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d2623129a7
The only way object_property_add() can fail is when a property with the same name already exists. Since our property names are all hardcoded, failure is a programming error, and the appropriate way to handle it is passing &error_abort. Same for its variants, except for object_property_add_child(), which additionally fails when the child already has a parent. Parentage is also under program control, so this is a programming error, too. We have a bit over 500 callers. Almost half of them pass &error_abort, slightly fewer ignore errors, one test case handles errors, and the remaining few callers pass them to their own callers. The previous few commits demonstrated once again that ignoring programming errors is a bad idea. Of the few ones that pass on errors, several violate the Error API. The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. ich9_pm_add_properties(), sparc32_ledma_realize(), sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize() are wrong that way. When the one appropriate choice of argument is &error_abort, letting users pick the argument is a bad idea. Drop parameter @errp and assert the preconditions instead. There's one exception to "duplicate property name is a programming error": the way object_property_add() implements the magic (and undocumented) "automatic arrayification". Don't drop @errp there. Instead, rename object_property_add() to object_property_try_add(), and add the obvious wrapper object_property_add(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-15-armbru@redhat.com> [Two semantic rebase conflicts resolved]
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*
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* Vhost user blk PCI Bindings
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*
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* Copyright(C) 2017 Intel Corporation.
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*
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* Authors:
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* Changpeng Liu <changpeng.liu@intel.com>
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*
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* Largely based on the "vhost-user-scsi.c" and "vhost-scsi.c" implemented by:
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* Felipe Franciosi <felipe@nutanix.com>
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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* Nicholas Bellinger <nab@risingtidesystems.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "standard-headers/linux/virtio_pci.h"
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#include "hw/virtio/virtio.h"
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#include "hw/virtio/vhost-user-blk.h"
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#include "hw/pci/pci.h"
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#include "hw/qdev-properties.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "virtio-pci.h"
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typedef struct VHostUserBlkPCI VHostUserBlkPCI;
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/*
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* vhost-user-blk-pci: This extends VirtioPCIProxy.
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*/
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#define TYPE_VHOST_USER_BLK_PCI "vhost-user-blk-pci-base"
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#define VHOST_USER_BLK_PCI(obj) \
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OBJECT_CHECK(VHostUserBlkPCI, (obj), TYPE_VHOST_USER_BLK_PCI)
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struct VHostUserBlkPCI {
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VirtIOPCIProxy parent_obj;
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VHostUserBlk vdev;
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};
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static Property vhost_user_blk_pci_properties[] = {
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DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
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DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
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DEV_NVECTORS_UNSPECIFIED),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vhost_user_blk_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
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{
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VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(vpci_dev);
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DeviceState *vdev = DEVICE(&dev->vdev);
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if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
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vpci_dev->nvectors = dev->vdev.num_queues + 1;
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}
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qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
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object_property_set_bool(OBJECT(vdev), true, "realized", errp);
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}
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static void vhost_user_blk_pci_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
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PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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device_class_set_props(dc, vhost_user_blk_pci_properties);
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k->realize = vhost_user_blk_pci_realize;
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pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
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pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
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pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
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pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
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}
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static void vhost_user_blk_pci_instance_init(Object *obj)
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{
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VHostUserBlkPCI *dev = VHOST_USER_BLK_PCI(obj);
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virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
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TYPE_VHOST_USER_BLK);
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object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
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"bootindex");
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}
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static const VirtioPCIDeviceTypeInfo vhost_user_blk_pci_info = {
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.base_name = TYPE_VHOST_USER_BLK_PCI,
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.generic_name = "vhost-user-blk-pci",
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.transitional_name = "vhost-user-blk-pci-transitional",
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.non_transitional_name = "vhost-user-blk-pci-non-transitional",
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.instance_size = sizeof(VHostUserBlkPCI),
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.instance_init = vhost_user_blk_pci_instance_init,
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.class_init = vhost_user_blk_pci_class_init,
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};
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static void vhost_user_blk_pci_register(void)
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{
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virtio_pci_types_register(&vhost_user_blk_pci_info);
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}
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type_init(vhost_user_blk_pci_register)
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