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 ...

You've used all your votes and won't be able to post a new idea, but you can still search and comment on existing ideas.

There are two ways to get more votes:

  • When an admin closes an idea you've voted on, you'll get your votes back from that idea.
  • You can remove your votes from an open idea you support.
  • To see ideas you have already voted on, select the "My feedback" filter and select "My open ideas".
(thinking…)

Enter your idea and we'll search to see if someone has already suggested it.

If a similar idea already exists, you can support and comment on it.

If it doesn't exist, you can post your idea so others can support it.

Enter your idea and we'll search to see if someone has already suggested it.

  1. Support for pNFS

    With NFSv4 support common these days, the next logical improvement step would be to support parallel NFS (pNFS) to provide even greater throughput and flexibility.

    5 votes
    Vote
    Sign in
    Check!
    (thinking…)
    Reset
    or sign in with
    • facebook
    • google
      Password icon
      I agree to the terms of service
      Signed in as (Sign out)
      You have left! (?) (thinking…)
    • Build a NEW HOW-TO describing how to create a Xen 4.5.1 AMD64 environment. This should include sub-HOWTOs for networking and DomU creation.

      All the examples for installing and using Xen are currently antiquated.
      Can someone just record how they set up a new system using Ubuntu 14/15, Xen 4.5.1, and XAPI/xl? Sections on setting up networking, passthru, BIOS bugs and *NIX/Win/OSX would be exactly what is needed.

      1 vote
      Vote
      Sign in
      Check!
      (thinking…)
      Reset
      or sign in with
      • facebook
      • google
        Password icon
        I agree to the terms of service
        Signed in as (Sign out)
        You have left! (?) (thinking…)
      • Implement support for USB-based Local Storage Repositories

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

        11 votes
        Vote
        Sign in
        Check!
        (thinking…)
        Reset
        or sign in with
        • facebook
        • google
          Password icon
          I agree to the terms of service
          Signed in as (Sign out)
          You have left! (?) (thinking…)
          under review  ·  1 comment  ·  Admin →
        • EHCI / XHCI Emulation in HVM Guest

          Hi,

          I have been using xen 4.4 to emulate EHCI/XHCI in Ubuntu HVM Guest. I have specified usbviersion 2 for EHCI in HVM config file.
          However, I am unable to see UHCI / EHCI emulated controller in HVM Guest. If I do not specify usbversion in HVM then I can see UHCI emulated controller present in HVM Guest.

          Is this a limitation of Xen 4.4? Xen 4.5 will come up with complete Emulation of EHCI / XHCI? If yes, then May I know tentative date of Xen 4.5 Release?

          As I have to run multiple HVM Guest OSs with EHCI…

          4 votes
          Vote
          Sign in
          Check!
          (thinking…)
          Reset
          or sign in with
          • facebook
          • google
            Password icon
            I agree to the terms of service
            Signed in as (Sign out)
            You have left! (?) (thinking…)
          • 51 votes
            Vote
            Sign in
            Check!
            (thinking…)
            Reset
            or sign in with
            • facebook
            • google
              Password icon
              I agree to the terms of service
              Signed in as (Sign out)
              You have left! (?) (thinking…)
            • 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.

              32 votes
              Vote
              Sign in
              Check!
              (thinking…)
              Reset
              or sign in with
              • facebook
              • google
                Password icon
                I agree to the terms of service
                Signed in as (Sign out)
                You have left! (?) (thinking…)
              • 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
                Vote
                Sign in
                Check!
                (thinking…)
                Reset
                or sign in with
                • facebook
                • google
                  Password icon
                  I agree to the terms of service
                  Signed in as (Sign out)
                  You have left! (?) (thinking…)
                • 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.

                  13 votes
                  Vote
                  Sign in
                  Check!
                  (thinking…)
                  Reset
                  or sign in with
                  • facebook
                  • google
                    Password icon
                    I agree to the terms of service
                    Signed in as (Sign out)
                    You have left! (?) (thinking…)
                  • 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).

                    24 votes
                    Vote
                    Sign in
                    Check!
                    (thinking…)
                    Reset
                    or sign in with
                    • facebook
                    • google
                      Password icon
                      I agree to the terms of service
                      Signed in as (Sign out)
                      You have left! (?) (thinking…)
                    • Implement Xen hypervisor dmesg log entry timestamps

                      Implement timestamps in the Xen hypervisor dmesg log entries, like Linux does. Timestamps make troubleshooting easier, allowing you to actually know when certain events/errors happened.

