Re: FreeBSD image hangs during boot

[Aurelien Jarno <aurelien-rXXEIb44qovR7s880joybQ@public.gmane.org>]

On Tue, Oct 02, 2007 at 02:38:19PM +0200, Avi Kivity wrote:
> Aurelien Jarno wrote:
> > Avi Kivity a écrit :
> >   
> >> Aurelien Jarno wrote:
> >>     
> >>> Hi all,
> >>>
> >>> That's not something new, but I never seen the problem mentioned here.
> >>> FreeBSD does not work on KVM, approximately since the lapic merge.
> >>>
> >>> However, that does not seem related to lapic, as using -no-kvm-irqchip
> >>> does not help. With -no-kvm I get a page fault in kernel mode, while the
> >>> normal QEMU (0.9.0 or CVS) does not have this problem.
> >>>
> >>> This can be easily reproduced with the latest installation CD:
> >>> ftp://ftp.freebsd.org/pub/FreeBSD/ISO-IMAGES-i386/6.2/6.2-RELEASE-i386-bootonly.iso
> >>>
> >>>   
> >>>       
> >> It complains about the RSDT checksum.  Running with -no-acpi works 
> >> around the problem (it gets to some country selection screen).  So it 
> >> looks like the ACPI tables are messed up.
> >>     
> >
> > The RSDT checksum problem is not new, but it was harmless on previous
> > versions (like kvm-37).
> >
> > Using -no-acpi, I am able to boot the machine with -no-kvm, but the
> > guest still hang with -no-acpi and with -no-kvm-irqchip or lapic
> > enabled. At least on AMD64, I haven't tested yet on an Intel machine.
> >
> >   
> 
> Hangs on AMD here as well; works on intel (with -no-acpi).

I have finally found time to bisect the problem. The commit that has 
broken FreeBSD on AMD is already a bit old:


commit aa38840d3d2e0a804e628077df8d8879b496d741
Author: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
Date:   Sun Sep 9 14:12:54 2007 +0300

    KVM: Clean up unloved invlpg emulation

    invlpg shouldn't fetch the "src" address, since it may not be valid,
    however SVM's "solution" which neuters emulation of all group 7
    instruction is horrible and breaks kvm-lite.  The simplest fix is to
    put a special check in for invlpg.

    Signed-off-by: Rusty Russell <rusty-8n+1lVoiYb80n/F98K4Iww@public.gmane.org>
    Signed-off-by: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
 

-- 
  .''`.  Aurelien Jarno	            | GPG: 1024D/F1BCDB73
 : :' :  Debian developer           | Electrical Engineer
 `. `'   aurel32-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org         | aurelien-rXXEIb44qovR7s880joybQ@public.gmane.org
   `-    people.debian.org/~aurel32 | www.aurel32.net

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