Date: Mon, 17 May 2021 06:33:19 +0000 From: Wei Hu <weh@microsoft.com> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Harry Schmalzbauer <freebsd@omnilan.de>, Chris Knight <stryqx@gmail.com>, "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: RE: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root Message-ID: <PSAP153MB0440A1511904E54767BF5344BB2D9@PSAP153MB0440.APCP153.PROD.OUTLOOK.COM> In-Reply-To: <YKIDX/PjOlNc%2BtMa@kib.kiev.ua> References: <CAHgj5TTKdiOU4bRu3SCBwKqnQaMqxUFynodh5MLBE7%2BycBiPYw@mail.gmail.com> <SG2P153MB0208B4185C3EB54120F10E74BB030@SG2P153MB0208.APCP153.PROD.OUTLOOK.COM> <c6013e67-4a37-43e1-4452-568d3ef6e5a7@omnilan.de> <ef85f9bb-ad8b-978e-da65-c887e8e8498e@omnilan.de> <PSAP153MB0440FD09AD1981FD569B7246BB2D9@PSAP153MB0440.APCP153.PROD.OUTLOOK.COM> <YKIDX/PjOlNc%2BtMa@kib.kiev.ua>
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> -----Original Message----- > From: Konstantin Belousov <kostikbel@gmail.com> > Sent: Monday, May 17, 2021 1:47 PM > To: Wei Hu <weh@microsoft.com> > Cc: Harry Schmalzbauer <freebsd@omnilan.de>; Chris Knight > <stryqx@gmail.com>; freebsd-virtualization@freebsd.org > Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root >=20 > 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 detail= s about > these patches: > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwik= i > > .freebsd.org%2FSpeculativeExecutionVulnerabilities&data=3D04%7C01%7= C > > > weh%40microsoft.com%7Cd7b33cd5fc774c88310008d918f744c4%7C72f988bf > 86f14 > > > 1af91ab2d7cd011db47%7C1%7C0%7C637568272592647219%7CUnknown%7 > CTWFpbGZsb > > > 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0% > 3D% > > > 7C1000&sdata=3D5HjRc67IiHlrpR5bgWwJq9opMwBKudlHJpElsDZkS4A%3D& > amp;re > > served=3D0 > > > > 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=3D"0" in /boot/loader.conf in the affect FreeBSD gu= ests. > > > For amd64 I posted the patch to supposedly fix the issue, you did not > responded. >=20 I am sorry I might have missed your review request. Would you please let me= =20 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.=20 For the issue on i386, any plan to fix it. Thanks, Wei
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