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From:   "Michael Kelley (LINUX)" <mikelley@microsoft.com>
To:     Ben Greear <greearb@candelatech.com>,
        Linux regressions mailing list <regressions@lists.linux.dev>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: RE: Hang loading initrd since last Friday.
Thread-Topic: Hang loading initrd since last Friday.
Thread-Index: AQHZfTr2qR4xve2R+0yhSMLHlSGWLq9H1EyAgAAlpYCAAT9/AIABJi8AgAAJFvCAAGIGgIAAAvTg
Date:   Fri, 5 May 2023 00:04:11 +0000
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From: Ben Greear <greearb@candelatech.com> Sent: Thursday, May 4, 2023 4:46=
 PM
>=20
> On 5/4/23 10:59, Michael Kelley (LINUX) wrote:
> > From: Ben Greear <greearb@candelatech.com> Sent: Thursday, May 4, 2023 =
10:23 AM
> >>
> >> On 5/3/23 16:49, Ben Greear wrote:
> >>> On 5/2/23 21:46, Linux regression tracking (Thorsten Leemhuis) wrote:
> >>>> On 03.05.23 04:31, Bagas Sanjaya wrote:
> >>>>> On Tue, May 02, 2023 at 02:03:33PM -0700, Ben Greear wrote:
> >>>>>>
> >>>>>> Pulling today's upstream 6.3+ tree, my system now hangs loading in=
itrd.
> >>>>
> >>>> Just to understand this properly: you mean after the boot loader sai=
d it
> >>>> loaded the initramfs, not when the kernel starts using it?
> >>>
> >>> I am bisecting...it appears to be .config related.=A0 If I skip enabl=
ing things
> >>> during bisect, then I do not see the problem.=A0 But I copied my orig=
inal buggy .config
> >>> into an otherwise good kernel commit, and now it fails.=A0 I'm manual=
ly bisecting
> >>> the .config settings....
> >>
> >> I had enabled this option:  CONFIG_HYPERV_VTL_MODE
> >>
> >> And that makes it not boot.  Not sure that is expected or not, but
> >> I will simply un-select it and continue on, as I do not actually need =
that feature.
> >>
> >
> > What you observed is expected when CONFIG_HYPERV_VTL_MODE is selected,
> > which is why it defaults to N.  The comment for that option in the Kcon=
fig file says:
> >
> > 	  Select this option to build a Linux kernel to run at a VTL other tha=
n
> > 	  the normal VTL0, which currently is only VTL2.  This option
> > 	  initializes the x86 platform for VTL2, and adds the ability to boot
> > 	  secondary CPUs directly into 64-bit context as required for VTLs oth=
er
> > 	  than 0.  A kernel built with this option must run at VTL2, and will
> > 	  not run as a normal guest.
>=20
> I didn't read it close enough, but that is my fault.
>=20

No problem. :-)   Just FYI, in the future if you are come across issues
specifically related to running Linux as a guest on Hyper-V, feel free
to copy the linux-hyperv@vger.kernel.org mailing list.  That may
elicit faster help from someone with Hyper-V expertise and potentially
save you some trouble.

Michael