From dbabe0687c5ba838b8fb90aae8264c34d14d499e Mon Sep 17 00:00:00 2001 From: Xiao Wang Date: Thu, 18 Jun 2015 06:11:44 +0200 Subject: [PATCH 08/20] virtio: introduce vector to virtqueues mapping Message-id: <1434607916-15166-9-git-send-email-jasowang@redhat.com> Patchwork-id: 66306 O-Subject: [RHEL7.2 qemu-kvm-rhev PATCH 08/20] virtio: introduce vector to virtqueues mapping Bugzilla: 1231610 RH-Acked-by: Stefan Hajnoczi RH-Acked-by: Vlad Yasevich RH-Acked-by: Michael S. Tsirkin Currently we will try to traverse all virtqueues to find a subset that using a specific vector. This is sub optimal when we will support hundreds or even thousands of virtqueues. So this patch introduces a method which could be used by transport to get all virtqueues that using a same vector. This is done through QLISTs and the number of QLISTs was queried through a transport specific method. When guest setting vectors, the virtqueue will be linked and helpers for traverse the list was also introduced. The first user will be virtio pci which will use this to speed up MSI-X masking and unmasking handling. Cc: Michael S. Tsirkin Signed-off-by: Jason Wang Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit e0d686bf4b9d018ba5449f057b486bb5e1fa1a0d) Signed-off-by: Miroslav Rezanina --- hw/virtio/virtio-pci.c | 8 ++++++++ hw/virtio/virtio.c | 36 ++++++++++++++++++++++++++++++++++-- include/hw/virtio/virtio-bus.h | 1 + include/hw/virtio/virtio.h | 3 +++ 4 files changed, 46 insertions(+), 2 deletions(-) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index aa34aa5..6b064b9 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -908,6 +908,13 @@ static const TypeInfo virtio_9p_pci_info = { * virtio-pci: This is the PCIDevice which has a virtio-pci-bus. */ +static int virtio_pci_query_nvectors(DeviceState *d) +{ + VirtIOPCIProxy *proxy = VIRTIO_PCI(d); + + return proxy->nvectors; +} + /* This is called by virtio-bus just after the device is plugged. */ static void virtio_pci_device_plugged(DeviceState *d) { @@ -1498,6 +1505,7 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, void *data) k->vmstate_change = virtio_pci_vmstate_change; k->device_plugged = virtio_pci_device_plugged; k->device_unplugged = virtio_pci_device_unplugged; + k->query_nvectors = virtio_pci_query_nvectors; } static const TypeInfo virtio_pci_bus_info = { diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 17c1260..6985e76 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -89,6 +89,7 @@ struct VirtQueue VirtIODevice *vdev; EventNotifier guest_notifier; EventNotifier host_notifier; + QLIST_ENTRY(VirtQueue) node; }; /* virt queue functions */ @@ -605,7 +606,7 @@ void virtio_reset(void *opaque) vdev->vq[i].vring.used = 0; vdev->vq[i].last_avail_idx = 0; vdev->vq[i].pa = 0; - vdev->vq[i].vector = VIRTIO_NO_VECTOR; + virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR); vdev->vq[i].signalled_used = 0; vdev->vq[i].signalled_used_valid = false; vdev->vq[i].notification = true; @@ -730,6 +731,16 @@ void virtio_queue_set_num(VirtIODevice *vdev, int n, int num) virtqueue_init(&vdev->vq[n]); } +VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector) +{ + return QLIST_FIRST(&vdev->vector_queues[vector]); +} + +VirtQueue *virtio_vector_next_queue(VirtQueue *vq) +{ + return QLIST_NEXT(vq, node); +} + int virtio_queue_get_num(VirtIODevice *vdev, int n) { return vdev->vq[n].vring.num; @@ -780,8 +791,19 @@ uint16_t virtio_queue_vector(VirtIODevice *vdev, int n) void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) { - if (n < VIRTIO_PCI_QUEUE_MAX) + VirtQueue *vq = &vdev->vq[n]; + + if (n < VIRTIO_PCI_QUEUE_MAX) { + if (vdev->vector_queues && + vdev->vq[n].vector != VIRTIO_NO_VECTOR) { + QLIST_REMOVE(vq, node); + } vdev->vq[n].vector = vector; + if (vdev->vector_queues && + vector != VIRTIO_NO_VECTOR) { + QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node); + } + } } VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, @@ -1088,6 +1110,7 @@ void virtio_cleanup(VirtIODevice *vdev) qemu_del_vm_change_state_handler(vdev->vmstate); g_free(vdev->config); g_free(vdev->vq); + g_free(vdev->vector_queues); } static void virtio_vmstate_change(void *opaque, int running, RunState state) @@ -1125,7 +1148,16 @@ void virtio_instance_init_common(Object *proxy_obj, void *data, void virtio_init(VirtIODevice *vdev, const char *name, uint16_t device_id, size_t config_size) { + BusState *qbus = qdev_get_parent_bus(DEVICE(vdev)); + VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); int i; + int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0; + + if (nvectors) { + vdev->vector_queues = + g_malloc0(sizeof(*vdev->vector_queues) * nvectors); + } + vdev->device_id = device_id; vdev->status = 0; vdev->isr = 0; diff --git a/include/hw/virtio/virtio-bus.h b/include/hw/virtio/virtio-bus.h index 0d2e7b4..a4588ca 100644 --- a/include/hw/virtio/virtio-bus.h +++ b/include/hw/virtio/virtio-bus.h @@ -62,6 +62,7 @@ typedef struct VirtioBusClass { * This is called by virtio-bus just before the device is unplugged. */ void (*device_unplugged)(DeviceState *d); + int (*query_nvectors)(DeviceState *d); /* * Does the transport have variable vring alignment? * (ie can it ever call virtio_queue_set_align()?) diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index d95f8b6..9706c29 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -84,6 +84,7 @@ struct VirtIODevice VMChangeStateEntry *vmstate; char *bus_name; uint8_t device_endian; + QLIST_HEAD(, VirtQueue) * vector_queues; }; typedef struct VirtioDeviceClass { @@ -218,6 +219,8 @@ void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign, bool set_handler); void virtio_queue_notify_vq(VirtQueue *vq); void virtio_irq(VirtQueue *vq); +VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector); +VirtQueue *virtio_vector_next_queue(VirtQueue *vq); static inline void virtio_add_feature(uint32_t *features, unsigned int fbit) { -- 1.8.3.1