Bug 1643404

Summary:	[RFE] add Support for bochs-display
Product:	Red Hat Enterprise Linux Advanced Virtualization	Reporter:	Gerd Hoffmann <kraxel>
Component:	libvirt	Assignee:	Jonathon Jongsma <jjongsma>
Status:	CLOSED ERRATA	QA Contact:	yafu <yafu>
Severity:	unspecified	Docs Contact:
Priority:	medium
Version:	8.1	CC:	chhu, dyuan, fjin, jdenemar, jsuchane, knoel, xuzhang, yalzhang
Target Milestone:	rc	Keywords:	FutureFeature
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libvirt-5.6.0-1.el8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-06 07:12:03 UTC	Type:	Feature Request
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Gerd Hoffmann 2018-10-26 07:59:22 UTC

Description of problem:
qemu 3.0 got a neu Display device: bochs-Display.
libvirt should support it.
It has no legacy vga support.
Can be placed in PCI Express slots.
OVMF and linux kernel have support for it.
RISC-V will probably use it as default display device.

more background Information:
https://www.kraxel.org/blog/2018/10/qemu-vga-emulation-and-bochs-display/

Comment 3 Jiri Denemark 2019-07-16 11:22:01 UTC

Implemented upstream by

commit e579f5300b9cd32282e50f3d0b30dd989b3238c8
Refs: v5.5.0-153-ge579f5300b
Author:     Jonathon Jongsma <jjongsma>
AuthorDate: Fri Jul 12 15:12:16 2019 -0500
Commit:     Ján Tomko <jtomko>
CommitDate: Mon Jul 15 10:21:21 2019 +0200

    qemu: add 'bochs' video display type

    Update schema and configuration to allow specifying new video type of
    'bochs'. Add implementation and tests for qemu.

    Signed-off-by: Jonathon Jongsma <jjongsma>
    Reviewed-by: Ján Tomko <jtomko>
    Signed-off-by: Ján Tomko <jtomko>

Comment 5 yafu 2019-09-03 07:16:48 UTC

Verified with libvirt-5.6.0-3.x86_64.

Test steps:
1.Start a guest with bochs type video:
#virsh dumpxml vm2
...
  <video>
      <model type='bochs' vram='16384' heads='1' primary='yes'>
        <acceleration accel3d='no'/>
      </model>
      <alias name='ua-04c2decd-4e33-4023-84de-12205c777af6'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </video>
...

2.Connect the guest with virt-viewer and can show the display correctly:
#virt-viewer vm2

3.Do migration with bochs video device:
#virsh migrate vm2 qemu+ssh://10.66.5.225/system --live --verbose
Migration: [100 %]

4.Do cross migration and target host not support bochs video device:
# virsh migrate iommu2 qemu+ssh://10.66.5.225/system --live --verbose 
error: unsupported configuration: unknown video model 'bochs

5.Edit guest xml with bochs as non-primary video and save:
#virsh edit vm2
...
<video>
      <model type='virtio' vram='16384' heads='1' primary='yes'>
        <acceleration accel3d='no'/>
      </model>
      <alias name='ua-04c2decd-4e33-4023-84de-12205c777af6'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </video>
    <video>
      <model type='bochs' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
    </video>
...
error: unsupported configuration: video type 'bochs' is only valid as primary video device
Failed. Try again? [y,n,i,f,?]:

Comment 7 errata-xmlrpc 2019-11-06 07:12:03 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, 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/RHBA-2019:3723