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Bug 1190956

Summary: libvirt should report an error or set default value when define/edit a vm have invalid vram or ram
Product: Red Hat Enterprise Linux 7 Reporter: Luyao Huang <lhuang>
Component: libvirtAssignee: Martin Kletzander <mkletzan>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: low Docs Contact:
Priority: low    
Version: 7.1CC: dyuan, mkletzan, mzhan, rbalakri
Target Milestone: rcKeywords: Upstream
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: libvirt-1.2.13-1.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-11-19 06:14:30 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:

Description Luyao Huang 2015-02-10 05:27:40 UTC 
description of problem:
libvirt should report an error or set default value when define/edit a vm have invalid vram or ram

Version-Release number of selected component (if applicable):
libvirt-1.2.8-16.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
 
1.edit vm graphics vram and ram as -1:
# virsh edit test4
    <video>
      <model type='qxl' ram='-1' vram='-1' vgamem='8192' heads='4294967295'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

2.check the xml and will get:

# virsh dumpxml test4 --inactive
    <video>
      <model type='qxl' vgamem='8192' heads='4294967295'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

3.start the vm (or edit it again) and these settings will auto add in config:
# virsh start test4
Domain test4 started

# virsh dumpxml test4 --inactive
    <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='4294967295'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

Actual results:
libvirt set these values to 0 in virDomainDeviceDefPostParseInternal
and will add the default value to them when call virDomainVideoDefParseXML

also found when try to set ram and vram to 0 will get the same result

Expected results:
libvirt should report an error or set default value when define/edit a vm have invalid vram or ram

Additional info:

however if we try to remove these settings(ram or vram), libvirt will auto add them for qxl video:
# virsh edit test4
    <video>
      <model type='qxl' vgamem='8192' heads='4294967295'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

# virsh dumpxml test4 --inactive
    <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='4294967295'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
Comment 1 Martin Kletzander 2015-02-10 08:51:30 UTC 
Fixed upstream with:

commit 3f9f4aa84f5f5986b91680a110eb72bf83fef95f
Author: Martin Kletzander <mkletzan>
Date:   Tue Feb 10 08:55:06 2015 +0100

    conf: disallow invalid values for video attributes
Comment 2 vivian zhang 2015-04-28 05:53:23 UTC 
I can produce this bug with build libvirt-1.2.8-16.el7.x86_64

verify it with build libvirt-1.2.14-1.el7.x86_64


1. edit guest xml ram and vram to negative value

...
 <video>
      <model type='qxl' ram='-1' vram='-1' vgamem='8192' heads='42949672'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...


    save it and report an error
# virsh edit rl
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]: 

2. edit guest xml vgamem to negative value

...

 <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='-1' heads='42949672'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...


# virsh edit rl
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]:

3. edit guest xml heads to negative value

...
 <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='-1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
..

error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]: 


4. try to reset with abc -99999999 !!$#%, get the same error

5. try to set with 0, dumpxml will get ram and vram with default 65536

# virsh dumpxml rl --inactive
...
<video>
      <model type='qxl' vgamem='8192' heads='42949672'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...

start guest and dumpxml again

# virsh dumpxml rl
...
<video>
      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='42949672'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...

6. set vram to 0 will get the vgamem default value 16384
# virsh dumpxml rl
...
 <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='42949672'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...
Comment 4 vivian zhang 2015-05-26 02:27:28 UTC 
I can produce this bug with build libvirt-1.2.8-16.el7.x86_64

Verify it with build libvirt-1.2.15-2.el7.x86_64

Steps:

1. edit guest xml ram and vram to negative value

...
 <video>
      <model type='qxl' ram='-1' vram='-1' vgamem='16384' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...


    save it and report an error
# virsh edit vm2
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]: 

2. edit guest xml vgamem to negative value

...

 <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='-1' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...


# virsh edit vm2
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]:

3. edit guest xml heads to negative value

...
 <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='-1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
..

error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]: 


4. try to reset with abc -99999999 !!$#%, get the same error

5. try to set with 0, dumpxml will get ram and vram with default 65536

# virsh dumpxml rl --inactive
...
<video>
      <model type='qxl' vgamem='8192' heads='42949672'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...

start guest and dumpxml again

# virsh dumpxml vm2
...
<video>
      <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='42949672'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...

6. set vram to 0 will get the vgamem default value 16384
# virsh dumpxml vm2
...
 <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='42949672'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
...

move to verified
Comment 6 errata-xmlrpc 2015-11-19 06:14:30 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/RHBA-2015-2202.html