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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

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.


> I'll add a comment.


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