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Guest bug, looks like Xorg has trouble with the 24bpp framebuffer provided by the cirrus kms driver. Assigning to modesetting driver for investigation.
this is actually a bug in the upper layers somewhere, 24bpp in gnome/mutter or mesa sucks,
I think we can just workaround it in -modesetting for now
so ack.
This request was resolved in Red Hat Enterprise Linux 7.0.
Contact your manager or support representative in case you have further questions about the request.
Created attachment 835695 [details] guest screen snapshot Description of problem: rhel7-64 guest display abnormal with cirrus vga Version-Release number of selected component (if applicable): Host: qemu-kvm-rhev-1.5.3-21.el7.x86_64 kernel-3.10.0-57.el7.x86_64 Gust: rhel7-64 How reproducible: always Steps to Reproduce: 1.Start qemu-kvm with following cli: /usr/libexec/qemu-kvm \ -M pc \ -cpu SandyBridge \ -m 2G \ -smp 4,sockets=2,cores=2,threads=1,maxcpus=16 \ -enable-kvm \ -name win8-32 \ -uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \ -smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \ -k en-us \ -rtc base=localtime,clock=host,driftfix=slew \ -nodefaults \ -monitor stdio \ -qmp tcp:0:6666,server,nowait \ -boot menu=on \ -bios /usr/share/seabios/bios.bin \ -drive file=/home/rhel7-64.qcow2,if=none,id=drive-data-disk,format=qcow2,cache=none,aio=native,werror=stop,rerror=stop \ -device virtio-blk-pci,bus=pci.0,addr=0x7,scsi=off,drive=drive-data-disk,id=data-disk \ -vga cirrus \ -vnc :0 \ -device virtio-balloon-pci,bus=pci.0,id=balloon0 \ -netdev tap,id=hostnet0,script=/etc/ovs-ifup,downscript=/etc/ovs-ifdown \ -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:01:01:ef \ 2. 3. Actual results: Guest display abnormal(screen snapshot attached), remote-viewer will disconnected when login guest. Expected results: Display normal, remote-viewer connection stable. Additional info: With "-vga std" not hit this problem.