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a9f98bb5eb
This patch lets vhost support multiqueue. The idea is simple, just launching
multiple threads of vhost and let each of vhost thread processing a subset of
the virtqueues of the device. After this change each emulated device can have
multiple vhost threads as its backend.
To do this, a virtqueue index were introduced to record to first virtqueue that
will be handled by this vhost_net device. Based on this and nvqs, vhost could
calculate its relative index to setup vhost_net device.
Since we may have many vhost/net devices for a virtio-net device. The setting of
guest notifiers were moved out of the starting/stopping of a specific vhost
thread. The vhost_net_{start|stop}() were renamed to
vhost_net_{start|stop}_one(), and a new vhost_net_{start|stop}() were introduced
to configure the guest notifiers and start/stop all vhost/vhost_net devices.
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
#ifndef VHOST_H
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#define VHOST_H
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#include "hw/hw.h"
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#include "hw/virtio.h"
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#include "exec/memory.h"
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/* Generic structures common for any vhost based device. */
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struct vhost_virtqueue {
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int kick;
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int call;
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void *desc;
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void *avail;
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void *used;
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int num;
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unsigned long long used_phys;
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unsigned used_size;
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void *ring;
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unsigned long long ring_phys;
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unsigned ring_size;
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EventNotifier masked_notifier;
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};
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typedef unsigned long vhost_log_chunk_t;
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#define VHOST_LOG_PAGE 0x1000
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#define VHOST_LOG_BITS (8 * sizeof(vhost_log_chunk_t))
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#define VHOST_LOG_CHUNK (VHOST_LOG_PAGE * VHOST_LOG_BITS)
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struct vhost_memory;
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struct vhost_dev {
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MemoryListener memory_listener;
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int control;
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struct vhost_memory *mem;
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int n_mem_sections;
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MemoryRegionSection *mem_sections;
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struct vhost_virtqueue *vqs;
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int nvqs;
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/* the first virtuque which would be used by this vhost dev */
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int vq_index;
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unsigned long long features;
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unsigned long long acked_features;
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unsigned long long backend_features;
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bool started;
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bool log_enabled;
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vhost_log_chunk_t *log;
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unsigned long long log_size;
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bool force;
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};
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int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
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bool force);
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void vhost_dev_cleanup(struct vhost_dev *hdev);
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bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev);
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int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev);
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void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev);
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int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
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void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev);
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/* Test and clear masked event pending status.
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* Should be called after unmask to avoid losing events.
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*/
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bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n);
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/* Mask/unmask events from this vq.
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*/
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void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
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bool mask);
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#endif
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