Re: [Xen-devel] [Qemu-devel] [PATCH 1/2] Allow use of pc machine type (accel=xen) for Xen HVM domains.

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Andreas Färber [mailto:afaerber@xxxxxxx]
> Sent: 18 June 2013 11:29
> To: Paul Durrant
> Cc: qemu-devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxx; Paolo Bonzini
> Subject: Re: [Qemu-devel] [PATCH 1/2] Allow use of pc machine type
> (accel=xen) for Xen HVM domains.
> 
> Am 18.06.2013 11:59, schrieb Paul Durrant:
> > Xen HVM domains normally spawn QEMU with a dedicated xenfv machine
> type. The
> > initialization code for this machine type can easily be pulled into the
> > generic pc initialization code and guarded with a test for whether the xen
> > accelerator options is specified, which is more consistent with the way
> > other accelerators are used.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
> > ---
> >  hw/i386/pc_piix.c |    8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> > index d618570..7bbb59a 100644
> > --- a/hw/i386/pc_piix.c
> > +++ b/hw/i386/pc_piix.c
> > @@ -1,3 +1,4 @@
> > +
> >  /*
> >   * QEMU PC System Emulator
> >   *
> 
> Unrelated whitespace change, please drop this hunk.
> 

Ok.

> > @@ -91,6 +92,10 @@ static void pc_init1(MemoryRegion
> *system_memory,
> >      DeviceState *icc_bridge;
> >      FWCfgState *fw_cfg = NULL;
> >
> > +    if (xen_enabled() && xen_hvm_init() != 0) {
> > +        hw_error("xen hardware virtual machine initialisation failed");
> 
> I see this is just a code movement, but maybe consider replacing that
> with an fprintf()+exit(1)? Xen does not have any CPUs AFAIU and they
> wouldn't be initialized at that point anyway, so hw_error() is not much
> more than an fprintf()+abort().
> 

If that's preferred I can do that, but it makes it less apparent that this 
patch is just code movement.

  Paul

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