Re: [Xen-devel] Xen 4.12.0-rc Hangs Around masked ExtINT on CPU#

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Apr 16, 2019 at 09:23:11AM -0700, John L. Poole wrote:
> 
> On 3/27/2019 7:21 AM, Jan Beulich wrote:
> > > > > On 27.03.19 at 14:25, <jlpoole56@xxxxxxxxx> wrote:
> > > On 3/27/2019 1:14 AM, Jan Beulich wrote:
> > > > > > > On 26.03.19 at 18:21, <jlpoole56@xxxxxxxxx> wrote:
> > > > > zeta /usr/local/src/xen # cat xen/.config |grep CONFIG_HVM
> > > > > # CONFIG_HVM is not set
> > > > > zeta /usr/local/src/xen #
> > > > > 
> > > > > # tried 2 boot attempts
> > > > > log at: https://pastebin.com/nL4BWJ6Y
> > > > > 
> > > > > Hang points at lines:
> > > > Thanks for trying anyway; one further possibility eliminated. Looking
> > > > at the logs I've had another thought (wild guess again, so not really
> > > > much hope): Could you try "mwait-idle=no"?
> > > > 
> > > I modified man_xen.cfg by adding at the end the kernel parameter:
> > > 
> > > mwait-idle=no
> > > 
> > > Rebooted.
> > > Result: hung:
> > Thanks. I'm afraid I'm out of ideas for the moment.
> > 
> > Jan
> > 
> > 
> Jan,
> 
> Recall, the Xen kernel successfully launched in 2017 when I first built
> Xen in Gentoo, that was about version 4.7.1.  I had to launch it
> from an EFI console.  I've tried to revert back to 4.7.1 and
> build a kernel and I have found it too difficult as certain
> dependencies have since been removed from Gentoo.

Unless some of us can get our hands on one of such systems I think
your best bet would be to try to bisect the changes between 4.7 and
4.8 if 4.7 was indeed working on your system.

Note that you only need to build the Xen hypervisor (make xen) in
order to bisect this issue, there's no need to build the tools at
all, which is where almost all of the dependencies come from. The
hypervisor is mostly standalone and only have dependencies on a
couple of tools.

Roger.

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