Date: Fri, 4 Mar 2022 13:15:29 -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: <20220304181529.isvkyyx3qwcbt6v7@mutt-hbsd> In-Reply-To: <20220304175226.avi2r57dvjfeyr7w@mutt-hbsd> References: <202203011439.221EdtpY038505@gitrepo.freebsd.org> <20220304142447.bmo7r6syd6gsunnt@mutt-hbsd> <YiIsshB5MgS6QdU3@nuc> <20220304175226.avi2r57dvjfeyr7w@mutt-hbsd>
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--r3y2smx2fgxhxjo5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Mar 04, 2022 at 12:52:26PM -0500, Shawn Webb wrote: > On Fri, Mar 04, 2022 at 10:13:54AM -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=3D84369dd52369cbae2897= 0dca20a53d3de1719907 > > > >=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= use of > > > > the sometimes-unreliable 8254 PIT. > > > > =20 > > > > PR: 262155 > > > > Reviewed by: emaste > > > > Tested by: emaste, mike tancsa <mike@sentex.net>, Stefan H= egnauer <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 > > The patch below might be sufficient. I'll test it in Azure but it'll > > take me some time. > >=20 > > diff --git a/sys/x86/x86/delay.c b/sys/x86/x86/delay.c > > index c767250954da..95b994b15f81 100644 > > --- a/sys/x86/x86/delay.c > > +++ b/sys/x86/x86/delay.c > > @@ -89,7 +89,7 @@ delay_tc(int n) > > return (1); > > } > > tc =3D timecounter; > > - if (tc->tc_quality <=3D 0) > > + if (tc =3D=3D NULL || tc->tc_quality <=3D 0) > > return (0); > > func =3D tc->tc_get_timecount; > > mask =3D tc->tc_counter_mask; >=20 > Great! I'll give this patch a try and report back. The proposed patch did not result in successful boot. Thanks, --=20 Shawn Webb Cofounder / Security Engineer HardenedBSD https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A= 4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc --r3y2smx2fgxhxjo5 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEA6TL67gupaZ9nzhT/y5nonf44foFAmIiVz8ACgkQ/y5nonf4 4foLohAAiBo3ClnnnF3v20LZ5sOtjGsSDELLTIhbScaj2kTfBXpZ+lFyK91WZUkl hTkcFH+J608AKblZMsk8pS1e0hN7rvyq/tRHKI445WEzf9gH11uKS+oyzPUE/qCL arsx4/T69sjNef7Dz/bs4cwOTKhctqnDPZ98RREzdsCFN89IFu2s5T2wSHvqyAGE Z3Mw7k9lKFI1OzOAMHFLCd8NTEpjdfLlSHzKr1SR+BLB1tddLsJ3tPhceFsYTPsv +FZOJQQGQh4IWJOD3J06FONk5WWlFryzAtU6HouO4uQVJCvL3lbMMyYY66AbOAgL xTUIKSeoWP4jMnerWNTIzYbNB8wkN8xAa5vtqi1BIXQS4YtmlVQPX8xPH4ysGT/3 PIeRzS+BWxNCGX1kcvXb/vlxMERelDgVdAb+jnly/a580RtwIlhmC9J2z2UC6Yhh 0nC0VyHfZEykTNJgCuhIWVyuO7386UcHTI8mjsFbxquKC7ImBHCUFXYM170GJt5d TvdCUKI+mrdXHBrlMkjlwXVNkrst0wCYF1WVjJxuXSSzn+SdET1v8kFftUA5sLr9 qKG6Re6Vff0ZDut8bnzifudch9AxBMqcA9J4UC20oo+VGnFmPMjNG+GhY46Q1ujk B9BII44wgHn8RS5uCF7A7x5LOnRqCyktXOgFpw2Q7gRB1Yppa40= =q52t -----END PGP SIGNATURE----- --r3y2smx2fgxhxjo5--
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