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Bug 2036300 - video heads can be configured for 'bochs_display' even max_outputs is not supported
Summary: video heads can be configured for 'bochs_display' even max_outputs is not sup...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: libvirt
Version: 9.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Peter Krempa
QA Contact: Lili Zhu
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-12-31 04:13 UTC by Lili Zhu
Modified: 2022-11-15 10:36 UTC (History)
6 users (show)

Fixed In Version: libvirt-8.1.0-1.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-11-15 10:03:03 UTC
Type: Bug
Target Upstream Version: 8.1.0
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-106687 0 None None None 2021-12-31 04:17:56 UTC
Red Hat Product Errata RHSA-2022:8003 0 None None None 2022-11-15 10:03:22 UTC

Description Lili Zhu 2021-12-31 04:13:14 UTC 
Description of problem:
video heads configured even max_outputs is not supported 


Version-Release number of selected component (if applicable):
libvirt-7.10.0-1.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. prepare a guest with the following xml
...
   <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <audio id='1' type='none'/>
    <video>
      <model type='bochs' vram='16384' heads='5' primary='yes'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/>
    </video>
...

2. start the guest
# virsh start avocado-vt-vm1
Domain 'avocado-vt-vm1' started

3. check the qemu cmd line
-device {"driver":"bochs-display","id":"video0","vgamem":16777216,"bus":"pcie.0","addr":"0x1"} 
(no max_outputs shown here)
 

Expected results:
Multi screens are only supported with spice+qxl and spice+virtio. When the graphics and video types do not support multi screens, should report error when define or start such guests

Additional info:
Comment 1 Peter Krempa 2022-01-19 15:59:47 UTC 
Fixed upstream:

commit 1652babf15cea63323411c450c408848f96e5866
Author: Peter Krempa <pkrempa>
Date:   Tue Jan 18 16:59:35 2022 +0100

    qemuValidateDomainDeviceDefVideo: Reject non-default video head count for devices not supporting it
    
    Only QXL and virtio-vga actually propagate the 'heads' attribute as
    'max_outputs' to the commandline of qemu. Reject the setting when
    non-default value is used for any other video type.
    
    Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2036300
    Signed-off-by: Peter Krempa <pkrempa>
    Reviewed-by: Ján Tomko <jtomko>

v8.0.0-109-g1652babf15
Comment 2 Lili Zhu 2022-03-19 14:24:32 UTC 
Tested with:
libvirt-daemon-8.2.0-1.fc35.x86_64

Tried to define a guest with the following xml snippet
  <video>
      <model type='bochs' heads='4'/>
      <alias name='video0'/>
    </video>

# virsh define avocado-vt-vm1.xml
error: Failed to define domain from avocado-vt-vm1.xml
error: unsupported configuration: video type 'bochs' doesn't support multiple 'heads'

Also tested with cirrus, vga, ramfb types, also reported the similar error.
Comment 5 Lili Zhu 2022-05-03 11:01:53 UTC 
Verify this bug with:
libvirt-8.2.0-1.el9.x86_64

The verification steps are the same with that in Comment #2

As the testing result matches with the expected result, mark the bug as verified.
Comment 7 errata-xmlrpc 2022-11-15 10:03:03 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 (Low: libvirt security, bug fix, and enhancement update), 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://access.redhat.com/errata/RHSA-2022:8003
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