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

[AndreGround <andreground@xxxxxxxxx>]

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  -=|
> >
>
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