Re: [Xen-devel] Problems with xen 4.2

[Fantu <fantonifabio@xxxxxxxxxx>]

Fantu wrote
> 
> 
> Fantu wrote
>> 
>> For many years we used virtualization systems based on xen.
>> Up to now we did quite well despite same issue we are trying to solve
>> with the new version.
>> The main issue that we found are about Windows domU performance and the
>> thin client interface with rdp is sometimes problematic.
>> We think a possible solution to solve current shortcomings could be qemu
>> upstream with spice, qxl and USB redirection.
>> We have started preparing a new test system based on Wheezy, the upstream
>> kernel and xen 4.2.
>> The current test system is:
>> Wheezy 64 bit with kernel from package linux-image-3.2.0-2-amd64 version
>> 3.2.12-1, package blktap-dkms and all dependency packages for xen spice
>> and usb redirection.
>> -------------------------
>> /etc/modules
>> ------------
>> loop max_loop=64
>> xenfs
>> xen-evtchn
>> blktap
>> -------------------------
>> hg clone http://xenbits.xen.org/xen-unstable.hg (last build changeset
>> 25070)
>> vi Makefile # removed dist-kernel to not compile kernel
>> -------------------------
>> vi Config.mk # qemu upstream unstable and seabios unstable
>> ------------
>> QEMU_UPSTREAM_URL ?= git://git.qemu.org/qemu.git
>> SEABIOS_UPSTREAM_URL ?= git://git.seabios.org/seabios.git
>> SEABIOS_UPSTREAM_TAG ?= master
>> QEMU_TAG ?= master
>> -------------------------
>> Added some patches:
>> - autoconf: add variable for pass arbitrary options to qemu upstream - my
>> patch to build spice and usbredirection on qemu upstream
>> - QEMU upstream need to kown the amount of RAM given to a guest. This
>> patch give
>> the correct value. - Anthony PERARD patch for try to solve ram/videoram
>> issue
>> - tools: specify datadir for qemu-xen build to fix firmware loading -
>> Olaf Hering patch for try to solve qxl issue
>> -------------------------
>> ./configure QEMUU_ADD_PAR="--enable-spice --enable-usb-redir"
>> -------------------------
>> vi config/Tools.mk # workaround for libxl compilation problem
>> BISON               := bison
>> FLEX                := flex
>> -------------------------
>> make dist
>> ./install.sh
>> insserv xencommons &&
>> insserv xendomains
>> 
>> 
>> Result:
>> Full PV domU work, just minimal tests done.
>> HVM domU with qemu traditional works but with qemu upstream some problem
>> encountered.
>> For now I didn't find a way to make Windows run on qemu upstream and
>> nothing on logs.
>> About Linux domU HVM I tried with Precise (Ubuntu 12.04 LTS).
>> Spice and usbrediction seem to be working in basic test done now, qxl
>> not.
>> 
>> About qxl vga with qemu from xen repository (1.0.1) qemu hangs on start,
>> with qemu unstable it starts but with an allocation problem, on xorg log:
>> Out of video memory: Could not allocate 4198400 bytes
>> I tried to update also seabios to unstable but same problem.
>> Is the patch incomplete or is there videoram fixed limit to 4 MB? 
>> 
>> Current xl domU configuration file:
>> -----------------------------------
>> name='PRECISEHVM'
>> builder="hvm"
>> memory=1024
>> #maxmem=1536
>> vcpus=2
>> #hap=1
>> #pae=1
>> #acpi=1
>> #apic=1
>> #nx=1
>> vif=['bridge=xenbr0']
>> #vfb=['vnc=1,vncunused=1,vnclisten="0.0.0.0",keymap="it"']
>> #disk=['/mnt/vm/disks/PRECISEHVM.disk1.xm,raw,hda,rw',
>> '/dev/sr0,raw,hdb,ro,cdrom']
>> disk=['/mnt/vm/disks/PRECISEHVM.disk1.xm,raw,hda,rw']
>> boot='c'
>> xen_platform_pci=1
>> device_model_version='qemu-xen'
>> vnc=0
>> #vncunused=1
>> #vnclisten="0.0.0.0"
>> #keymap="it"
>> #stdvga=1
>> #sdl=0
>> spice=1
>> spicehost='0.0.0.0'
>> spiceport=6000
>> spicedisable_ticketing=1
>> #spicepasswd='test'
>> device_model_override="/usr/lib/xen/bin/qemu-debug.sh"
>> #device_model_args=["-vga qxl -global qxl-vga.vram_size=33554432"]
>> device_model_args=["-vga qxl"]
>> #device_model_args=["-usb -device usb-ehci"]
>> #on_crash='preserve'
>> videoram=128
>> #bios="ovmf"
>> #device_model_args=["-readconfig /etc/xen/ich9-ehci-uhci.cfg",
>>         "-chardev spicevmc,name=usbredir,id=usbredirchardev1 -device
>> usb-redir,chardev=usbredirchardev1,id=usbredirdev1,bus=ehci.0,debug=3",
>>         "-chardev spicevmc,name=usbredir,id=usbredirchardev2 -device
>> usb-redir,chardev=usbredirchardev2,id=usbredirdev2,bus=ehci.0,debug=3",
>>         "-chardev spicevmc,name=usbredir,id=usbredirchardev3 -device
>> usb-redir,chardev=usbredirchardev3,id=usbredirdev3,bus=ehci.0,debug=3"]
>> -----------------------------------
>> 
>> Can someone help to solve these issues?
>> Thanks for any reply.
>> 
> Today I have done other tests: windows xp sp3 installs and runs
> successfully on qemu upstream unstable.
> Vnc working but too slow, with stdvga improved but not optimal.
> Spice with qxl is working but with slow graphic performance. It seems to
> have only 4 mb videoram usable (seem to be same with Precise, see quote).
> 
> This is the current xl configuration:
> -------------------------------------
> name='XP'
> builder="hvm"
> memory=1024
> vcpus=2
> hap=1
> pae=1
> acpi=1
> apic=1
> nx=1
> vif=['bridge=xenbr0']
> #vfb=['vnc=1,vncunused=1,vnclisten=0.0.0.0,keymap=it']
> disk=['/mnt/vm/disks/XP.disk1.xm,raw,hda,rw']
> boot='d'
> xen_platform_pci=1
> viridian=1
> device_model_version="qemu-xen"
> device_model_override="/usr/lib/xen/bin/qemu-debug.sh"
> vnc=0
> #vncunused=1
> #vnclisten="0.0.0.0"
> #keymap="it"
> spice=1
> spicehost="0.0.0.0"
> spiceport=6000
> spicedisable_ticketing=1
> on_poweroff="destroy"
> on_reboot="restart"
> on_crash="destroy"
> stdvga=0
> device_model_args=["-vga qxl"]
> videoram=128
> -------------------------------------
> 
Also Windows 7 is working with qemu upstream, with patches and workaround
applied probably, for details see the first post.

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