piix: create host bridge to passthrough
Implement a pci host bridge specific to passthrough. Actually this just inherits the standard one. And we also just expose a minimal real host bridge pci configuration subset. [Replace pread with lseek and read to fix Windows build] Signed-off-by: Tiejun Chen <tiejun.chen@intel.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Michael S. Tsirkin <mst@redhat.com>
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@ -739,6 +739,90 @@ static const TypeInfo i440fx_info = {
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.class_init = i440fx_class_init,
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.class_init = i440fx_class_init,
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};
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};
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/* IGD Passthrough Host Bridge. */
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typedef struct {
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uint8_t offset;
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uint8_t len;
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} IGDHostInfo;
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/* Here we just expose minimal host bridge offset subset. */
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static const IGDHostInfo igd_host_bridge_infos[] = {
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{0x08, 2}, /* revision id */
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{0x2c, 2}, /* sybsystem vendor id */
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{0x2e, 2}, /* sybsystem id */
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{0x50, 2}, /* SNB: processor graphics control register */
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{0x52, 2}, /* processor graphics control register */
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{0xa4, 4}, /* SNB: graphics base of stolen memory */
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{0xa8, 4}, /* SNB: base of GTT stolen memory */
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};
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static int host_pci_config_read(int pos, int len, uint32_t val)
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{
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char path[PATH_MAX];
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int config_fd;
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ssize_t size = sizeof(path);
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/* Access real host bridge. */
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int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s",
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0, 0, 0, 0, "config");
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if (rc >= size || rc < 0) {
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return -ENODEV;
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}
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config_fd = open(path, O_RDWR);
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if (config_fd < 0) {
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return -ENODEV;
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}
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if (lseek(config_fd, pos, SEEK_SET) != pos) {
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return -errno;
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}
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do {
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rc = read(config_fd, (uint8_t *)&val, len);
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} while (rc < 0 && (errno == EINTR || errno == EAGAIN));
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if (rc != len) {
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return -errno;
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}
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return 0;
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}
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static int igd_pt_i440fx_initfn(struct PCIDevice *pci_dev)
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{
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uint32_t val = 0;
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int rc, i, num;
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int pos, len;
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num = ARRAY_SIZE(igd_host_bridge_infos);
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for (i = 0; i < num; i++) {
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pos = igd_host_bridge_infos[i].offset;
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len = igd_host_bridge_infos[i].len;
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rc = host_pci_config_read(pos, len, val);
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if (rc) {
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return -ENODEV;
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}
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pci_default_write_config(pci_dev, pos, val, len);
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}
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return 0;
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}
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static void igd_passthrough_i440fx_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
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k->init = igd_pt_i440fx_initfn;
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dc->desc = "IGD Passthrough Host bridge";
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}
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static const TypeInfo igd_passthrough_i440fx_info = {
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.name = TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE,
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.parent = TYPE_I440FX_PCI_DEVICE,
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.instance_size = sizeof(PCII440FXState),
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.class_init = igd_passthrough_i440fx_class_init,
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};
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static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
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static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,
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PCIBus *rootbus)
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PCIBus *rootbus)
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{
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{
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@ -780,6 +864,7 @@ static const TypeInfo i440fx_pcihost_info = {
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static void i440fx_register_types(void)
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static void i440fx_register_types(void)
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{
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{
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type_register_static(&i440fx_info);
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type_register_static(&i440fx_info);
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type_register_static(&igd_passthrough_i440fx_info);
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type_register_static(&piix3_pci_type_info);
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type_register_static(&piix3_pci_type_info);
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type_register_static(&piix3_info);
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type_register_static(&piix3_info);
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type_register_static(&piix3_xen_info);
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type_register_static(&piix3_xen_info);
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@ -222,6 +222,8 @@ typedef struct PCII440FXState PCII440FXState;
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#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
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#define TYPE_I440FX_PCI_HOST_BRIDGE "i440FX-pcihost"
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#define TYPE_I440FX_PCI_DEVICE "i440FX"
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#define TYPE_I440FX_PCI_DEVICE "i440FX"
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#define TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE "igd-passthrough-i440FX"
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PCIBus *i440fx_init(const char *host_type, const char *pci_type,
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PCIBus *i440fx_init(const char *host_type, const char *pci_type,
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PCII440FXState **pi440fx_state, int *piix_devfn,
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PCII440FXState **pi440fx_state, int *piix_devfn,
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ISABus **isa_bus, qemu_irq *pic,
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ISABus **isa_bus, qemu_irq *pic,
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