a4eef0711b
Automatically size the number of request virtqueues to match the number of vCPUs. This ensures that completion interrupts are handled on the same vCPU that submitted the request. No IPI is necessary to complete an I/O request and performance is improved. The maximum number of MSI-X vectors and virtqueues limit are respected. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Message-Id: <20200818143348.310613-8-stefanha@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
109 lines
3.4 KiB
C
109 lines
3.4 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 (dev->vdev.num_queues == VHOST_USER_BLK_AUTO_NUM_QUEUES) {
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dev->vdev.num_queues = virtio_pci_optimal_num_queues(0);
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}
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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_realize(vdev, BUS(&vpci_dev->bus), 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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