Re: [REGRESSION][x86] Commit f5b2831d65 cause boot failure in VMware ESXi 5.1 guest

[Qu Wenruo]

-------- Original Message --------
Subject: Re: [REGRESSION][x86] Commit f5b2831d65 cause boot failure in 
VMware ESXi 5.1 guest
From: Juergen Gross <jgross@xxxxxxxx>
To: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Date: 2014å12æ27æ 21:51
> On 12/26/2014 02:57 AM, Qu Wenruo wrote:
> > Hi all,
> >
> > When testing v3.19-rc1 kernel(in fact, try to test), the kernel itself
> > fail to boot on VMware ESXi 5.1 guest.
> > The boot failure is quite easy to describe, only one line is output:
> > "Probing EDD (edd=off to disable)...ok"
> >
> > No other output(including warning/bug_on/backtrace or whatever) and the
> > guest just hangs.
> > It's OK on v3.18, so it's a regression.
> >
> > Bisect points to the following commit:
> > commit f5b2831d654167d77da8afbef4d2584897b12d0c
> > Author: Juergen Gross <jgross@xxxxxxxx>
> > Date:   Mon Nov 3 14:02:02 2014 +0100
> >
> >      x86: Respect PAT bit when copying pte values between large and
> > normal pages
> >
> >      The PAT bit in the ptes is not moved to the correct position when
> >      copying page protection attributes between entries of different 
> > sized
> >      pages. Translate the ptes according to their page size.
> >
> >
> > I have also created the kernel BZ report:
> > https://bugzilla.kernel.org/show_bug.cgi?id=90321
> >
> > Hopes this can be resolved in next rc.
>
> As the same issue has been reported with VMWare workstation which was
> related to an error in the PAT MSR emulation of VMWare, I guess this
> will be the same problem. I've already sent a patch.
>
> You should be able to boot with the "nopat" kernel option.
>
>
> Juergen
Thanks for the explanation. Again the closed source blob to blame.

Anyway, the nopat option works.

Great thanks
Qu
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