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Re: [Qemu-devel] [RFC-v2 0/6] vhost-scsi: Add support for host virtualiz
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [RFC-v2 0/6] vhost-scsi: Add support for host virtualized target |
Date: |
Mon, 13 Aug 2012 12:04:00 +0300 |
On Mon, Aug 13, 2012 at 08:35:11AM +0000, Nicholas A. Bellinger wrote:
> From: Nicholas Bellinger <address@hidden>
>
> Hi Paolo, Stefan, & QEMU folks,
>
> The following is the second RFC series for vhost-scsi patches against mainline
> QEMU v1.1.0. The series is available from the following working branch:
>
> git://git.kernel.org/pub/scm/virt/kvm/nab/qemu-kvm.git vhost-scsi-merge
>
> Apologies for the delayed follow-up on this series. The changes detailed
> below
> addresses Paolo's original comments on vhost-scsi code from the last weeks.
Looks good overall. I sent some comments on list.
Thanks!
> As of this evening the tcm_vhost driver has now been merged into the mainline
> kernel for 3.6-rc2 here:
>
> tcm_vhost: Initial merge for vhost level target fabric driver
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=057cbf49a1f08297877
>
> Also, after following up on the qemu-kvm IRQ injection changes (from Jan) that
> caused a performance regerssion with QEMU 1.1.0 code originally reported here:
>
> vhost-scsi port to v1.1.0 + MSI-X performance regression
> http://comments.gmane.org/gmane.linux.scsi.target.devel/2277
>
> It turns out that setting explict virtio-queue IRQ affinity within guest
> appears
> to bring small block random IOPs performance back up to the pre IRQ injection
> conversion levels. I'm not sure why this ended up making so much of a
> difference
> post IRQ injection conversion, but setting virtio-queue affinity is now
> getting
> us back to pre IQN injection conversion levels.
>
> Changes from v1 -> v2:
>
> - Expose ABI version via VHOST_SCSI_GET_ABI_VERSION + use Rev 0 as
> starting point for v3.6-rc code (Stefan + ALiguori + nab)
> - Fix upstream qemu conflict in hw/qdev-properties.c
> - Make GET_ABI_VERSION use int (nab + mst)
> - Drop unnecessary event-notifier changes (nab)
> - Fix vhost-scsi case lables in configure (reported by paolo)
> - Convert qdev_prop_vhost_scsi to use ->get() + ->set() following
> qdev_prop_netdev (reported by paolo)
> - Fix typo in qemu-options.hx definition of vhost-scsi (reported by paolo)
> - Squash virtio-scsi: use the vhost-scsi host device from stefan (nab)
> - Fix up virtio_scsi_properties[] conflict w/ upstream qemu (nab)
> - Drop usage of to_virtio_scsi() in virtio_scsi_set_status()
> (reported by paolo)
> - Use modern VirtIOSCSIConf define in virtio-scsi.h (reported by paolo)
> - Use s->conf->vhost_scsi instead of proxyconf->vhost_scsi in
> virtio_scsi_init() (reported by paolo)
> - Only register QEMU SCSI bus is vhost-scsi is not active (reported by paolo)
> - Fix incorrect VirtIOSCSI->cmd_vqs[0] definition (nab)
>
> Please have another look, and let me know if anything else needs to be
> addressed.
>
> Thanks!
>
> --nab
>
> Nicholas Bellinger (3):
> msix: Work-around for vhost-scsi with KVM in-kernel MSI injection
> virtio-scsi: Set max_target=0 during vhost-scsi operation
> virtio-scsi: Fix incorrect VirtIOSCSI->cmd_vqs[0] definition
>
> Stefan Hajnoczi (3):
> vhost: Pass device path to vhost_dev_init()
> vhost-scsi: add -vhost-scsi host device for use with tcm-vhost
> virtio-scsi: Add start/stop functionality for vhost-scsi
>
> configure | 10 +++
> hw/Makefile.objs | 1 +
> hw/msix.c | 3 +
> hw/qdev-properties.c | 40 ++++++++++++
> hw/qdev.h | 3 +
> hw/vhost-scsi.c | 170
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> hw/vhost-scsi.h | 50 +++++++++++++++
> hw/vhost.c | 5 +-
> hw/vhost.h | 3 +-
> hw/vhost_net.c | 2 +-
> hw/virtio-pci.c | 1 +
> hw/virtio-scsi.c | 56 ++++++++++++++++-
> hw/virtio-scsi.h | 1 +
> qemu-common.h | 1 +
> qemu-config.c | 16 +++++
> qemu-options.hx | 4 +
> vl.c | 18 +++++
> 17 files changed, 378 insertions(+), 6 deletions(-)
> create mode 100644 hw/vhost-scsi.c
> create mode 100644 hw/vhost-scsi.h
>
> --
> 1.7.2.5
- Re: [Qemu-devel] [RFC-v2 3/6] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost, (continued)
Re: [Qemu-devel] [RFC-v2 3/6] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost, Michael S. Tsirkin, 2012/08/13
Re: [Qemu-devel] [RFC-v2 3/6] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost, Blue Swirl, 2012/08/13
Re: [Qemu-devel] [RFC-v2 3/6] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost, Paolo Bonzini, 2012/08/20
Re: [Qemu-devel] [RFC-v2 0/6] vhost-scsi: Add support for host virtualized target,
Michael S. Tsirkin <=