virt-v2v-release-notes-2.10(1)

NAME
virt-v2v-release-notes - virt-v2v release notes for 2.10

DESCRIPTION
These are the release notes for virt-v2v 2.10. This describes the major changes since 2.8.

Virt-v2v 2.10.0 was released on 6th January 2026.

  New features
In -o kubevirt output mode, new -oo disk and -oo create options let you respectively override the output disk names, and avoid disk creation, letting you pre-create disks before running virt-v2v.

For VDDK sources:

•   A new -io vddk-compression option lets you enable compression for data read over the network.

•   -io vddk-thumbprint is now optional. If omitted, virt-v2v will automatically work it out from the VMware server.

New --memsize and --smp options which let you override the default amount of memory and number of vCPUs assigned to the appliance. For certain complex guests it is occasionally necessary to adjust these, although usually virt-v2v should do the right thing automatically.

virt-v2v-inspector(1) now detects Windows Antivirus and Group policy, and if found adds "<windows_antivirus/>" and "<windows_group_policy/>" elements respectively.

  Features removed
The following virt-v2v options have been removed:

-io vddk-noextents
    This was an undocumented troubleshooting option. Any uses of it can simply be removed.

--sm* options
    The Red Hat Subscription Manager customization options did not work and have been removed (Cole Robinson).

  Other fixes
When checking ext4 filesystems before conversion, replay the dirty log to avoid e2fsck failing (thanks Ming Xie).

When checking XFS filesystems before and after conversion, cap the amount of memory used by the xfs_repair(8) utility (thanks Ming Xie, Eric Sandeen).

For output modes that write to local disk, in debugging output we now report the amount of space on the local (host) disk, in order to make it easier to debug certain out of space problems (thanks Martin Necas, Alex Kalenyuk).

Use nbdkit-count-filter(1) (if installed). In debugging mode this will print a summary of the number of bytes read, written, trimmed and zeroed when copying the guest, which can be useful when you want to know how much data was sent over the wire by virt-v2v.

For Windows virtio driver installation:

•   Fix this when there is a pending Windows Update (Vadim Rozenfeld).

•   Fix this when Windows changes the timezone during firstboot (Vadim Rozenfeld).

•   Skip driver installation when a newer/better virtio driver is already installed (Vadim Rozenfeld).

•   Slightly modify how we patch the regsitry so that we don't break both Windows Update and "pnputil /e" driver enumeration.

Display the versions of libnbd and nbdcopy in debugging output.

Fix SELinux relabelling for guests which use a separate /usr partition (thanks Germano Veit Michel, Ming Xie).

We now attempt to generate correct boot order for Linux BIOS guests. This is necessary with current SeaBIOS so that it initializes the correct boot disk, allowing the guest to boot if the bootloader is not on the first disk.

Name nbdkit subprocesses using the new --name option in nbdkit ≥ 1.46. This allows debugging and error messages from different nbdkit instances to be distinguished in log files.

A virtual floppy disk is no longer added to the output guest if qemu does not support it, even if the input guest has a floppy disk (Cole Robinson).

During conversion of Windows guests, if we have to create C:\Program Files\Guestfs, it is now created read-only for non-Administrator accounts (Cole Robinson).

For RHEL 7.2 conversions, ignore archived LVM VG configuration files, which previously caused a crash in Augeas during conversion (thanks Sean Haselden, Alasdair Kergon).

Handle .vmdk files in subdirectories on the ESXi server (thanks Ming Xie).

Fix UEFI conversions of Windows guests if C:\Windows\Temp exists but has a different upper/lowercase from the directory that Windows normally creates.

  Documentation
Refactored and improved documentation (thanks Ming Xie).

Link from virt-v2v(1) directly to official VMware documentation for removing VMware Tools.

  Build changes
libguestfs ≥ 1.58 is required.

nbdkit ≥ 1.46 is required.

Update "make check-slow" ("slow tests") so we test more recent guest types.

We now test Windows UEFI conversions in the test suite.

"./configure" output has been colourized.

New configure --disable-block-driver, --disable-glance, --disable-ovirt and --disable-xen options allowing you to disable those features at compile time.

Basic github CI has been implemented. Pull requests now do the equivalent of "./configure --enable-werror && make && make check" on a few common platforms.

  Internals
The internal podwrapper tool used to process the documentation now has a new --pp to allow a preprocessor to be used. In particular we now use m4(1) to preprocess some documentation.

In Makefile.am, "$(NULL)" can be used as a list terminator. This improves patch application.

  Bugs fixed

https://issues.redhat.com/browse/RHEL-100682
    Installing drivers on firstboot sometimes fail with PnP service not available [rhel-9.7]

https://issues.redhat.com/browse/RHEL-101599
    RFE: Allow -o kubevirt disks to be specified

https://issues.redhat.com/browse/RHEL-102734
    virt-v2v can't convert guest with multiple disks from VMware since nbdkit-1.44.0-1

https://issues.redhat.com/browse/RHEL-104352
    Change permission of guestfs folder created

https://issues.redhat.com/browse/RHEL-108174
    selinux-relabel doesn't work across filesystem boundaries (because setfiles doesn't) [rhel-9.7]

https://issues.redhat.com/browse/RHEL-108991
    RFE: Set boot order for Linux BIOS guests based on grub location [rhel-10.1]

https://issues.redhat.com/browse/RHEL-110742
    RFE: Set boot order for guests in -o kubevirt output mode [rhel-10.1]

https://issues.redhat.com/browse/RHEL-113820
    guestfs crashed when running aug-init during a conversion

https://issues.redhat.com/browse/RHEL-121728
    v2v can't convert guest with multiple windows OS on rhel10

https://issues.redhat.com/browse/RHEL-124569
    Windows migration failed: mkdtemp: /Windows/Temp/ESP_XXXXXX: No such file or directory [rhel-10.2]

https://issues.redhat.com/browse/RHEL-125116
    setfiles runs out of memory in glibc fts_read [rhel-10.2 doc fix]

https://issues.redhat.com/browse/RHEL-125956
    virt-inspector detect if AV/GPOs are present in a VM [virt-v2v]

https://issues.redhat.com/browse/RHEL-90175
    Should remove floppy device for the guest after v2v conversion [rhel-10.2]

https://issues.redhat.com/browse/RHEL-97600
    Virt-v2v fails to convert some guests with libguestfs error: e2fsck

https://issues.redhat.com/browse/RHEL-99313
    Improve the error info when converting a guest with less than 100 inodes by virt-v2v

https://issues.redhat.com/browse/RHEL-99745
    Improve info about guest must not be running or must be shut down in virt-v2v related man page [rhel-10.1]

https://github.com/libguestfs/virt-v2v/issues/100
    Please implement nbdkit-vddk-plugin's compression parameter in virt-v2v

SEE ALSO
virt-v2v(1).

AUTHORS
Authors of virt-v2v 2.10:

Alan Alberghini
Cole Robinson
Fco. Javier F. Serrador
Richard W.M. Jones
Ricky Tigg
Vadim Rozenfeld
Yuri Chornoivan

COPYRIGHT
Copyright (C) 2009-2026 Red Hat Inc.

LICENSE
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

BUGS
To get a list of bugs against libguestfs, use this link: https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

To report a new bug against libguestfs, use this link: https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

When reporting a bug, please supply:

•   The version of libguestfs.

•   Where you got libguestfs (eg. which Linux distro, compiled from source, etc)

•   Describe the bug accurately and give a way to reproduce it.

•   Run libguestfs-test-tool(1) and paste the complete, unedited output into the bug report.