Re: [Xen-users] problem building a PAE system

[AndreGround <andreground@xxxxxxxxx>]

I would like to have PAE off in my dom0 cause I think that is the
reason why I'm unable to start my old FC3 domU.

I know that it would probably go fine if I choose the XenSource way
but I really want to find an answer to this question...is it
impossible to build both Kernel & HV with PAE disabled starting from
SRPMs using FC6? Why if I turn off PAE in the .spec file I always get
PAE mismatch error (dom0=yes)? How could dom0 be PAE enabled if I'm
rebuilding kernels?

Second thing is that I would like not to lose Fedora's updates to
Kernel & HV and going for the SRPMs is the only way to get this.

There must be a way :)

Thanks again,
Andrea

On 2/3/07, Robert Hatch <robert.hatch@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Can I ask why you want pae off?  Your system obviously supports it as
> the dom0 would not boot so why must pae be off in the domU's?
>
> Anyway the solution to your problem is probably to either build xen from
> source (hypervisor and xen kernel) or use the half way house of
> downloading and installing the binary have a look here:
> http://www.xensource.com/download/dl_304tarballs.html
>
> In binary you can choose whether to use a pae or non-pae hypervisor
> which comes prebuilt with an appropriate kernel.  I prefer building the
> whole thing from source as I do a lot of devel but to get going the
> binary is fine. (just make sure you make the initrd and check/add the
> grub conf when you install)
>
> rob
>
> p.s. remove the rpm's and reboot first just to be on the safe side
>
>
> -----Original Message-----
> From: AndreGround [mailto:andreground@xxxxxxxxx]
> Sent: 02 February 2007 22:17
> To: Robert Hatch; xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] problem building a PAE system
>
> Thanks for your reply Robert. Any help/idea is *REALLY* appreciated.
>
> The problem is that I don't want PAE enabled :)
> Fedora provides both kernel & HV RPMs with PAE enabled.
>
> I'm actually trying to build both kernel & HV from Fedora's RPMs in
> order to disable PAE support but I can't get them working as I always
> stop @ the same point. "PAE mismatch between xen and dom0 (xen=no
> dom0=yes)" when loading my brand new kernel.
>
> As you can see from the .spec file I've posted, I've disabled any
> PAE-related flag.
>
> So, now, I have a lot of doubts:
> 1) Why it happens?
> 2) What does it exactly mean with dom0=yes?
> 3) Does Fedora RPMs include, build and install also the hypervisor?
> 4) Why Fedora Xen RPMs .spec file doesn't talk about PAE support?
> 5) ... and so on ...
>
> Please help me...I'm going crazy! :)
>
> Andrea
>
> On 2/2/07, Robert Hatch <robert.hatch@xxxxxxxxxxxxxxxx> wrote:
> > Have you installed the PAE hypervisor? As I understand it you need the
> > kernel and hypervisor to match i.e. both need to be PAE (or in you
> case
> > not) otherwise you get this message.
> >
> > Hope this helps
> >
> > Rob
> >
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> AndreGround
> > Sent: 02 February 2007 16:15
> > To: Daniel P. Berrange
> > Cc: Petersson, Mats; Emiliano Gabrielli (aka AlberT);
> > xen-users@xxxxxxxxxxxxxxxxxxx; Nico Kadel-Garcia
> > Subject: Re: [Xen-users] problem building a PAE system
> >
> > Hi!
> > with this .spec file, I get a brand new kernel from source with PAE
> > disabled but I always get "PAE mode mismatch between Xen and DOM0
> > (xen=no, dom0=yes) when I try to start it!
> >
> > Where's the mistake?
> >
> > Thanks in advance!
> >
> > .spec file:
> >
> > Summary: The Linux kernel (the core of the Linux operating system)
> >
> > # What parts do we want to build?  We must build at least one kernel.
> > # These are the kernels that are built IF the architecture allows it.
> >
> > %define buildup 1
> > # Only used on archs without run-time support (ie ppc, sparc64)
> > %define buildsmp 0
> > %define buildpae 0
