Bug 1095645

Summary: vectors of virtio-scsi-pci will be 0 when set vectors>=129
Product: Red Hat Enterprise Linux 7 Reporter: Jun Li <juli>
Component: qemu-kvmAssignee: Fam Zheng <famz>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: low Docs Contact:
Priority: low    
Version: 7.0CC: chayang, hhuang, juzhang, michen, rbalakri, sluo, virt-maint, xfu
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: qemu-kvm-1.5.3-67.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 1143825 (view as bug list) Environment:
Last Closed: 2015-03-05 08:06:59 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1143825    

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