From owner-freebsd-virtualization@freebsd.org Mon May 17 06:47:31 2021 Return-Path: Delivered-To: freebsd-virtualization@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id BE3D563E464 for ; Mon, 17 May 2021 06:47:31 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4Fk8nt6lKsz4m1J for ; Mon, 17 May 2021 06:47:30 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.16.1/8.16.1) with ESMTPS id 14H6lMFv041780 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Mon, 17 May 2021 09:47:25 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 14H6lMFv041780 Received: (from kostik@localhost) by tom.home (8.16.1/8.16.1/Submit) id 14H6lMGA041779; Mon, 17 May 2021 09:47:22 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Mon, 17 May 2021 09:47:22 +0300 From: Konstantin Belousov To: Wei Hu Cc: Harry Schmalzbauer , Chris Knight , "freebsd-virtualization@freebsd.org" Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on tom.home X-Rspamd-Queue-Id: 4Fk8nt6lKsz4m1J X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=gmail.com (policy=none); spf=softfail (mx1.freebsd.org: 2001:470:d5e7:1::1 is neither permitted nor denied by domain of kostikbel@gmail.com) smtp.mailfrom=kostikbel@gmail.com X-Spamd-Result: default: False [-1.00 / 15.00]; ARC_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; DMARC_POLICY_SOFTFAIL(0.10)[gmail.com : No valid SPF, No valid DKIM,none]; TO_DN_EQ_ADDR_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; FREEMAIL_FROM(0.00)[gmail.com]; RCVD_TLS_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; HAS_XAW(0.00)[]; RBL_DBL_DONT_QUERY_IPS(0.00)[2001:470:d5e7:1::1:from]; R_SPF_SOFTFAIL(0.00)[~all:c]; NEURAL_SPAM_SHORT(1.00)[0.998]; SPAMHAUS_ZRD(0.00)[2001:470:d5e7:1::1:from:127.0.2.255]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-0.996]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; FREEMAIL_CC(0.00)[omnilan.de,gmail.com,freebsd.org]; MAILMAN_DEST(0.00)[freebsd-virtualization]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 May 2021 06:47:31 -0000 On Mon, May 17, 2021 at 06:33:19AM +0000, Wei Hu wrote: > > -----Original Message----- > > From: Konstantin Belousov > > Sent: Monday, May 17, 2021 1:47 PM > > To: Wei Hu > > Cc: Harry Schmalzbauer ; Chris Knight > > ; freebsd-virtualization@freebsd.org > > Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root > > > > On Mon, May 17, 2021 at 04:12:20AM +0000, Wei Hu wrote: > > > Copy Kib who was the author of PTI and other relate patches. > > > > > > This looks to be caused by Meltdown and Spectre mitigation patches > > > which were checked into head couple years ago. See this link for details about > > these patches: > > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki > > > .freebsd.org%2FSpeculativeExecutionVulnerabilities&data=04%7C01%7C > > > > > weh%40microsoft.com%7Cd7b33cd5fc774c88310008d918f744c4%7C72f988bf > > 86f14 > > > > > 1af91ab2d7cd011db47%7C1%7C0%7C637568272592647219%7CUnknown%7 > > CTWFpbGZsb > > > > > 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > > 3D% > > > > > 7C1000&sdata=5HjRc67IiHlrpR5bgWwJq9opMwBKudlHJpElsDZkS4A%3D& > > amp;re > > > served=0 > > > > > > The amd64 patches also caused problems on Hyper-V (triple fault) when > > > vmbus and other HyperV drivers (netvsc, storvsc etc) were loaded > > > separately. The workaround for this on amd64 is either build these > > > Hyper-V modules into the kernel or completely disable mitigation by > > > setting vm.pmap.pti="0" in /boot/loader.conf in the affect FreeBSD guests. > > > > > For amd64 I posted the patch to supposedly fix the issue, you did not > > responded. > > > I am sorry I might have missed your review request. Would you please let me > know the link to the patch or the commit if you already have checked in? I will > need to test and inform the parties who got affected. It was mailed for you after your query, then I pinged you several times. Anyway, look at and try https://reviews.freebsd.org/D30310 > > For the issue on i386, any plan to fix it. > > Thanks, > Wei