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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I suggest you ...

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  1. 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 →
    • 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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      • 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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        • 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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          • 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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