Re: [Qemu-devel] [PATCH V2 0/8] virtio 1.0 pci optimizations and fixes

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Sep 02, 2015 at 11:25:17AM +0800, Jason Wang wrote:
> Hi all:
> 
> This series tries to fix the following issues:
> 
> - qemu abort when trying to adjust endianness for zero length eventfd,
>   this prevent fast mmio eventfd from being used in ppc. Fixing by
>   skip the endianness adjustment for zero length eventfd.
> - 1.0 mmio is slow since it was using datamatch eventfd. Fixing this
>   by usinng wildcard mmio eventfd, then we could get speed up through
>   kernel fast mmio bus on ept capable machine.
> - 1.0 mmio is slow compared to pio (at least on some
>   archs/setups). Fixing this by re-introducing pio notification
>   capability. This will be useful for the arch/setups that fast mmio
>   does not work.
> - Some virtio pci 1.0 fields were not migrated. This will cause
>   unexpected behaviour if migrate during driver initialization. Fixing
>   this by introduce a transport specific callback and get/put
>   transport specific fields for virtio 1.0.
> - queue_enable read was broken. Fixing by set the queue_enable to true
>   during guest write and clear it during reset.
> 
> Please review.
> Thanks

Wanted to merge this, but it needs to be rebased to latest master.
Pls do, and repost.

> Changes from V1:
> - skip zero length eventfd endianness adjustment
> - don't use pci specific name ("modern") in virtio core, using "extra"
>   instead and in virtio pci callback, using subsections which could
>   allow us to extend the future improvement without changing the core.
> - don't check virtio_virtqueue_needed() in virtio_extra_state_needed()
> - drop the ppc 2.5 machine type patch
> - squash Eduardo's 2.5 machine type patches into this series
> 
> Eduardo Habkost (3):
>   q35: Move options common to all classes to pc_q35_machine_options()
>   q35: Move options common to all classes to pc_i440fx_machine_options()
>   pc: Introduce pc-*-2.5 machine classes
> 
> Jason Wang (5):
>   virtio-pci: fix 1.0 virtqueue migration
>   memory: don't try to adjust endianness for zero length eventfd
>   virtio-pci: use wildcard mmio eventfd for 1.0 notification cap
>   virtio-pci: introduce pio notification capability for modern device
>   virtio-pci: unbreak queue_enable read
> 
>  hw/i386/pc_piix.c              |  18 ++-
>  hw/i386/pc_q35.c               |  20 +++-
>  hw/virtio/virtio-pci.c         | 266 +++++++++++++++++++++++++++++++++++++----
>  hw/virtio/virtio-pci.h         |  30 +++--
>  hw/virtio/virtio.c             |  57 +++++++++
>  include/hw/compat.h            |   7 ++
>  include/hw/i386/pc.h           |   4 +
>  include/hw/virtio/virtio-bus.h |   3 +
>  memory.c                       |   8 +-
>  9 files changed, 375 insertions(+), 38 deletions(-)
> 
> -- 
> 2.1.4