[ovirt-devel] [CentOS-virt] qemu-kvm SLIC acpitable workaround of Windows bug

[Sandro Bonazzola]

On Thu, Jul 30, 2015 at 9:04 PM, Gena Makhomed <gmm at csdoc.com> wrote:

> On 30.07.2015 10:49, Nux! wrote:
>
> Then you should definitely submit a bug with redhat about this, seems like
>> a serious one.
>>
>
> Ok, done:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1248758
>
> P.S.
>
> As I can see - bugzilla.redhat.com for oVirt Product
> does not contain qemu-kvm-ev Component at all - looks
> like this is yet another bug - in the bugzilla settings.
>

Adding oVirt devel mailing list.


>
> But I can't find how to report this bugzilla misconfiguration,
> so I just report this oVirt bugreport as bugreport for package
> qemu-kvm-rhev from Red Hat Enterprise Virtualization Manager Product.
>
> I hope this help.
>

Have you checked 3.5.4 RC or CentOS Virt SIG[2] to see if the bug has been
fixed in latest qemu-kvm-ev ?

[1] http://resources.ovirt.org/pub/ovirt-3.5-pre/
[2] http://cbs.centos.org/repos/virt7-kvm-common-testing/x86_64/os/


>
> ----- Original Message -----
>>
>
> On 29.07.2015 21:34, Nux! wrote:
>>>
>>> Yes, you can.
>>>> In fact you can use the binaries from the ovirt repo itself, no need to
>>>> rebuild.
>>>>
>>>
>>> Thank you!
>>>
>>> In fact - I can't use raw binaries from the ovirt repo itself,
>>> because these qemu-kvm binaries contains one bug,
>>> which is already fixed in Debian:
>>>
>>> If you want to migrate Windows from hardware node
>>> to VM using CentOS 7.1 on hardware node and libvirt xml config:
>>>
>>> <domain type='kvm' xmlns:qemu='
>>> http://libvirt.org/schemas/domain/qemu/1.0'>
>>> .....
>>>    <qemu:commandline>
>>>      <qemu:arg value='-acpitable'/>
>>>      <qemu:arg value='file=/sys/firmware/acpi/tables/SLIC'/>
>>>    </qemu:commandline>
>>> </domain>
>>>
>>> Winodws not working correctly in this case, because Windows requires,
>>> what oem_id and oem_table_id from SLIC must be also placed
>>> into oem_id and oem_table_id of RSDT.
>>>
>>> Debian version of qemu-kvm contains workaround for this windows bug,
>>> and using Debian - Windows VM will works fine. But CentOS packages
>>> does not contain such workaround, so qemu-kvm-ev now must be patched
>>> manually with each new release.
>>>
>>> Patch already was created by Michael Tokarev in 2014:
>>> this is file mjt-set-oem-in-rsdt-like-slic.diff
>>> from https://packages.debian.org/jessie/qemu-kvm
>>>
>>> This patch cleanly applies also to qemu-kvm-ev-2.1.2-23.el7_1.3.1
>>>
>>> See mjt-set-oem-in-rsdt-like-slic.diff
>>> and qemu-kvm.spec.patch in attach for details.
>>>
>>> After executing rpmbuild -ba qemu-kvm.spec
>>> you can place new qemu-kvm binaries into
>>> /srv/download/centos/7/privat/x86_64/Packages
>>> create local repo and use it for upgrading rpm packages,
>>> for example, see privat.repo and privat-createrepo-7-x86_64
>>> in attach.
>>>
>>> ==============================================================
>>>
>>> Better if this workaround of Windows bug will be included
>>> into RHEL/CentOS ovirt repo binaries, and this will allow
>>> to anybody easy migrate Windows from hardware nodes
>>> to VMs and easy run CentOS/RHEL at hardware nodes.
>>>
>>>
>>> P.S.
>>>       After patching qemu-kvm - option
>>>       acpitable works without any bugs:
>>>
>>>    # man qemu-kvm
>>>
>>>      -acpitable [sig=str][...]
>>>          If a SLIC table is supplied to qemu,
>>>          then the oem_id from the SLIC table
>>>          will be copied into the RSDT table
>>>          (this is a Debian addition).
>>>
>>> ----- Original Message -----
>>>>
>>>
>>> Is it possible to use binary packages build from
>>>>>
>>>>> http://resources.ovirt.org/pub/ovirt-3.5/rpm/el7/SRPMS/qemu-kvm-ev-2.1.2-23.el7_1.3.1.src.rpm
>>>>> with plain CentOS 7.1 and use all other packages from CentOS
>>>>> (libvirt, virt-manager, etc)
>>>>>
>>>>> Is it have reasons, if I not use live migrations and qcow2 snapshots?
>>>>> (instead use zfs, zvols and zfs snapshots for VM disks online backups)
>>>>>
>>>>> Is using qemu-kvm-ev with CentOS 7.1 have any disadvantages?
>>>>>
>>>>
> --
> Best regards,
>  Gena
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt
>



-- 
Sandro Bonazzola
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