PCI BARs read from remote device PCI config reads/writes sent to remote server
Signed-off-by: Elena Ufimtseva <elena.ufimts...@oracle.com> Signed-off-by: John G Johnson <john.g.john...@oracle.com> Signed-off-by: Jagannathan Raman <jag.ra...@oracle.com> --- hw/vfio/pci.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 88 insertions(+), 1 deletion(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index d5f9987..f8729b2 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -3551,8 +3551,93 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Error **errp) goto error; } + /* Get a copy of config space */ + ret = VDEV_REGION_READ(vbasedev, VFIO_PCI_CONFIG_REGION_INDEX, 0, + MIN(pci_config_size(pdev), vdev->config_size), + pdev->config); + if (ret < (int)MIN(pci_config_size(&vdev->pdev), vdev->config_size)) { + error_setg_errno(errp, -ret, "failed to read device config space"); + goto error; + } + + /* vfio emulates a lot for us, but some bits need extra love */ + vdev->emulated_config_bits = g_malloc0(vdev->config_size); + + /* QEMU can choose to expose the ROM or not */ + memset(vdev->emulated_config_bits + PCI_ROM_ADDRESS, 0xff, 4); + /* QEMU can also add or extend BARs */ + memset(vdev->emulated_config_bits + PCI_BASE_ADDRESS_0, 0xff, 6 * 4); + vdev->vendor_id = pci_get_word(pdev->config + PCI_VENDOR_ID); + vdev->device_id = pci_get_word(pdev->config + PCI_DEVICE_ID); + + /* QEMU can change multi-function devices to single function, or reverse */ + vdev->emulated_config_bits[PCI_HEADER_TYPE] = + PCI_HEADER_TYPE_MULTI_FUNCTION; + + /* Restore or clear multifunction, this is always controlled by QEMU */ + if (vdev->pdev.cap_present & QEMU_PCI_CAP_MULTIFUNCTION) { + vdev->pdev.config[PCI_HEADER_TYPE] |= PCI_HEADER_TYPE_MULTI_FUNCTION; + } else { + vdev->pdev.config[PCI_HEADER_TYPE] &= ~PCI_HEADER_TYPE_MULTI_FUNCTION; + } + + /* + * Clear host resource mapping info. If we choose not to register a + * BAR, such as might be the case with the option ROM, we can get + * confusing, unwritable, residual addresses from the host here. + */ + memset(&vdev->pdev.config[PCI_BASE_ADDRESS_0], 0, 24); + memset(&vdev->pdev.config[PCI_ROM_ADDRESS], 0, 4); + + vfio_pci_size_rom(vdev); + + vfio_bars_prepare(vdev); + + vfio_msix_early_setup(vdev, &err); + if (err) { + error_propagate(errp, err); + goto error; + } + + vfio_bars_register(vdev); + + ret = vfio_add_capabilities(vdev, errp); + if (ret) { + goto out_teardown; + } + + /* QEMU emulates all of MSI & MSIX */ + if (pdev->cap_present & QEMU_PCI_CAP_MSIX) { + memset(vdev->emulated_config_bits + pdev->msix_cap, 0xff, + MSIX_CAP_LENGTH); + } + + if (pdev->cap_present & QEMU_PCI_CAP_MSI) { + memset(vdev->emulated_config_bits + pdev->msi_cap, 0xff, + vdev->msi_cap_size); + } + + if (vdev->pdev.config[PCI_INTERRUPT_PIN] != 0) { + vdev->intx.mmap_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, + vfio_intx_mmap_enable, vdev); + pci_device_set_intx_routing_notifier(&vdev->pdev, + vfio_intx_routing_notifier); + vdev->irqchip_change_notifier.notify = vfio_irqchip_change; + kvm_irqchip_add_change_notifier(&vdev->irqchip_change_notifier); + ret = vfio_intx_enable(vdev, errp); + if (ret) { + goto out_deregister; + } + } + return; +out_deregister: + pci_device_set_intx_routing_notifier(&vdev->pdev, NULL); + kvm_irqchip_remove_change_notifier(&vdev->irqchip_change_notifier); +out_teardown: + vfio_teardown_msi(vdev); + vfio_bars_exit(vdev); error: vfio_user_disconnect(proxy); error_prepend(errp, VFIO_MSG_PREFIX, vdev->vbasedev.name); @@ -3565,7 +3650,9 @@ static void vfio_user_instance_finalize(Object *obj) vfio_put_device(vdev); - vfio_user_disconnect(vbasedev->proxy); + if (vbasedev->proxy != NULL) { + vfio_user_disconnect(vbasedev->proxy); + } } static Property vfio_user_pci_dev_properties[] = { -- 1.8.3.1