Re: [Xen-devel] [PATCH] enable QEMU for ARM builds

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Thu, 10 Jul 2014, Ian Campbell wrote:
> On Thu, 2014-07-10 at 12:18 +0100, Stefano Stabellini wrote:
> > Build qemu-xen on ARM and ARM64: it is used to provide the PV backends,
> > disk and framebuffer in particular.
> > 
> > Ideally we would also modify the configure options to only build what is
> > necessary: a machine just for PV backends. However that is a work in
> > progress and not yet available in QEMU (see
> > http://marc.info/?l=qemu-devel&m=139082425718379&w=2). So we just build
> > the usual i386 target, even though no i386 emulation is going to be done
> > by qemu-xen on ARM.
> 
> As I mentioned IRL we need to confirm that this doesn't end up exposing
> a protocol property in the xenstore backend dir of
> XEN_IO_PROTO_ABI_X86_* instead of XEN_IO_PROTO_ABI_ARM.

QEMU doesn't write the protocol to xenstore. In fact the protocol is
written to xenstore by the frontend so this shouldn't be a problem. 


> Likewise we need to be sure that the code actually implements the ARM
> protocol, not one of the x86 ones.

Sure. No matter the QEMU target architecture,  qdisk and xenfb implement
NATIVE as well as x86 protocols.



> Ian.
> > 
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > 
> > diff --git a/tools/configure b/tools/configure
> > index 20f1aa9..b39012b 100755
> > --- a/tools/configure
> > +++ b/tools/configure
> > @@ -3869,6 +3869,8 @@ else
> >      case "$host_cpu" in
> >          i[3456]86|x86_64)
> >             qemu_xen=y;;
> > +        arm*|aarch64)
> > +           qemu_xen=y;;
> >          *) qemu_xen=n;;
> >      esac
> >  
> > diff --git a/tools/configure.ac b/tools/configure.ac
> > index 6d70f04..d1c8e5e 100644
> > --- a/tools/configure.ac
> > +++ b/tools/configure.ac
> > @@ -126,6 +126,8 @@ AC_ARG_WITH([system-qemu],
> >      case "$host_cpu" in
> >          i[[3456]]86|x86_64)
> >             qemu_xen=y;;
> > +        arm*|aarch64)
> > +           qemu_xen=y;;
> >          *) qemu_xen=n;;
> >      esac
> >  ])
> > 
> 
> 

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