[Users] about live snapshot and qemu-kvm
Douglas Schilling Landgraf
dougsland at redhat.com
Thu Feb 13 14:42:12 EST 2014
On 01/01/2014 06:24 AM, Gianluca Cecchi wrote:
> On Wed, Jan 1, 2014 at 4:38 AM, R P Herrold wrote:
>
>>
>> Out of curiousity, _what_ build environment 'flags' do you
>> all, participating in this thread, refer to? -- the thread
>> does not enumerate them explicitly, and one cannot expect to
>> hit by 'indirect fire', a target not exposed
>>
>> With best regards, this New Year's eve
>
> I'm far from being a programmer, but as I went to compare build
> environments, between
> qemu-kvm-rhev-0.12.1.2-2.415.el6_5.3.src.rpm
> and
> qemu-kvm-0.12.1.2-2.415.el6_5.3.src.rpm
> in related spec file I see
> [g.cecchi at tekkaman SPECS]$ diff qemu-kvm.spec.upstream qemu-kvm.spec.rhev
> 3c3
> < %define rhev 0
> ---
>> %define rhev 1
> 12928a12929
>>>>>>>>> rhel-6.5
>
> and apart other probably not trivial implications, such as guest agent
> part, I see that the "configure" command takes one extra argument in
> base RH EL 6.5, that is
>
> --disable-rhev-features
>
> The only patch file containing this keyword is
>
> kvm-Block-streaming-disable-for-RHEL.patch
>
> and inside it there are these lines that impacts configure options and
> related built qemu-kvm:
>
> --- a/configure
> +++ b/configure
> @@ -286,6 +286,7 @@ spice=""
> smartcard=""
> smartcard_nss=""
> live_snapshots="yes"
> +block_stream="yes"
> usb_redir=""
>
> # OS specific
> @@ -686,10 +687,22 @@ for opt do
> ;;
> --enable-live-snapshots) live_snapshots="yes"
> ;;
> + --disable-block-stream) block_stream="no"
> + ;;
> + --enable-block-stream) block_stream="yes"
> + ;;
> --disable-usb-redir) usb_redir="no"
> ;;
> --enable-usb-redir) usb_redir="yes"
> ;;
> + --disable-rhev-features)
> + live_snapshots="no";
> + block_stream="no";
> + ;;
> + --enable-rhev-features)
> + live_snapshots="yes";
> + block_stream="yes";
> + ;;
> *) echo "ERROR: unknown option $opt"; show_help="yes"
> ;;
> esac
> @@ -863,8 +876,12 @@ echo " --disable-smartcard-nss disable
> smartcard nss support"
> echo " --enable-smartcard-nss enable smartcard nss support"
> echo " --disable-live-snapshots disable live block device snapshot support"
> echo " --enable-live-snapshots enable live block device snapshot support"
> +echo " --disable-block-stream disable block streaming support"
> +echo " --enable-block-stream enable block streaming support"
> echo " --disable-usb-redir disable usb network redirection support"
> echo " --enable-usb-redir enable usb network redirection support"
> +echo " --disable-rhev-features disable RHEV-only features"
> +echo " --enable-rhev-features enable RHEV-only features"
> echo ""
> echo "NOTE: The object files are built at the place where configure
> is launched"
> exit 1
> @@ -2271,6 +2288,7 @@ echo "Trace backend $trace_backend"
> echo "spice support $spice"
> echo "nss used $smartcard_nss"
> echo "Live snapshots $live_snapshots"
> +echo "Block streaming $block_stream"
> echo "xfsctl support $xfs"
> echo "usb net redir $usb_redir"
>
> @@ -2526,6 +2544,10 @@ if test "$live_snapshots" = "yes" ; then
> echo "CONFIG_LIVE_SNAPSHOTS=y" >> $config_host_mak
> fi
>
> +if test "$block_stream" = "yes" ; then
> + echo "CONFIG_BLOCK_STREAM=y" >> $config_host_mak
> +fi
> +
> if test "$usb_redir" = "yes" ; then
> echo "CONFIG_USB_REDIR=y" >> $config_host_mak
> fi
>
> I don't think the rhev argument has instead implications in upstream
> source qemu-kvm-0.12.1.2.tar.gz
> So I think that if you want to dig more and if you have more
> competences, you have to see the full spec file and the full patch
> above.
>
> Files downloaded here:
>
> upstream
> http://ftp.redhat.com/redhat/linux/enterprise/6Server/en/os/SRPMS/qemu-kvm-0.12.1.2-2.415.el6_5.3.src.rpm
>
> rhev
> http://ftp.redhat.com/redhat/linux/enterprise/6Server/en/RHEV/SRPMS/qemu-kvm-rhev-0.12.1.2-2.415.el6_5.3.src.rpm
>
Just for the record, we have setup a jenkins job to rebuild qemu-kvm for
el6 until we get it officially from centos:
http://jenkins.ovirt.org/view/Packaging/job/qemu-kvm-rhev_create_rpms_el6/
--
Cheers
Douglas
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