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xen-users
Re: Re: [Xen-users] No DomU boot after upgrade to xen 4.0
On Sun, 2010-04-25 at 21:39 +0200, Ralf Hornik Mailings wrote:
> Hi Christian,
>
> Christian Kujau schrieb:
> > Has the Dom0 kernel CONFIG_TUN enabled? If so, is TUN/TAP working?
> >
> No it isn't. How do I enable it? The default "make world" doesn't seem
> to do that
>
> However:
>
> make linux-2.6-xen-config CONFIGMODE=menuconfig
>
> as in 2.6.18 does not work as its downloading the 2.6.18 kernel then. Is
> there any documentation how to conmpile a custom kernel with xen 4 and
> 2.6.31?
>
> For VTd I found out the following:
>
> xm dmesg:
>
> (XEN) [VT-D]dmar.c:679: Host address width 36
> (XEN) [VT-D]dmar.c:694: found ACPI_DMAR_DRHD:
> (XEN) [VT-D]dmar.c:398: dmaru->address = feb00000
> (XEN) [VT-D]dmar.c:334: endpoint: 0:1b.0
> (XEN) [VT-D]dmar.c:694: found ACPI_DMAR_DRHD:
> (XEN) [VT-D]dmar.c:398: dmaru->address = feb01000
> (XEN) [VT-D]dmar.c:334: endpoint: 0:2.0
> (XEN) [VT-D]dmar.c:334: endpoint: 0:2.1
> (XEN) [VT-D]dmar.c:447: Non-existent device (0:2.1) is reported in
> this DRHD's scope!
> (XEN) [VT-D]dmar.c:469: The DRHD is invalid due to there are devices
> under its scope are not PCI discoverable! Pls try option iommu=force or
> iommu=workaround_bios_bug if you really want VT-d
> (XEN) Failed to parse ACPI DMAR. Disabling VT-d.
>
> When I set iommu=force then vtd will be enabled but what should I do to
> solve this better?
> Thank you and best Regards
>
> Ralf
You cand find nice "howto" for 2.6.31 kernel compilation (also
with .config files) in the second half of this page -
http://wiki.xensource.com/xenwiki/XenParavirtOps.
I would still do "make menuconfig" with these provided .config files,
IIRC there are some debug options turned on, which can negatively impact
performance (which could matter on production servers).
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git
linux-2.6-xen
$ cd linux-2.6-xen
$ git reset --hard
$ git checkout -b xen/stable-2.6.31.x origin/xen/stable-2.6.31.x
$ git pull
$ git log | less
cd linux-2.6-xen
make clean
cp -a .config .config-old
wget -O .config
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64
make oldconfig
make menuconfig (if you need to change something)
make bzImage
make modules
make modules_install
# in the following lines replace "version" with the actual kernel
version you're compiling.
cp -a .config /boot/config-version
cp -a System.map /boot/System.map-version
cp -a arch/x86/boot/bzImage /boot/vmlinuz-version
# And then generate initrd/initramfs image for your dom0 kernel, example
for Fedora/RHEL/CentOS:
mkinitrd -f /boot/initrd-version.img version
Regards
Matej
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