139 lines
4.7 KiB
Text
139 lines
4.7 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-17:03.hyperv Errata Notice
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The FreeBSD Project
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Topic: Compatibility with Hyper-V/storage after KB3172614 or
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KB3179574
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Category: core
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Module: hyperv/storvsc
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Announced: 2017-02-23
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Credits: Microsoft OSTC
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Affects: FreeBSD 11.0-RELEASE
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Corrected: 2016-10-19 07:43:39 UTC (stable/11, 11.0-STABLE)
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2017-02-23 07:11:48 UTC (releng/11.0, 11.0-RELEASE-p8)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:https://security.FreeBSD.org/>.
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I. Background
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Hyper-V is a default hypervisor provided on Windows server by Microsoft.
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ATA driver is the legacy storage driver for FreeBSD on Hyper-V, now they
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are replaced by synthetic driver which has better performance. There are
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issues when attaching synthetic storage driver for FreeBSD 11 on some of
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Hyper-V hosts.
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II. Problem Description
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There are some compatibility issues with the FreeBSD Hyper-V driver,
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which will cause the OS disk to be detached if August 2016 update rollup
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is applied on Windows host (KB3172614 or KB3179574).
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III. Impact
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FreeBSD 11.0 can not be installed on a guest system on Hyper-V host.
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IV. Workaround
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On Hyper-V connection, when the installer boot prompt, select
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3. Escape to the loader prompt
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Then:
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set hw.ata.disk_enable=1
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boot.
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Note: this workaround force FreeBSD to use legacy storage driver
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which is much slower than synthetic driver.
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V. Solution
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Perform one of the following:
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1) Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date.
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Afterward, reboot the system.
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2) To update your system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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Afterward, reboot the system.
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3) To update your system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch https://security.FreeBSD.org/patches/EN-17:03/hyperv.patch
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# fetch https://security.FreeBSD.org/patches/EN-17:03/hyperv.patch.asc
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# gpg --verify hyperv.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile your kernel as described in
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<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
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system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/11/ r307617
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releng/11.0/ r314125
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212721>
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<URL:https://support.microsoft.com/en-au/help/24717/windows-8-1-and-windows-server-2012-r2-update-history>
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