Xen Development

Help us focus our efforts on Xen development! Please suggest things you think would make the Xen project more useful. More importantly, rate the improvements you think are the most important.

Please note that this forum is NOT for requests related to either XCP or XenServer. Requests or comments related to those projects will be deleted.

Suggestions can involve the core Xen tree, or in Linux or qemu.

Be sure to describe primarily what problem you’re trying to solve. That will help us determine what the best technical solution is. It may even be that there already is a solution we can suggest you use.

Responses mean:

  • Under review: It’s on our radar, but no one has said they are working on it for a specific release
  • Planned: Someone has said they are working on it for a particular release
  • Started: Someone has started the code
  • Completed: The code is done, and should be available in the next release (if it’s not available already)

I suggest you ...

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  1. VGA/GPU passthru support for AMD/NVIDIA GPUs

    Review, cleanup and merge AMD/ATI and NVIDIA GPU passthru patches from xen-devel archives. These patches deal with GPU vendor specific tweaks required to properly fetch and passthru the VBIOS, and also deal with the various legacy VGA ioports, memory ranges, mmios, etc.

    These patches are required to make the passthru GPU be the "primary" gfx card in the VM, and some GPUs won't work at all without these patches.

    155 votes
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    • 88 votes
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      • Add Remote Replication

        Add a mechanism to remotely replicate the vm's without the use of external storage. This is a major need for smaller deployments.

        54 votes
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        • Implement vGPU support for AMD/NVIDIA GPUs

          True GPU virtualization is becoming more mainstream. Passthrough is only useful in certain applications and vGPU support would greatly expand the possibilities and reach of Xen.

          52 votes
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          • Live VM cloning

            Allow running VMs to be cloned, rather than having to clone them by pausing.

            51 votes
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            • 42 votes
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              • Dom0 keyboard/mouse sharing/passthru to HVM guest

                This feature is mostly needed by VGA/GPU passthru users, so they can share the dom0 keyboard/mouse to the HVM guest where they use the GPU.

                Some initial implementations have been done earlier and discussed on xen-devel, but nothing has been merged to upstream Xen.

                Earlier discussion and patches:
                http://old-list-archives.xen.org/archives/html/xen-devel/2010-03/msg00979.html
                and
                http://lists.xen.org/archives/html/xen-devel/2012-01/msg00585.html

                XenClient also has some implementation of keyboard/mouse sharing.

                39 votes
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                  under review  ·  1 comment  ·  Admin →
                • Spice support for PV domains

                  I'm using Spice on my xen test system since end of 2011.
                  Spice is better than vnc for use on maintenance tasks and better than
                  nx/x2go/rdp installed on domU (even better when used with vdagent and usb
                  redirection).

                  32 votes
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                  • CUDA Support

                    step 1) Only passthu NVIDIA CUDA (parallel computing) functions.
                    stap 2) Using CUDA on host-GPU for guest-CPU virtualization on appropriate operations.

                    25 votes
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                      under review  ·  1 comment  ·  Admin →
                    • let domUs automatically switch to PV after install

                      Bascially, we love 3 things:
                      1. Easy install, looking just like a native one (PXE without fuss) using an ISO. Thats something HVM knows how to do. Ideally autodetect nic typ so you don't end up stuck on emulated drivers.

                      2. The High Performance from running a 100% PV domU. Nothing beats that. No matter if you need to run dozens or hundreds of domUs on a host, or if you want to enjoy battery-conserving zero-idle-overhead virtualization on a laptop.

                      3. The great feeling if you converted a HV domU after install and see it fly.

                      Now, question:
                      Can't we…

                      21 votes
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                      • xl support for PVSCSI

                        xm/xend supports PVSCSI, so xl should support it aswell.
                        PVSCSI is useful for passing thru SCSI/FC/SAS tape drives, autoloaders, tape robots, backplane/chassis management devices, disk LUNs, or any other SCSI device to a Xen VM. In addition to passing thru single devices/LUNs PVSCSI can also passthru all devices/LUNs on a SCSI/FC/SAS host controller. PVSCSI can also be used for NPIV.

                        More information about PVSCSI:
                        http://wiki.xen.org/wiki/Paravirtualized_SCSI

                        PVSCSI requires backend driver in dom0 kernel, and frontend driver in guest kernel. Suse's xenlinux forward-ported patches contain PVSCSI drivers, also for HVM guests (unmodied_drivers). Konrad's git tree has initial port of PVSCSI to pvops.…

                        20 votes
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                        • Provide newer signed GPLPV drivers for download

                          I know univention provide an older version of signed GPLPV drivers for Windows guests, but it would be good if there were newer ones available officially off the xen site that were kept more up to date.

                          19 votes
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                          • Automatic NUMA optimization

                            NUMA systems are becoming more common; configuring such a system optimally and keeping it optimal is difficult. It would be nice if Xen could automatically place and move VMs according to current conditions to optimize performance.

                            19 votes
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                            • dom0 has the ability to balloon up automatically, when memory is available again

                              Presently dom0 can balloon down, but does not balloon up if memory becomes available again! dom0 could try to keep the memory at a recommended level by itself.

                              18 votes
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                              • Allow a VM with a locally-attached disk to live-migrate both VM and disk to another host

                                Note that this feature is already available in XCP 1.6: the request here is to implement this functionality in xl.

                                18 votes
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                                  under review  ·  1 comment  ·  Admin →
                                • Implement support for USB-based Local Storage Repositories

                                  This is useful for backup devices, transferring data between VMs, etc.

                                  18 votes
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                                    under review  ·  1 comment  ·  Admin →
                                  • SR-IOV VM live migration

                                    Support for VM live migration even if some SR-IOV VF virtual devices are attached to VM. such has http://www.youtube.com/watch?v=17so6019Dow

                                    16 votes
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                                    • HVM guest direct kernel/initrd boot support

                                      Support being able to specify a kernel and initrd/initramfs for an HVM guest, like you can for PV domUs, and being able to directly boot them without going for the legacy BIOS boot sequence.

                                      KVM support this.

                                      14 votes
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                                      • support for shared folders like in virtualbox

                                        It would be nice if we can mount a shared folder, viewed like a device, like in VirtualBox.

                                        For example, to share a folder called "myshare", we run "modprobe vboxsf", then we can mount like "mount -t vboxsf /dev/myshare /mnt".

                                        14 votes
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                                          under review  ·  1 comment  ·  Admin →
                                        • Use a more OSS-friendly video format for the XenProject website (instead of Shockwave Flash)

                                          Make your videos Linux friendly, It's sad I have to even post this... ADOBE, shockwave flash... for real... whatever...

                                          7 votes
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