Re: [Xen-devel] [PATCH raisin 4/4] Update to 4.7, update qemu and qemu_traditional recipes

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 14/06/16 11:31, Stefano Stabellini wrote:
> On Tue, 14 Jun 2016, George Dunlap wrote:
>> On 14/06/16 11:08, Stefano Stabellini wrote:
>>> On Tue, 14 Jun 2016, George Dunlap wrote:
>>>> On 14/06/16 10:46, Stefano Stabellini wrote:
>>>>> On Mon, 13 Jun 2016, George Dunlap wrote:
>>>>>> Add a 4.7 config file, make it the default.
>>>>>>
>>>>>> Also update the qemu and qemu_traditional recipies after Ian Cambell's
>>>>>> work to split off separate libraries.
>>>>>>
>>>>>> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
>>>>>> ---
>>>>>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>>>>>> ---
>>>>>>  components/qemu             | 21 +++++++++++++--------
>>>>>>  components/qemu_traditional |  2 +-
>>>>>>  configs/config-4.7          |  8 ++++++++
>>>>>>  defconfig                   |  2 +-
>>>>>>  4 files changed, 23 insertions(+), 10 deletions(-)
>>>>>>
>>>>>> diff --git a/components/qemu b/components/qemu
>>>>>> index e0d92a5..8624b50 100644
>>>>>> --- a/components/qemu
>>>>>> +++ b/components/qemu
>>>>>> @@ -23,15 +23,20 @@ function qemu_build() {
>>>>>>      cd "$BASEDIR"
>>>>>>      git-checkout $QEMU_URL $QEMU_REVISION qemu-dir
>>>>>>      cd qemu-dir
>>>>>> -    ./configure --enable-xen --target-list=i386-softmmu 
>>>>>> --prefix=$PREFIX \
>>>>>> -        --extra-cflags="-I$INST_DIR/$PREFIX/include" \
>>>>>> -        --extra-ldflags="-L$INST_DIR/$PREFIX/lib 
>>>>>> -Wl,-rpath-link=$INST_DIR/$PREFIX/lib \
>>>>>> +
>>>>>> +    ./configure --enable-xen --target-list=i386-softmmu \
>>>>>> +                --prefix=$PREFIX \
>>>>>> +                --extra-cflags="-DXC_WANT_COMPAT_EVTCHN_API=1 \
>>>>>> +                -DXC_WANT_COMPAT_GNTTAB_API=1 \
>>>>>> +                -DXC_WANT_COMPAT_MAP_FOREIGN_API=1 \
>>>>>> +                -I$INST_DIR/$PREFIX/include" \
>>>>>> +                --extra-ldflags="-L$INST_DIR/$PREFIX/lib 
>>>>>> -Wl,-rpath-link=$INST_DIR/$PREFIX/lib \
>>>>>>                           -L$INST_DIR/$PREFIX/lib64 
>>>>>> -Wl,-rpath-link=$INST_DIR/$PREFIX/lib64" \
>>>>>> -        --disable-kvm \
>>>>>> -        --disable-docs \
>>>>>> -        --bindir=$PREFIX/lib/xen/bin \
>>>>>> -        --datadir=$PREFIX/share/qemu-xen \
>>>>>> -        --disable-guest-agent
>>>>>> +                --bindir=$PREFIX/lib/xen/bin \
>>>>>> +                --datadir=$PREFIX/share/qemu-xen \
>>>>>> +                --disable-kvm \
>>>>>> +                --disable-docs \
>>>>>> +                --disable-guest-agent
>>>>>
>>>>> This is adding XC_WANT_COMPAT_EVTCHN_API=1, etc, unconditionally. If we
>>>>> make this change, will raisin still be able to buil an older qemu
>>>>> against an older xen?
>>>>
>>>> I've tested this with XEN_RELEASE set to 4.5 and 4.6, and it builds just
>>>> fine.  The #define is just ignored, since neither Xen nor qemu in the
>>>> 4.5 and 4.6 branches know anything about it.
>>>>
>>>> If part of our goal is to be a repository of the canonical way to build
>>>> things, though, perhaps it would be better to have the extra flags be
>>>> conditional on the value of XEN_RELEASE.
>>>
>>> If we are sure that it's ignored than it might be benign. Maybe we
>>> should just add an in-code comment to explain why we added it though.
>>
>> Well really, I think that the detection should be put into the qemu
>> configure scripts -- i.e., it should detect that there's the new API and
>> add the appropriate #defines itself.  But that's the sort of change I
>> don't think there will be a lot of enthusiasm for. :-)
> 
> Actually there is already code in QEMU configure script for the
> detection. In fact I was wondering if explicitly passing XC_WANT_* is
> actually necessary. I don't think it is from QEMU POV.

That code might be in qemu-upstream, but it's not in the qemu-xen trees;
if you revert this bit of the patch and try to build with raisin it will
fail.  That's why I even bothered to add these in in the first place;
and why IanC added these runes to tools/Makefile.

Anthony, can you comment more authoritatively here on what's going on?
Would it be possible for 4.7.1 to backport the configure auto-detection
stuff?

 -George

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