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

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Stefano Stabellini [mailto:stefano.stabellini@xxxxxxxxxxxxx]
> Sent: 25 June 2013 13:02
> To: Paul Durrant
> Cc: qemu-devel@xxxxxxxxxx; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [PATCH 1/2] Allow use of pc machine type
> (accel=xen) for Xen HVM domains.
> 
> On Tue, 18 Jun 2013, Paul Durrant wrote:
> > 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..f96e0c2 100644
> > --- a/hw/i386/pc_piix.c
> > +++ b/hw/i386/pc_piix.c
> > @@ -91,6 +91,11 @@ static void pc_init1(MemoryRegion
> *system_memory,
> >      DeviceState *icc_bridge;
> >      FWCfgState *fw_cfg = NULL;
> >
> > +    if (xen_enabled() && xen_hvm_init() != 0) {
> > +        fprintf(stderr, "xen hardware virtual machine initialisation 
> > failed\n");
> > +        exit(1);
> > +    }
> > +
> >      icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
> >      object_property_add_child(qdev_get_machine(), "icc-bridge",
> >                                OBJECT(icc_bridge), NULL);
> 
> I was about to submit a pull request with this patch, but unfortunately
> it breaks non-xen compilations:
> 
> hw/i386/pc_piix.o: In function `pc_init1':
> /local/scratch/sstabellini/qemu/hw/i386/pc_piix.c:94: undefined reference
> to `xen_hvm_init'
> 
> you need to add the function to xen-stub.c:
> 
> diff --git a/xen-stub.c b/xen-stub.c
> index 6f0516a..47c8e73 100644
> --- a/xen-stub.c
> +++ b/xen-stub.c
> @@ -63,3 +63,8 @@ void qmp_xen_set_global_dirty_log(bool enable, Error
> **errp)
>  void xen_modified_memory(ram_addr_t start, ram_addr_t length)
>  {
>  }
> +
> +int xen_hvm_init(void)
> +{
> +    return 0;
> +}
> 
> I'll include this change in the pull request

Ok. Thanks for the fix-up.

  Paul

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