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.

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

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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.

    152 votes
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    • Support for GlusterFS

      It would be wonderful if GlusterFS was properly supported, even if only with native CLI tools, which are plenty good for most things. Being able to share local storage between machines as a glusterfs volume or volumes is interesting as a means of building highly-available VMs.

      93 votes
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        1 comment  ·  Admin →
      • 82 votes
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        • xl support for PVUSB for both PV and HVM guests

          xm/xend supports PVUSB for both PV and HVM guests, so xl should support it aswell. Some information about PVUSB available from: http://wiki.xen.org/wiki/Xen_USB_Passthrough.

          PVUSB requires backend driver in dom0 kernel, and frontend driver in the guest kernel. Driver status:
          Suse's xenlinux forward-ported patches contain PVUSB drivers for both PV and HVM guests (so also in unmodified_drivers). Konrad's git tree has initial port of PVUSB drivers to pvops, but those should be reviewed, cleanup up and upstreamed. Also James Harper's Windows GPLPV drivers contain early version of PVUSB frontend driver.

          59 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.

            51 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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              • 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.

                40 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 →
                  • 38 votes
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                    • libgfapi support for GlusterFS

                      Have native support for libgfapi. So the access to GlusterFS API is supported for HS/Shared Storage

                      34 votes
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                      • 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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                        • xl support for USB device passthru to HVM guest Qemu emulated USB

                          xm/xend currently supports USB device passthru from dom0 to HVM guest, using qemu-dm-traditional. USB device will show up in the emulated USB controller in the HVM guest, so no extra drivers are needed in the guest kernel. Currently Xen qemu-dm only emulates USB 1.1, so the performance is quite poor, but with upstream Qemu USB 2.0 / 3.0 should be possible.

                          xl should support USB device passthru to HVM guest Qemu emulated USB controller with both qemu-traditional and also with qemu-upstream.

                          Some more information here:
                          http://wiki.xen.org/wiki/Xen_USB_Passthrough

                          32 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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                            • 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
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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.

                                19 votes
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                                  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.

                                  18 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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                                    • 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.

                                      16 votes
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                                      • 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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                                        • 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
                                          ..

                                          15 votes
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                                            1 comment  ·  Admin →
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