Ben-Ami Yassour wrote:
> From: Or Sagi <[EMAIL PROTECTED]>
>
> From: Nir Peleg <[EMAIL PROTECTED]>
> From: Amit Shah <[EMAIL PROTECTED]>
> From: Glauber de Oliveira Costa <[EMAIL PROTECTED]>
>
> We can assign a device from the host machine to a guest. The
> original code comes from Neocleus.
>
> A new command-line option, -pcidevice is added.
> For example, to invoke it for an Ethernet device sitting at
> PCI bus:dev.fn 04:08.0 with host IRQ 18, use this:
>
> -pcidevice Ethernet/04:08.0
>
> The host ethernet driver is to be removed before doing the
> passthrough. If not, the device assignment fails but the
> guest continues without the assignment.
>
> If kvm uses the in-kernel irqchip, interrupts are routed to the
> guest via the kvm module (accompanied kernel changes are necessary).
>
> If -no-kvm-irqchip is used, the 'irqhook' module, available
> separately, is to be used for interrupt injection into the guest. In
> this case, an extra parameter, -<intr-number> is to be appended to
> the above-mentioned pcidevice parameter.
>
> Signed-off-by: Amit Shah <[EMAIL PROTECTED]>
> ---
> +static pt_dev_t *register_real_device(PCIBus *e_bus, const char
> *e_dev_name, + int e_devfn,
uint8_t r_bus, uint8_t r_dev,
> + uint8_t r_func)
> +{
> + int rc;
> + pt_dev_t *pci_dev;
> + uint8_t e_device, e_intx;
> +
> + DEBUG("register_real_device: Registering real physical "
> + "device %s (devfn=0x%x)\n", e_dev_name, e_devfn);
> +
> + pci_dev = (pt_dev_t *) pci_register_device(e_bus, e_dev_name,
> + sizeof(pt_dev_t),
e_devfn,
> + pt_pci_read_config,
> + pt_pci_write_config);
> +
> + if (NULL == pci_dev) {
> + fprintf(stderr, "register_real_device: Error: Couldn't "
> + "register real device %s\n", e_dev_name);
> + return NULL;
> + }
> + if (pt_get_real_device(pci_dev, r_bus, r_dev, r_func)) {
> + fprintf(stderr, "register_real_device: Error: Couldn't
get "
> + "real device (%s)!\n", e_dev_name);
> + return NULL;
> + }
> +
> + /* handle real device's MMIO/PIO BARs */
> + if (pt_register_regions(pci_dev->real_device.regions,
> + pci_dev->real_device.region_number,
pci_dev))
> + return NULL;
> +
> + /* handle interrupt routing */
> + e_device = (pci_dev->dev.devfn >> 3) & 0x1f;
> + e_intx = pci_dev->dev.config[0x3d] - 1;
> + pci_dev->intpin = e_intx;
> + pci_dev->run = 0;
> + pci_dev->girq = 0;
> + pci_dev->h_busnr = r_bus;
> + pci_dev->h_devfn = PCI_DEVFN(r_dev, r_func);
> +
> +#ifdef KVM_CAP_PCI_PASSTHROUGH
> + if (kvm_enabled()) {
> + struct kvm_pci_passthrough_dev pci_pt_dev;
> +
> + memset(&pci_pt_dev, 0, sizeof(pci_pt_dev));
> + pci_pt_dev.guest.busnr = pci_bus_num(e_bus);
> + pci_pt_dev.guest.devfn = PCI_DEVFN(e_device, r_func);
Why combine e_device and r_func? The guest devfn is e_devfn.
> + pci_pt_dev.host.busnr = pci_dev->h_busnr;
> + pci_pt_dev.host.devfn = pci_dev->h_devfn;
> +
> + /* We'll set the value of the guest irq as and when
> + * the piix config gets updated. See pci_pt_update_irq.
> + * The host irq field never gets used anyway
> + */
> +
> + rc = kvm_update_pci_pt_device(kvm_context, &pci_pt_dev);
> + if (rc < 0) {
> + fprintf(stderr, "Could not notify kernel about "
> + "passthrough device\n");
> + perror("pt-ioctl");
> + return NULL;
> + }
> + }
> +#endif
> +
> + fprintf(logfile, "Registered host PCI device %02x:%02x.%1x "
> + "as guest device %02x:%02x.%1x\n",
> + r_bus, r_dev, r_func,
> + pci_bus_num(e_bus), e_device, r_func);
Second "r_func" should replaced by e_devfn & 0x7.
Randy (Weidong)
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