• [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-22:03.hyperv

    From FreeBSD Errata Notices@21:1/5 to All on Tue Jan 11 21:00:04 2022
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    ============================================================================= FreeBSD-EN-22:03.hyperv Errata Notice
    The FreeBSD Project

    Topic: vPCI compatibility improvements with certain Hyper-V releases

    Category: core
    Module: hyperv
    Announced: 2022-01-11
    Credits: Microsoft OSTC
    Affects: All supported versions of FreeBSD.
    Corrected: 2021-11-30 07:43:32 UTC (stable/13, 13.0-STABLE)
    2022-01-11 18:14:59 UTC (releng/13.0, 13.0-RELEASE-p6)
    2021-12-14 12:20:17 UTC (stable/12, 12.3-STABLE)
    2022-01-11 18:19:26 UTC (releng/12.3, 12.3-RELEASE-p1)
    2022-01-11 18:33:14 UTC (releng/12.2, 12.2-RELEASE-p12)

    For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security
    branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>.

    I. Background

    Hyper-V is a hypervisor provided on Windows server by Microsoft. It
    supports vPCI, which is a virtualized bus driver used to expose hardware devices to virtual machines. FreeBSD provides drivers

    II. Problem Description

    A Hyper-V vPCI emulation change can cause SR-IOV (Single-Root I/O Virtualization) and DDA (Discrete Device Assignment) devices to fail to
    operate correctly under Hyper-V.

    In recent Hyper-V releases on Windows Server 2022, the vPCI code does
    not initialize the last 4 bit of device registers. This behavior change
    could result in failure to initialize guest drivers for SR-IOV or DDA
    devices.

    III. Impact

    SR-IOV and DDA devices may not work in FreeBSD running under certain
    Hyper-V releases.

    IV. Workaround

    No workaround is available, however systems not running within Hyper-V
    or Azure are unaffected.

    V. Solution

    Upgrade your system to a supported FreeBSD stable or release / security
    branch (releng) dated after the correction date.

    A reboot is required.

    Perform one of the following:

    1) To update your system via a binary patch:

    Systems running a RELEASE version of FreeBSD on the amd64, i386, or
    (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility:

    # freebsd-update fetch
    # freebsd-update install

    A reboot is required.

    2) To update your system via a source code patch:

    The following patches have been verified to apply to the applicable
    FreeBSD release branches.

    a) Download the relevant patch from the location below, and verify the
    detached PGP signature using your PGP utility.

    # fetch https://security.FreeBSD.org/patches/EN-22:03/hyperv.patch
    # fetch https://security.FreeBSD.org/patches/EN-22:03/hyperv.patch.asc
    # gpg --verify hyperv.patch.asc

    b) Apply the patch. Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch

    c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
    system.

    VI. Correction details

    This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches:

    Branch/path Hash Revision
    - ------------------------------------------------------------------------- stable/13/ d11e9de955ea stable/13-n248279 releng/13.0/ dfca965af4e1 releng/13.0-n244770 stable/12/ r371235 releng/12.3/ r371484 releng/12.2/ r371489
    - -------------------------------------------------------------------------

    For FreeBSD 13 and later:

    Run the following command to see which files were modified by a
    particular commit:

    # git show --stat <commit hash>

    Or visit the following URL, replacing NNNNNN with the hash:

    <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>

    To determine the commit count in a working tree (for comparison against
    nNNNNNN in the table above), run:

    # git rev-list --count --first-parent HEAD

    For FreeBSD 12 and earlier:

    Run the following command to see which files were modified by a particular revision, replacing NNNNNN with the revision number:

    # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

    Or visit the following URL, replacing NNNNNN with the revision number:

    <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

    VII. References

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-22:03.hyperv.asc> -----BEGIN PGP SIGNATURE-----

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