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[Qemu-devel] [PATCH V3 00/14] Support more virtio queues
From: |
Jason Wang |
Subject: |
[Qemu-devel] [PATCH V3 00/14] Support more virtio queues |
Date: |
Thu, 5 Mar 2015 13:48:37 +0800 |
We current limit the max virtio queues to 64. This is not sufficient
to support multiqueue deivces (e.g recent Linux support up to 256
tap queues). So this series try to let virtio to support more queues.
No much works need to be done except:
- Patch 1 add a check to validate the queues supported by backend
against the virtio queue limitation
- Patch 2 fixes a bug in virtio_del_queue()
- Patch 3 introdues a bus specific queue limitation
- Patch 4 - Patch 8 let each transport to use bus specific queue
limitation instead of VIRTIO_PCI_QUEUE_MAX
- Patch 9 introduces a map from vector to queues that use this vector
- Patch 10 introduces a helpr for get the queue index
- Patch 11 speedups the MSI-X masking and unmasking through the vector
to queues mapping that introduced by Patch 9
- Patch 12 increase the maximum number of queues supported by
virtio-pci from 64 to 513, and deal with the migration compatibility
with the changes.
- Patch 13 tries to remove the hard coded MSI-X bar size (4096) and
allow up to 2048 MSI-X entries.
- Patch 14 add a boolean property to let the virtio-net can calculate
the MSI-X bar size based on the number of MSI-X vectors and keep
migration compatibility with legacy version whose bar size is 4096.
With this patch, we can support up to 256 queues. Since x86 can only
allow about 240 interrupt vectors for MSI-X, current Linux driver can
only have about 80 queue pairs has their private MSI-X interrupt
vectors. With sharing IRQ with queue pairs (RFC posted in
https://lkml.org/lkml/2014/12/25/169), Linux driver can have up
to about 186 queue pairs has their private MSI-X interrupt vectors.
Stress/migration test on virtio-pci, compile test/make check on
s390x-softmmu.
Cc: Paolo Bonzini <address@hidden>
Cc: Richard Henderson <address@hidden>
Cc: Anthony Liguori <address@hidden>
Cc: Michael S. Tsirkin <address@hidden>
Cc: Alexander Graf <address@hidden>
Cc: Keith Busch <address@hidden>
Cc: Kevin Wolf <address@hidden>
Cc: Stefan Hajnoczi <address@hidden>
Cc: Anthony Liguori <address@hidden>
Cc: Christian Borntraeger <address@hidden>
Cc: Cornelia Huck <address@hidden>
Cc: Amit Shah <address@hidden>
Please review
Thanks
Changes from V2:
- Move transport specific limitation to their implementation. (The
left is VIRTIO_CCW_QUEUE_MAX since I fail to find a common header
files other than virtio.h)
- Use virtio_get_queue_max() if possbile in virtio.c
- AdapterRoutes should use ccw limit
- Introduce a vector to queue mapping for virito devices and speedup
the MSI-X masking and unmasking through this.
Changes from V1:
- add a validation against the bus limitation
- switch to use a bus specific queue limit instead of a global one,
this will allow us to just increase the limit of one transport
without disturbing others.
- only increase the queue limit of virtio-pci
- limit the maximum number of virtio queues to 64 for legacy machine
types
Jason Wang (14):
virtio-net: validate backend queue numbers against bus limitation
virtio-net: fix the upper bound when trying to delete queues
virito: introduce bus specific queue limit
virtio-ccw: introduce ccw specific queue limit
virtio-s390: switch to bus specific queue limit
virtio-serial-bus: switch to bus specific queue limit
virtio-mmio: switch to bus specific queue limit
virtio-pci: switch to use bus specific queue limit
virtio: introduce vector to virtqueues mapping
virtio: introduce virtio_queue_get_index()
virtio-pci: speedup MSI-X masking and unmasking
virtio-pci: increase the maximum number of virtqueues to 513
pci: remove hard-coded bar size in msix_init_exclusive_bar()
virtio-pci: introduce auto_msix_bar_size property
hw/block/nvme.c | 2 +-
hw/char/virtio-serial-bus.c | 4 ++-
hw/i386/pc_piix.c | 10 ++++++
hw/i386/pc_q35.c | 9 +++++
hw/misc/ivshmem.c | 2 +-
hw/net/virtio-net.c | 9 ++++-
hw/pci/msix.c | 18 ++++------
hw/ppc/spapr.c | 5 +++
hw/s390x/s390-virtio-bus.c | 7 ++--
hw/s390x/s390-virtio-ccw.c | 7 ++--
hw/s390x/virtio-ccw.c | 12 ++++---
hw/scsi/virtio-scsi.c | 4 +--
hw/virtio/virtio-mmio.c | 7 ++--
hw/virtio/virtio-pci.c | 78 ++++++++++++++++++++++++++++--------------
hw/virtio/virtio-pci.h | 3 ++
hw/virtio/virtio.c | 74 ++++++++++++++++++++++++++++++---------
include/hw/compat.h | 8 +++++
include/hw/pci/msix.h | 2 +-
include/hw/s390x/s390_flic.h | 2 +-
include/hw/virtio/virtio-bus.h | 2 ++
include/hw/virtio/virtio.h | 7 +++-
21 files changed, 199 insertions(+), 73 deletions(-)
--
2.1.0
- [Qemu-devel] [PATCH V3 00/14] Support more virtio queues,
Jason Wang <=
- [Qemu-devel] [PATCH V3 01/14] virtio-net: validate backend queue numbers against bus limitation, Jason Wang, 2015/03/05
- [Qemu-devel] [PATCH V3 02/14] virtio-net: fix the upper bound when trying to delete queues, Jason Wang, 2015/03/05
- [Qemu-devel] [PATCH V3 03/14] virito: introduce bus specific queue limit, Jason Wang, 2015/03/05
- [Qemu-devel] [PATCH V3 04/14] virtio-ccw: introduce ccw specific queue limit, Jason Wang, 2015/03/05
- [Qemu-devel] [PATCH V3 05/14] virtio-s390: switch to bus specific queue limit, Jason Wang, 2015/03/05
- [Qemu-devel] [PATCH V3 06/14] virtio-serial-bus: switch to bus specific queue limit, Jason Wang, 2015/03/05