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Bug 1035123 - Stable guest ABI doesn't check ram value of video
Summary: Stable guest ABI doesn't check ram value of video
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.0
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Ján Tomko
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1035134
TreeView+ depends on / blocked
 
Reported: 2013-11-27 06:42 UTC by tingting zheng
Modified: 2014-06-18 01:00 UTC (History)
7 users (show)

Fixed In Version: libvirt-1.1.1-14.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1035134 (view as bug list)
Environment:
Last Closed: 2014-06-13 12:45:28 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description tingting zheng 2013-11-27 06:42:40 UTC 
Description
Stable guest ABI doesn't check ram value of video

Version:
libvirt-1.1.1-13.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare a guest,set the Display as "Spice" and Video as "QXL".
2.Boot the guest.
3.Use virsh dumpxml to get the xml of the guest.
# virsh dumpxml mig > mig.xml

4.Change the ram value of video:eg:change ram from '65536' to '65535'
change xml from:
      <model type='qxl' ram='65536' vram='65536' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
to:
      <model type='qxl' ram='65535' vram='65536' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

5.Do migrate,no error shows.
# virsh migrate --live mig qemu+ssh://$ip/system --xml mig.xml

6.If I change vram value from xml,there is error.
# virsh migrate --live mig qemu+ssh://$ip/system --xml mig.xml
error: unsupported configuration: Target video card vram 65535 does not match source 65536

Actual results：
As step 5 describes.

Expected results:
Error shows when ram value in xml is set different with guest.
eg:error: unsupported configuration: Target video card ram 65535 does not match source 65536
Comment 2 Ján Tomko 2013-12-06 14:23:32 UTC 
Fixed upstream:
commit 952ab4c993b88a324c5910346efa4e75a72293b7
Author:     Ján Tomko <jtomko>
CommitDate: 2013-12-06 15:00:16 +0100

    Add qxl ram size to ABI stability check
    
    55bfd02 added a 'ram' attribute for qxl video devices
    but didn't update the ABI check.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1035123

git describe: v1.2.0-63-g952ab4c 

Downstream patch posted:
http://post-office.corp.redhat.com/archives/rhvirt-patches/2013-December/msg00097.html
Comment 4 tingting zheng 2013-12-11 05:50:36 UTC 
Tested PASS with:
libvirt-1.1.1-14.el7.x86_64

If I Change the ram value of video:eg:change ram from '65536' to '65535'
change xml from:
      <model type='qxl' ram='65536' vram='65536' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
to:
      <model type='qxl' ram='65535' vram='65536' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

Error will show when migrating with the updated xml file:
# virsh migrate --live mig qemu+ssh://10.66.5.7/system --xml mig.xml
error: unsupported configuration: Target video card ram 65535 does not match source 65536

Refer to the above comments,move the bug to VERIFIED.
Comment 5 Ludek Smid 2014-06-13 12:45:28 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

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