Re: [Xen-devel] Re: [PATCH] xen: mask XSAVE in cpuid since we don't allow guests to use it

[Boris Derzhavets <bderzhavets@xxxxxxxxx>]

I didn't get a chance to notice the last good version , because pygrub stopped working (return no data ) right after XSAVE patch (for myself, of course) .
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Then i followed
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Re: [PATCH] xen: mask XSAVE in cpuid since we don't allow guests to use it
Monday, March 9, 2009 7:26 AM
From:
"Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>
Add sender to Contacts
To:
"bderzhavets@xxxxxxxxx" <bderzhavets@xxxxxxxxx>
Cc:
"Xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
If you¹re using a recent xen-unstable then you might try again with the
current tip. A couple of changes went in recently (including one fix today).

-- Keir
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and turned into current issues
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--- On Wed, 3/11/09, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH] xen: mask XSAVE in cpuid since we don't allow guests to use it
To: bderzhavets@xxxxxxxxx
Cc: "Xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>
Date: Wednesday, March 11, 2009, 1:04 PM

Boris Derzhavets wrote:
> >Could you try bisecting xen-unstable to see which change started
failing for
> >you?  There were some recent changes to the hotplug scripts which
could have
> > introduced a problem.
> No. It's above me.
>         

If you're fetching xen-unstable with "hg" and building it, then
you have everything you need to do bisection:

  1. hg bisect -r
  2. hg bisect -g <known good
 version>
  3. hg bisect -b <known bad version>
  4. build as usual and test
        1. if works: hg bisect -g
        2. if not: hg bisect -b
  5. repeat 4 until first bad version has been isolated

Thanks,
   J

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