FreeBSD Errata Notice FreeBSD-EN-20:13.bhyve
8 July, 2020 by firstname.lastname@example.org | freebsd
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-EN-20:13.bhyve Errata Notice The FreeBSD Project Topic: Host crash in bhyve with PCI device passthrough Category: core Module: bhyve Announced: 2020-07-08 Credits: Peter Grehan Affects: FreeBSD 12.1 Corrected: 2020-06-01 05:14:01 UTC (stable/12, 12.1-STABLE) 2020-07-08 19:56:34 UTC (releng/12.1, 12.1-RELEASE-p7) 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 bhyve(8) is a hypervisor that supports running a variety of guest operating systems in virtual machines. bhyve(8) includes support for PCI devices passthrough (a technique to pass host PCI devices to a virtual machine for its exclusive control and use). II. Problem Description When an attempt is made to pass through a PCI device to a bhyve(8) VM (causing initialization of IOMMU) on certain Intel chipsets using VT-d the PCI bus stops working entirely resulting in a host crash. This issue occurs at least on the Intel Skylake series processors and those released later. A device passed through to a guest VM running OpenBSD at least since version 6.4 on both AMD and Intel processors may not fully work in the guest. OpenBSD issues 4-byte PCI configuration-space register reads and writes to consecutive 2-byte fields, which were not handled correctly by bhyve(8). III. Impact These issues prevent using bhyve in production with some combinations of host hardware and/or guest operating system. IV. Workaround No workaround is available. Systems not using bhyve(8) for virtualization with PCI passthrough are not affected. V. Solution Upgrade your system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date and reboot. Perform one of the following: 1) To update your system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Rebooting for errata update" The first problem requires a reboot as the affected part is the kernel. The second problem does not require a reboot as the affected part is the bhyve userland executable. 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-20:13/bhyve.patch # fetch https://security.FreeBSD.org/patches/EN-20:13/bhyve.patch.asc # gpg --verify bhyve.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. d) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/12/ r361686 releng/12.1/ r363022 - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # 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 <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id"9852> <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id$5392> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:13.bhyve.asc> -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl8GLjVfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cKMwQ/9HxrcUNvL8myn512t+drnCnDg/lNL2cqlc53VyDsvwesgXbGA3k1pQsyV VLB2jn56+EWcq0b1eieLavK77YtdrbEfa72YOlTd576586VRroUC3d4o6eaAHKHS Hzm/Qh5cQM46065Eoshz8T+N1/RNmU0ANS19ogBmogqhbJwwQUSr402a/BGrTES+ +rx4ywmTOrmXxVQwAlRHp1/7pQ5PL3cK2ByYzuFjKjzNX3scHoMxOul2TC1bYwj6 IhBT7NNxQuY/g7gxGM/ndifOiJtAlsxJdccWxZAMdYv3mzhnM2vqCmdz8KjB7UKH 2XOKB1RwSq0b1FBsur8Z0Pg6AlIRcNW952mAn2UJxx9mh/oCSj0sqtdmAKu0EO1e Vn6+psOffB28ITvdBsf7D/3ixM8+jdAogFzW00iGPppF02QwM6FVxa3+mogOVtsv R+Fu381qwQmqvMtAEXOxQ6NiAk3fTan+VuEDB8FnYPEs5JkWef/fn4SPRUrr04hY yTkX8F3XID2XdSMTgJllQzhf1uCK3QT77Y0BcPJH+NPZIZiyKkROxqnpS7LGFlEs v8dLXTOFnaHfdrjefB/QCwLMTcX1AfN1n0OxQigtwKC1rvKHweaqZBEujtDmyMOm uFXhQjoT3o29i1O139Q/3yINEbVYn6U5INrW5ZUGt1nm/wL9PuA=mH7Y -----END PGP SIGNATURE----- _______________________________________________ email@example.com mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-announce To unsubscribe, send any mail to "firstname.lastname@example.org"