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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-07-10 at 15:04 +0100, Stefano Stabellini wrote:
> 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. 

Oh good, I was misremembering which way round it was.

> > 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.

When built as an ARM binary with x86 as the target architecture what
does it consider to be the NATIVE protocol?

You didn't mention the ARM protocol, hopefully just an oversight?

Ian


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