                      Like this in Linux dmesg:

                      [ 0.000000] tsc: Fast TSC calibration using PIT
                      [ 0.001000] tsc: Detected 2893.294 MHz processor
                      [ 0.000002] Calibrating delay loop (skipped), value calculated using timer fr
                      equency.. 5786.58 BogoMIPS (lpj=2893294)
                      [ 0.000004] pid_max: default: 32768 minimum: 301
                      [ 0.000037] Security Framework initialized
                      [ 0.000042] SELinux: Initializing.
                      [ 0.000049] SELinux: Starting in permissive mode
                      ..

                      12 votes
                      Vote
                      Sign in
                      Check!
                      (thinking…)
                      Reset
                      or sign in with
                      • facebook
                      • google
                        Password icon
                        I agree to the terms of service
                        Signed in as (Sign out)
                        You have left! (?) (thinking…)
                        1 comment  ·  Admin →
                      • 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.

                        9 votes
                        Vote
                        Sign in
                        Check!
                        (thinking…)
                        Reset
                        or sign in with
                        • facebook
                        • google
                          Password icon
                          I agree to the terms of service
                          Signed in as (Sign out)
                          You have left! (?) (thinking…)
                          under review  ·  1 comment  ·  Admin →
                        • 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.

                          12 votes
                          Vote
                          Sign in
                          Check!
                          (thinking…)
                          Reset
                          or sign in with
                          • facebook
                          • google
                            Password icon
                            I agree to the terms of service
                            Signed in as (Sign out)
                            You have left! (?) (thinking…)
                          • Ability to prevent passed through devices from being ejected in Windows guests

                            When you pass through a GPU to a Windows guest, Windows recognises the device as one that can be ejected from the safely remove hardware feature. It'd be great to allow this to be overriden for some devices.

                            1 vote
                            Vote
                            Sign in
                            Check!
                            (thinking…)
                            Reset
                            or sign in with
                            • facebook
                            • google
                              Password icon
                              I agree to the terms of service
                              Signed in as (Sign out)
                              You have left! (?) (thinking…)
                            • 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.

                              16 votes
                              Vote
                              Sign in
                              Check!
                              (thinking…)
                              Reset
                              or sign in with
                              • facebook
                              • google
                                Password icon
                                I agree to the terms of service
                                Signed in as (Sign out)
                                You have left! (?) (thinking…)
                                under review  ·  1 comment  ·  Admin →
                              • 25 votes
                                Vote
                                Sign in
                                Check!
                                (thinking…)
                                Reset
                                or sign in with
                                • facebook
                                • google
                                  Password icon
                                  I agree to the terms of service
                                  Signed in as (Sign out)
                                  You have left! (?) (thinking…)
                                • HPC cluster feature, like Grid Computing or High Performance Computing.

                                  In the current architecture, the computing capacity is confined to the single node of the pool servers.
                                  Hasn't been evaluated to introduce a solution for distributed computing?
                                  like Grid Computing or High Performance Computing (HPC)?

                                  1 vote
                                  Vote
                                  Sign in
                                  Check!
                                  (thinking…)
                                  Reset
                                  or sign in with
                                  • facebook
                                  • google
                                    Password icon
                                    I agree to the terms of service
                                    Signed in as (Sign out)
                                    You have left! (?) (thinking…)
                                    under review  ·  1 comment  ·  Admin →
                                  • 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".

                                    13 votes
                                    Vote
                                    Sign in
                                    Check!
                                    (thinking…)
                                    Reset
                                    or sign in with
                                    • facebook
                                    • google
                                      Password icon
                                      I agree to the terms of service
                                      Signed in as (Sign out)
                                      You have left! (?) (thinking…)
                                      under review  ·  1 comment  ·  Admin →
                                    • Live VM cloning

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

                                      43 votes
                                      Vote
                                      Sign in
                                      Check!
                                      (thinking…)
                                      Reset
                                      or sign in with
                                      • facebook
                                      • google
                                        Password icon
                                        I agree to the terms of service
                                        Signed in as (Sign out)
                                        You have left! (?) (thinking…)
                                      • 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…

                                        19 votes
                                        Vote
                                        Sign in
                                        Check!
                                        (thinking…)
                                        Reset
                                        or sign in with
                                        • facebook
                                        • google
                                          Password icon
                                          I agree to the terms of service
                                          Signed in as (Sign out)
                                          You have left! (?) (thinking…)
                                        • 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.

                                          145 votes
                                          Vote
                                          Sign in
                                          Check!
                                          (thinking…)
                                          Reset
                                          or sign in with
                                          • facebook
                                          • google
                                            Password icon
                                            I agree to the terms of service
                                            Signed in as (Sign out)
                                            You have left! (?) (thinking…)
                                          ← Previous 1
                                          • Don't see your idea?

                                          Xen Development

                                          Feedback and Knowledge Base