> > # Whether to apply the Xen patches, leave this enabled.
> > %define includexen 1
> > # Whether to build the Xen kernels, disable if you want.
> > %define buildxen 1
> > %define builddoc 0
> > %define buildkdump 1
> > %define buildheaders 1
> > %define builddebug 0
> >
> > # Versions of various parts
> >
> > # After branching, please hardcode these values as the
> > # %dist and %rhel tags are not reliable yet
> > # For example dist -> .el5 and rhel -> 5
> > #% define dist .XX
> > #% define rhel Y
> >
> > #
> > # Polite request for people who spin their own kernel rpms:
> > # please modify the "release" field in a way that identifies
> > # that the kernel isn't the stock distribution kernel, for example by
> > # adding some text to the end of the version number.
> > #
> > %define sublevel 19
> > %define kversion 2.6.%{sublevel}
> > %define rpmversion 2.6.%{sublevel}
> > %define release %(R="$Revision: 1.2895dru $"; RR="${R##: }"; echo
> > ${RR%%?})%{?dist}
> > %define signmodules 0
> > %define xen_hv_cset 11774
> > %define make_target bzImage
> > %define kernel_image x86
> > %define xen_flags verbose=y crash_debug=y
> > %define xen_target vmlinuz
> > %define xen_image vmlinuz
> >
> > %define KVERREL %{PACKAGE_VERSION}-%{PACKAGE_RELEASE}
> > %define hdrarch %_target_cpu
> >
> > # groups of related archs
> > #OLPC stuff
> > %if 0%{?olpc}
> > %define buildxen 0
> > %define buildkdump 0
> > %endif
> > # Don't build 586 kernels for RHEL builds.
> > %if 0%{?rhel}
> > %define all_x86 i386 i686
> > # we differ here b/c of the reloc patches
> > %ifarch i686 x86_64
> > %define buildkdump 0
> > %endif
> > %else
> > %define all_x86 i386 i586 i686
> > %endif
> >
> > # Override generic defaults with per-arch defaults
> >
> > %ifarch noarch
> > %define builddoc 1
> > %define buildup 0
> > %define buildheaders 0
> > %define all_arch_configs $RPM_SOURCE_DIR/kernel-%{kversion}-*.config
> > %endif
> >
> > # Do debug builds on i686, x86_64
> > %ifarch i686 x86_64
> > %define builddebug 1
> > %endif
> >
> > # kdump only builds on i686, x86_64, ppc64 ...
> > %ifnarch i686 x86_64 ppc64 ppc64iseries
> > %define buildkdump 0
> > %endif
> >
> > # Xen only builds on i686, x86_64 and ia64 ...
> > %ifnarch i686 x86_64 ia64
> > %define buildxen 0
> > %endif
> >
> > # Second, per-architecture exclusions (ifarch)
> >
> > %ifarch ppc64iseries i686 i586
> > %define buildheaders 0
> > %endif
> >
> > %ifarch %{all_x86}
> > %define all_arch_configs
> $RPM_SOURCE_DIR/kernel-%{kversion}-i?86*.config
> > %define image_install_path boot
> > %define signmodules 0
> > %define hdrarch i386
> > %endif
> >
> > %ifarch i686
> > %define buildpae 0
> > # we build always xen HV with pae
> > %define xen_flags verbose=y crash_debug=y pae=n
> > %endif
> >
> > %ifarch x86_64
> > %define all_arch_configs
> > $RPM_SOURCE_DIR/kernel-%{kversion}-x86_64*.config
> > %define image_install_path boot
> > %define signmodules 0
> > %endif
> >
> > %ifarch ppc64 ppc64iseries
> > %define all_arch_configs
> > $RPM_SOURCE_DIR/kernel-%{kversion}-ppc64*.config
> > %define image_install_path boot
> > %define signmodules 0
> > %define make_target vmlinux
> > %define kernel_image vmlinux
> > %define kernel_image_elf 1
> > %define hdrarch powerpc
> > %endif
> >
> > %ifarch s390
> > %define all_arch_configs
> $RPM_SOURCE_DIR/kernel-%{kversion}-s390*.config
> > %define image_install_path boot
> > %define make_target image
> > %define kernel_image arch/s390/boot/image
> > %endif
> >
> > %ifarch s390x
> > %define all_arch_configs
> $RPM_SOURCE_DIR/kernel-%{kversion}-s390x.config
> > %define image_install_path boot
> > %define make_target image
> > %define kernel_image arch/s390/boot/image
> > %define hdrarch s390
> > %endif
> >
> > %ifarch sparc
> > %define all_arch_configs
> $RPM_SOURCE_DIR/kernel-%{kversion}-sparc.config
> > %define make_target image
> > %define kernel_image image
> > %endif
> >
> > %ifarch sparc64
