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[RFC v3 13/19] vfio-user: pci_user_realize PCI setup
From: |
John Johnson |
Subject: |
[RFC v3 13/19] vfio-user: pci_user_realize PCI setup |
Date: |
Mon, 8 Nov 2021 16:46:41 -0800 |
PCI BARs read from remote device
PCI config reads/writes sent to remote server
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@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
- [RFC v3 00/19] vfio-user client, John Johnson, 2021/11/08
- [RFC v3 13/19] vfio-user: pci_user_realize PCI setup,
John Johnson <=
- [RFC v3 11/19] vfio-user: get region info, John Johnson, 2021/11/08
- [RFC v3 06/19] vfio-user: Define type vfio_user_pci_dev_info, John Johnson, 2021/11/08
- [RFC v3 04/19] Add device IO ops vector, John Johnson, 2021/11/08
- [RFC v3 09/19] vfio-user: define socket send functions, John Johnson, 2021/11/08
- [RFC v3 03/19] Add container IO ops vector, John Johnson, 2021/11/08
- [RFC v3 02/19] vfio-user: add VFIO base abstract class, John Johnson, 2021/11/08