Re: Major KVM issues with kernel 4.5 on the host

From	Borislav Petkov <bp@alien8.de>
Newsgroups	linux.kernel
Subject	Re: Major KVM issues with kernel 4.5 on the host
Date	2016-04-21 14:40 +0200
Message-ID	<rqm3N-Ju-35@gated-at.bofh.it> (permalink)
References	(4 earlier) <rnzJV-74K-51@gated-at.bofh.it> <rnBC2-8vj-15@gated-at.bofh.it> <rnE6S-1XS-7@gated-at.bofh.it> <rnI0O-54S-9@gated-at.bofh.it> <rqitb-6j1-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Apr 21, 2016 at 10:39:48AM +0200, Marc Haber wrote:
> Currently, I cannot explain how this has happened, I must have flagged
> an actually good kernel as bad from my understanding of git bisect.
> 
> Can you give advice how to continue here?

Yap, sounds like you marked a bisection step incorrectly, which lead
into the wrong direction. How reliable is your reproducer?

Also, do the bisection as Paolo suggested:

* try 45bdbcfdf241.

* then do

$ git bisect start v4.5-rc1 v4.4

which marks -rc1 as bad and 4.4 as good.

While you're doing that bisect, do what Paolo said by applying the diff
here

  https://lkml.kernel.org/r/570EADD2.8030300@redhat.com

when the bisection point you're at at each step contains

  46896c73c1a4 ("KVM: svm: add support for RDTSCP")

You should apply the above hunk by doing

$ patch -p1 --dry-run -i /tmp/hunk

If it applies fine, you then apply it

$ patch -p1 -i /tmp/hunk

All clear?

If not, do not hesitate to ask.

Thanks

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.

Thread

Re: Major KVM issues with kernel 4.5 on the host Marc Haber <mh+linux-kernel@zugschlus.de> - 2016-04-21 10:50 +0200
  Re: Major KVM issues with kernel 4.5 on the host Borislav Petkov <bp@alien8.de> - 2016-04-21 14:40 +0200
    Re: Major KVM issues with kernel 4.5 on the host Marc Haber <mh+linux-kernel@zugschlus.de> - 2016-04-21 17:00 +0200
      Re: Major KVM issues with kernel 4.5 on the host Borislav Petkov <bp@alien8.de> - 2016-04-21 19:00 +0200
        Re: Major KVM issues with kernel 4.5 on the host Marc Haber <mh+linux-kernel@zugschlus.de> - 2016-04-21 22:10 +0200
          Re: Major KVM issues with kernel 4.5 on the host Borislav Petkov <bp@alien8.de> - 2016-04-23 18:10 +0200
            Re: Major KVM issues with kernel 4.5 on the host Marc Haber <mh+linux-kernel@zugschlus.de> - 2016-04-23 20:50 +0200
              Re: Major KVM issues with kernel 4.5 on the host "Dr. David Alan Gilbert" <dave@treblig.org> - 2016-04-23 21:20 +0200
              Re: Major KVM issues with kernel 4.5 on the host Borislav Petkov <bp@alien8.de> - 2016-04-24 02:00 +0200

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