 0xfff
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typedef struct VGARegion {
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int type; /* Memory or port I/O */
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uint64_t guest_base_addr;
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uint64_t machine_base_addr;
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uint64_t size; /* size of the region */
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int rc;
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} VGARegion;
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#define IORESOURCE_IO 0x00000100
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#define IORESOURCE_MEM 0x00000200
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static struct VGARegion vga_args[] = {
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{
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.type = IORESOURCE_IO,
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.guest_base_addr = 0x3B0,
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.machine_base_addr = 0x3B0,
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.size = 0xC,
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.rc = -1,
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},
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{
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.type = IORESOURCE_IO,
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.guest_base_addr = 0x3C0,
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.machine_base_addr = 0x3C0,
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.size = 0x20,
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.rc = -1,
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},
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{
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.type = IORESOURCE_MEM,
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.guest_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
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.machine_base_addr = 0xa0000 >> XC_PAGE_SHIFT,
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.size = 0x20,
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.rc = -1,
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},
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};
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/*
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* register VGA resources for the domain with assigned gfx
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*/
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int xen_pt_register_vga_regions(XenHostPCIDevice *dev)
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{
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int i = 0;
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if (!is_igd_vga_passthrough(dev)) {
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return 0;
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}
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for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
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if (vga_args[i].type == IORESOURCE_IO) {
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vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
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vga_args[i].guest_base_addr,
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vga_args[i].machine_base_addr,
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vga_args[i].size, DPCI_ADD_MAPPING);
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} else {
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vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
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vga_args[i].guest_base_addr,
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vga_args[i].machine_base_addr,
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vga_args[i].size, DPCI_ADD_MAPPING);
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}
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if (vga_args[i].rc) {
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XEN_PT_ERR(NULL, "VGA %s mapping failed! (rc: %i)\n",
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vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
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vga_args[i].rc);
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return vga_args[i].rc;
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}
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}
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return 0;
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}
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/*
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* unregister VGA resources for the domain with assigned gfx
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*/
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int xen_pt_unregister_vga_regions(XenHostPCIDevice *dev)
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{
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int i = 0;
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int ret = 0;
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if (!is_igd_vga_passthrough(dev)) {
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return 0;
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}
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for (i = 0 ; i < ARRAY_SIZE(vga_args); i++) {
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if (vga_args[i].type == IORESOURCE_IO) {
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vga_args[i].rc = xc_domain_ioport_mapping(xen_xc, xen_domid,
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vga_args[i].guest_base_addr,
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vga_args[i].machine_base_addr,
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vga_args[i].size, DPCI_REMOVE_MAPPING);
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} else {
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vga_args[i].rc = xc_domain_memory_mapping(xen_xc, xen_domid,
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vga_args[i].guest_base_addr,
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vga_args[i].machine_base_addr,
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vga_args[i].size, DPCI_REMOVE_MAPPING);
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}
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if (vga_args[i].rc) {
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XEN_PT_ERR(NULL, "VGA %s unmapping failed! (rc: %i)\n",
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vga_args[i].type == IORESOURCE_IO ? "ioport" : "memory",
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vga_args[i].rc);
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return vga_args[i].rc;
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}
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}
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if (igd_guest_opregion) {
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ret = xc_domain_memory_mapping(xen_xc, xen_domid,
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(unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT),
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(unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
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3,
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DPCI_REMOVE_MAPPING);
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if (ret) {
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return ret;
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}
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}
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return 0;
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}
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static void *get_vgabios(XenPCIPassthroughState *s, int *size,
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XenHostPCIDevice *dev)
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{
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return pci_assign_dev_load_option_rom(&s->dev, size,
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dev->domain, dev->bus,
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dev->dev, dev->func);
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}
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/* Refer to Seabios. */
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struct rom_header {
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uint16_t signature;
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uint8_t size;
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uint8_t initVector[4];
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uint8_t reserved[17];
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uint16_t pcioffset;
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uint16_t pnpoffset;
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} __attribute__((packed));
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struct pci_data {
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uint32_t signature;
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uint16_t vendor;
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uint16_t device;
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uint16_t vitaldata;