> > %define buildsmp 1
> > %define all_arch_configs
> > $RPM_SOURCE_DIR/kernel-%{kversion}-sparc64*.config
> > %define make_target image
> > %define kernel_image image
> > %endif
> >
> > %ifarch ppc
> > %define all_arch_configs
> > $RPM_SOURCE_DIR/kernel-%{kversion}-ppc{-,.}*config
> > %define image_install_path boot
> > %define make_target vmlinux
> > %define kernel_image vmlinux
> > %define kernel_image_elf 1
> > %define buildsmp 1
> > %define hdrarch powerpc
> > %endif
> >
> > %ifarch ia64
> > %define all_arch_configs
> $RPM_SOURCE_DIR/kernel-%{kversion}-ia64*.config
> > %define image_install_path boot/efi/EFI/redhat
> > %define signmodules 0
> > %define make_target compressed
> > %define kernel_image vmlinux.gz
> > # ia64 xen HV doesn't building with debug=y at the moment
> > %define xen_flags verbose=y crash_debug=y
> > %define xen_target compressed
> > %define xen_image vmlinux.gz
> > %endif
> >
> > # To temporarily exclude an architecture from being built, add it to
> > # %nobuildarches. Do _NOT_ use the ExclusiveArch: line, because if we
> > # don't build kernel-headers then the new build system will no longer
> > let
> > # us use the previous build of that package -- it'll just be
> completely
> > AWOL.
> > # Which is a BadThing(tm).
> >
> > # We don't build a kernel on i386 or s390x -- we only do
> kernel-headers
> > there.
> > # We also don't support s390, iseries and ia64 on Fedora.
> > %define nobuildarches i386 s390 s390x ppc64iseries ia64
> >
> > %ifarch %nobuildarches
> > %define buildup 0
> > %define buildsmp 0
> > %define buildpae 0
> > %define buildxen 0
> > %define buildkdump 0
> > %define _enable_debug_packages 0
> > %endif
> >
> >
> > #
> > # Three sets of minimum package version requirements in the form of
> > Conflicts:
> > # to versions below the minimum
> > #
> >
> > #
> > # First the general kernel 2.6 required versions as per
> > # Documentation/Changes
> > #
> > %define kernel_dot_org_conflicts  ppp < 2.4.3-3, isdn4k-utils <
> > 3.2-32, nfs-utils < 1.0.7-12, e2fsprogs < 1.37-4, util-linux < 2.12,
> > jfsutils < 1.1.7-2, reiserfs-utils < 3.6.19-2, xfsprogs < 2.6.13-4,
> > procps < 3.2.5-6.3, oprofile
> > < 0.9.1-2
> >
> > #
> > # Then a series of requirements that are distribution specific, either
> > # because we add patches for something, or the older versions have
> > # problems with the newer kernel or lack certain things that make
> > # integration in the distro harder than needed.
> > #
> > %define package_conflicts initscripts < 7.23, udev < 063-6, iptables <
> > 1.3.2-1, ipw2200-firmware < 2.4, selinux-policy-targeted < 1.25.3-14
> >
> > #
> > # The ld.so.conf.d file we install uses syntax older ldconfig's don't
> > grok.
> > #
> > %define xen_conflicts glibc < 2.3.5-1, xen < 3.0.1
> >
> > [...]
> >
> > On 1/19/07, Daniel P. Berrange <berrange@xxxxxxxxxx> wrote:
> > > On Fri, Jan 19, 2007 at 07:39:52PM +0100, AndreGround wrote:
> > > > Perfect. Thanks everybody.
> > > > I'll try to modify the spec in the SRPM of the kernel.
> > > >
> > > > So (taken from the same set):
> > > > - Modified Kernel with PAE disabled (obtained by rebuilding the
> > Fedora's
> > > > SRPM)
> > > > - Original hypervisor RPM (the one provided by Fedora, not
> modified)
> > >
> > > In Fedora packaging, the kernel-xen RPM also contains the
> hypervisor.
> > > So you just need to re-build the single RPM - make sure you turn off
> > > PAE for the kernel & hv bits of the build process though.
> > >
> > > Dan.
> > > --
> > > |=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392
> > 2496 -=|
> > > |=-           Perl modules: http://search.cpan.org/~danberr/
> > -=|
> > > |=-               Projects: http://freshmeat.net/~danielpb/
> > -=|
> > > |=-  GnuPG: 7D3B9505   F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B
> > 9505  -=|
> > >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> >
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