Red Hat Bugzilla – Bug 1368406
Virtual display of virtio-gpu should behave like qxl device when using rhel7.3 guest
Last modified: 2017-08-01 23:29:59 EDT
Description of problem: Virtual display of virtio-gpu should behave like qxl device when using rhel7.3 guest Version-Release number of selected component (if applicable): qemu-kvm-rhev package:qemu-kvm-rhev-2.6.0-21.el7.x86_64 host & guest kernel: 3.10.0-489.el7.x86_64 virt-viewer: virt-viewer-2.0-11.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.Boot rhel7.3 guest use qemu cli: /usr/libexec/qemu-kvm -name rhel7.3 -m 2048 \ -cpu Haswell-noTSX \ -smp 6,threads=2,cores=1,sockets=3,maxcpus=6 \ -device virtio-vga\ -device virtio-gpu\ -spice port=5901,disable-ticketing \ -device virtio-serial -chardev spicevmc,id=vdagent,debug=0,name=vdagent \ -serial unix:/tmp/m,server,nowait \ -device virtserialport,chardev=vdagent,name=com.redhat.spice.0 \ -drive file=rhel73.qcow2,if=none,id=drive-scsi-disk0,format=qcow2,cache=none,werror=stop,rerror=stop -device virtio-scsi-pci,id=scsi0,disable-modern=off,disable-legacy=off -device scsi-hd,drive=drive-scsi-disk0,bus=scsi0.0,scsi-id=0,lun=0,id=scsi-disk0,bootindex=1 \ -monitor stdio \ -usb -device usb-kbd,id=input0 \ -netdev tap,id=idinWyYp -device virtio-net-pci,mac=42:ce:a9:d2:4d:d7,id=idlbq7eA,netdev=idinWyYp \ -qmp tcp:localhost:4444,server,nowait \ -device ich9-intel-hda -device hda-duplex \ 2.remote-viewer spice://127.0.0.1:5901 3. Actual results: Guest have two displays after remote-viewer connected and guest cannot use virtio-gpu display to display desktop Expected results: Guest have one display after remote-viewer connected Additional info: Test aginst qxl-vga with multiple qxl devices, only one display present. Attach screenshot to show phenomenon of virtio-vga with virtio-gpu device.
multihead + multiseat is beyond the scope for 7.3, moving to 7.4.
(In reply to Gerd Hoffmann from comment #2) > multihead + multiseat is beyond the scope for 7.3, moving to 7.4. host side: qemu 2.8 needed. guest side: kernel with drm driver rebase needed (will probably happen late in the devel cycle). With those multihead should work fine.
(In reply to Gerd Hoffmann from comment #3) > (In reply to Gerd Hoffmann from comment #2) > > multihead + multiseat is beyond the scope for 7.3, moving to 7.4. > > host side: qemu 2.8 needed. > guest side: kernel with drm driver rebase needed (will probably happen late > in the devel cycle). > > With those multihead should work fine. Please retest with qemu-2.9 and a fresh up to date RHEL-7.4 kernel.
For virtio-vga multiheads support, it has been verified in 1368406 Virtual display of virtio-gpu should behave like qxl device when using rhel7.3 guest. For this bug, if use default options of virtio-gpu, the behavior is same as original report. But landing to qemu-kvm-rhev 2.9，I can override the default options of virtio-gpu to make virtio-gpu behave like qxl: -device virtio-gpu,max_outputs=0 The default max_outputs of qxl is 0: dev: qxl, id "" ram_size = 67108864 (0x4000000) vram_size = 67108864 (0x4000000) revision = 4 (0x4) debug = 0 (0x0) guestdebug = 0 (0x0) cmdlog = 0 (0x0) ram_size_mb = 4294967295 (0xffffffff) vram_size_mb = 4294967295 (0xffffffff) vram64_size_mb = 4294967295 (0xffffffff) vgamem_mb = 16 (0x10) surfaces = 1024 (0x400) max_outputs = 0 (0x0) addr = 03.0 romfile = "" rombar = 1 (0x1) multifunction = false command_serr_enable = true x-pcie-lnksta-dllla = true x-pcie-extcap-init = true class Display controller, addr 00:03.0, pci id 1b36:0100 (sub 1af4:1100) bar 0: mem at 0xffffffffffffffff [0x3fffffe] bar 1: mem at 0xffffffffffffffff [0x3fffffe] bar 2: mem at 0xffffffffffffffff [0x1ffe] bar 3: i/o at 0xffffffffffffffff [0x1e] The default max_outputs of virtio-gpu is 1 but can be overrided to 0: dev: virtio-gpu-pci, id "" ioeventfd = false vectors = 3 (0x3) virtio-pci-bus-master-bug-migration = false disable-legacy = "on" disable-modern = false migrate-extra = true modern-pio-notify = false x-disable-pcie = false page-per-vq = false x-ignore-backend-features = false ats = false x-pcie-deverr-init = true x-pcie-lnkctl-init = true x-pcie-pm-init = true addr = 03.0 romfile = "" rombar = 1 (0x1) multifunction = false command_serr_enable = true x-pcie-lnksta-dllla = true x-pcie-extcap-init = true class Display controller, addr 00:03.0, pci id 1af4:1050 (sub 1af4:1100) bar 1: mem at 0xffffffffffffffff [0xffe] bar 4: mem at 0xffffffffffffffff [0x3ffe] bus: virtio-bus type virtio-pci-bus dev: virtio-gpu-device, id "" max_outputs = 1 (0x1) max_hostmem = 268435456 (256 MiB) indirect_desc = true event_idx = true notify_on_empty = true any_layout = true iommu_platform = false __com.redhat_rhel6_ctrl_guest_workaround = false So the bug is verified now
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/RHSA-2017:2392