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uint16_t dlen;
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uint8_t drevision;
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uint8_t class_lo;
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uint16_t class_hi;
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uint16_t ilen;
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uint16_t irevision;
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uint8_t type;
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uint8_t indicator;
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uint16_t reserved;
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} __attribute__((packed));
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void xen_pt_setup_vga(XenPCIPassthroughState *s, XenHostPCIDevice *dev,
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Error **errp)
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{
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unsigned char *bios = NULL;
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struct rom_header *rom;
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int bios_size;
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char *c = NULL;
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char checksum = 0;
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uint32_t len = 0;
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struct pci_data *pd = NULL;
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if (!is_igd_vga_passthrough(dev)) {
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error_setg(errp, "Need to enable igd-passthrough");
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return;
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}
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bios = get_vgabios(s, &bios_size, dev);
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if (!bios) {
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error_setg(errp, "VGA: Can't get VBIOS");
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return;
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}
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if (bios_size < sizeof(struct rom_header)) {
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error_setg(errp, "VGA: VBIOS image corrupt (too small)");
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return;
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}
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/* Currently we fixed this address as a primary. */
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rom = (struct rom_header *)bios;
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if (rom->pcioffset + sizeof(struct pci_data) > bios_size) {
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error_setg(errp, "VGA: VBIOS image corrupt (bad pcioffset field)");
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return;
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}
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pd = (void *)(bios + (unsigned char)rom->pcioffset);
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/* We may need to fixup Device Identification. */
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if (pd->device != s->real_device.device_id) {
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pd->device = s->real_device.device_id;
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len = rom->size * 512;
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if (len > bios_size) {
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error_setg(errp, "VGA: VBIOS image corrupt (bad size field)");
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return;
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}
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/* Then adjust the bios checksum */
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for (c = (char *)bios; c < ((char *)bios + len); c++) {
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checksum += *c;
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}
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if (checksum) {
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bios[len - 1] -= checksum;
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XEN_PT_LOG(&s->dev, "vga bios checksum is adjusted %x!\n",
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checksum);
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}
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}
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/* Currently we fixed this address as a primary for legacy BIOS. */
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cpu_physical_memory_write(0xc0000, bios, bios_size);
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}
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uint32_t igd_read_opregion(XenPCIPassthroughState *s)
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{
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uint32_t val = 0;
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if (!igd_guest_opregion) {
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return val;
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}
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val = igd_guest_opregion;
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XEN_PT_LOG(&s->dev, "Read opregion val=%x\n", val);
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return val;
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}
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#define XEN_PCI_INTEL_OPREGION_PAGES 0x3
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#define XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED 0x1
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void igd_write_opregion(XenPCIPassthroughState *s, uint32_t val)
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{
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int ret;
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if (igd_guest_opregion) {
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XEN_PT_LOG(&s->dev, "opregion register already been set, ignoring %x\n",
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val);
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return;
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}
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/* We just work with LE. */
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xen_host_pci_get_block(&s->real_device, XEN_PCI_INTEL_OPREGION,
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(uint8_t *)&igd_host_opregion, 4);
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igd_guest_opregion = (unsigned long)(val & ~XEN_PCI_INTEL_OPREGION_MASK)
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| (igd_host_opregion & XEN_PCI_INTEL_OPREGION_MASK);
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ret = xc_domain_iomem_permission(xen_xc, xen_domid,
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(unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
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XEN_PCI_INTEL_OPREGION_PAGES,
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XEN_PCI_INTEL_OPREGION_ENABLE_ACCESSED);
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if (ret) {
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XEN_PT_ERR(&s->dev, "[%d]:Can't enable to access IGD host opregion:"
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" 0x%lx.\n", ret,
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(unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT)),
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igd_guest_opregion = 0;
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return;
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}
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ret = xc_domain_memory_mapping(xen_xc, xen_domid,
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(unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT),
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(unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
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XEN_PCI_INTEL_OPREGION_PAGES,
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DPCI_ADD_MAPPING);
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if (ret) {
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XEN_PT_ERR(&s->dev, "[%d]:Can't map IGD host opregion:0x%lx to"
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" guest opregion:0x%lx.\n", ret,
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(unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
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(unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT));
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igd_guest_opregion = 0;
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return;
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}
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XEN_PT_LOG(&s->dev, "Map OpRegion: 0x%lx -> 0x%lx\n",
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(unsigned long)(igd_host_opregion >> XC_PAGE_SHIFT),
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(unsigned long)(igd_guest_opregion >> XC_PAGE_SHIFT));
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}
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