Date: Fri, 4 Mar 2022 12:52:04 -0500 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: Mark Johnston <markj@freebsd.org> Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 84369dd52369 - main - x86: Probe the TSC frequency earlier Message-ID: <20220304175204.jxcct5ozw343owj7@mutt-hbsd> In-Reply-To: <YiImCASpN1nmlOHY@nuc> References: <202203011439.221EdtpY038505@gitrepo.freebsd.org> <20220304142447.bmo7r6syd6gsunnt@mutt-hbsd> <YiImCASpN1nmlOHY@nuc>
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--adexosk3owlosdod Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Mar 04, 2022 at 09:45:28AM -0500, Mark Johnston wrote: > On Fri, Mar 04, 2022 at 09:24:47AM -0500, Shawn Webb wrote: > > On Tue, Mar 01, 2022 at 02:39:55PM +0000, Mark Johnston wrote: > > > The branch main has been updated by markj: > > >=20 > > > URL: https://cgit.FreeBSD.org/src/commit/?id=3D84369dd52369cbae28970d= ca20a53d3de1719907 > > >=20 > > > commit 84369dd52369cbae28970dca20a53d3de1719907 > > > Author: Mark Johnston <markj@FreeBSD.org> > > > AuthorDate: 2022-03-01 14:39:35 +0000 > > > Commit: Mark Johnston <markj@FreeBSD.org> > > > CommitDate: 2022-03-01 14:39:35 +0000 > > >=20 > > > x86: Probe the TSC frequency earlier > > > =20 > > > This lets us use the TSC to implement early DELAY, limiting the u= se of > > > the sometimes-unreliable 8254 PIT. > > > =20 > > > PR: 262155 > > > Reviewed by: emaste > > > Tested by: emaste, mike tancsa <mike@sentex.net>, Stefan Heg= nauer <stefan.hegnauer@gmx.ch> > > > MFC after: 1 month > > > Sponsored by: The FreeBSD Foundation > > > Differential Revision: https://reviews.freebsd.org/D34367 > > > --- > > > sys/amd64/amd64/machdep.c | 14 +++++- > > > sys/i386/i386/machdep.c | 11 ++++- > > > sys/x86/include/clock.h | 3 +- > > > sys/x86/isa/clock.c | 4 +- > > > sys/x86/x86/tsc.c | 123 +++++++++++++++++++++++++-----------= ---------- > > > 5 files changed, 94 insertions(+), 61 deletions(-) > >=20 > > Hey Mark, > >=20 > > Something about this commit breaks booting in Hyper-V. Reverting this > > particular commit makes Hyper-V happy again. >=20 > How far into bootup do we get? Is there a panic? Sorry for the delay. I've plopped a screenshot here: https://hardenedbsd.org/~shawn/2022-03-04_tsc-01.png Thanks, --=20 Shawn Webb Cofounder / Security Engineer HardenedBSD https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A= 4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc --adexosk3owlosdod Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmIiUcEACgkQ/y5nonf4 4fr5Ww/+L9JwR5HovMtVn7Yyswq1qbmFF0OMe3masA4KPbFKtGzBFxQeiv9apYkQ 6X1jZeK/kgfafQR7mkqSrXmGD1F17HpSpTXhzC6Z7e3kyoLHSV8q19dMLr4x3xvc m62XPaY5j4vj67fSafP07zGNQ4+ewDwMjwbYedXGAEneTkUwKbon2boXTyFjqagw RXIPWFLXO6LYYAqqMPlsSXsX3cJEKdFJCm6jugw2uzAjgBLpu6fkJPs3LKAgf7tr AQGjU6CgpAnFXwNBfXy0TxuE2AP8mRxLM20T174i7vX9XteR5yNJV5y7tPYzySd+ wsc3b0m4pxINiUWGmaDSvnIPVaQ2QzMmDFSuqFJjpoUGd/hSlYkPWYd+eU4o1SZi SQ6scrBzhA7klNQmzaV4sS7sBM/4PM+6B0FgmnmJZkqXN0YyjDTVQIGlcaSUvx8v mUM33gN48eINqHpIdQQOFDMrw8665SE1Smil/dEhdiIAHrb0RZEGAMlFsRMa//iG /XiQIEOpqEYfg9KO6WhYiqXOaxyg5/6GNKYyIQ4dVSroNxbIBy6QZm1l3rNXy+JE 7LxgMCUlBKTiF19XCQT8iRU/aL3jH7j2TWVMhETcBgFBFLWRg4yXyj3s8wBOI+xh 45CqyacuypdZBOhIVz2ffiyok69yw3MaEV8rAPqnvT1WeYwWeSg= =rkgp -----END PGP SIGNATURE----- --adexosk3owlosdod--
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