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Bug 1095645 - vectors of virtio-scsi-pci will be 0 when set vectors>=129
Summary: vectors of virtio-scsi-pci will be 0 when set vectors>=129
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: x86_64
OS: Linux
low
low
Target Milestone: rc
: ---
Assignee: Fam Zheng
QA Contact: Virtualization Bugs
URL:
Whiteboard:
: 1099277 (view as bug list)
Depends On:
Blocks: 1143825
TreeView+ depends on / blocked
 
Reported: 2014-05-08 09:28 UTC by Jun Li
Modified: 2015-03-05 08:06 UTC (History)
8 users (show)

Fixed In Version: qemu-kvm-1.5.3-67.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1143825 (view as bug list)
Environment:
Last Closed: 2015-03-05 08:06:59 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0349 0 normal SHIPPED_LIVE Important: qemu-kvm security, bug fix, and enhancement update 2015-03-05 12:27:34 UTC

Description Jun Li 2014-05-08 09:28:16 UTC 
Description of problem:
vectors of virtio-scsi-pci will be 0 when set vectors>=129.

Version-Release number of selected component (if applicable):
3.10.0-123.el7.x86_64
qemu-kvm-1.5.3-60.el7_0.2.x86_64

How reproducible:
100%

Steps to Reproduce:
1.boot qemu-kvm with following cli:
# /usr/libexec/qemu-kvm -device virtio-scsi-pci,id=scsi0,vectors=129 -monitor stdio -nodefaults
2.using "info qtree" to check the value of vectors of virtio-scsi-pci.
(qemu)info qtree
3.

Actual results:
vector of virtio-scsi-pci will be 0.

Expected results:
If vectors need <=128, when boot qemu-kvm with vectors >=129, could give some hints. Just like when set vectors with 10000000000, qemu-kvm will give hints like followings:
# /usr/libexec/qemu-kvm -device virtio-scsi-pci,id=scsi0,vectors=10000000000 -monitor stdio -nodefaults
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) qemu-kvm: -device virtio-scsi-pci,id=scsi0,vectors=10000000000: Parameter 'vectors' expects uint32_t

Additional info:
Comment 2 Amos Kong 2014-08-04 06:52:34 UTC 
*** Bug 1099277 has been marked as a duplicate of this bug. ***
Comment 3 Jeff Nelson 2014-08-08 16:55:04 UTC 
Fix included in qemu-kvm-1.5.3-67.el7
Comment 5 Chao Yang 2014-10-27 09:52:17 UTC 
Reproduced with qemu-kvm-1.5.3-60.el7.x86_64.rpm. Same step as reporter.

Actual Result:
# /usr/libexec/qemu-kvm -device virtio-scsi-pci,id=scsi0,vectors=129 -monitor stdio -nodefaults
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) VNC server running on `::1:5900'

(qemu) info qtree 
bus: main-system-bus
  type System
  dev: kvm-ioapic, id ""
    gpio-in 24
    gsi_base = 0
    irq 0
    mmio 00000000fec00000/0000000000001000
  dev: i440FX-pcihost, id ""
    pci-hole64-size = 16777216.000T
    irq 0
    bus: pci.0
      type PCI
      dev: virtio-scsi-pci, id "scsi0"
        ioeventfd = on
        vectors = 0
                ^^^


Verified pass with qemu-kvm-1.5.3-77.el7.x86_64.rpm. It complaint failure to initialize NO. of vectors greater than 128.

Actual Result:
# /usr/libexec/qemu-kvm -device virtio-scsi-pci,id=scsi0,vectors=129 -monitor stdio -nodefaults
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) qemu-kvm: -device virtio-scsi-pci,id=scsi0,vectors=129: unable to init 
                                                               ^^^^^^^^^^^^^^
msix vectors to 129
^^^^^^^^^^^^^^^^^^^
VNC server running on `::1:5900'

(qemu) info qtree
bus: main-system-bus
  type System
  dev: kvm-ioapic, id ""
    gpio-in 24
    gsi_base = 0
    irq 0
    mmio 00000000fec00000/0000000000001000
  dev: i440FX-pcihost, id ""
    pci-hole64-size = 16777216.000T
    irq 0
    bus: pci.0
      type PCI
      dev: virtio-scsi-pci, id "scsi0"
        ioeventfd = on
        vectors = 0


As per above, this issue has fixed correctly.
Comment 8 errata-xmlrpc 2015-03-05 08:06:59 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0349.html
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