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

[Andreas Färber <afaerber@xxxxxxx>]

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.

> @@ -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().

Regards,
Andreas

> +    }
> +
>      icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
>      object_property_add_child(qdev_get_machine(), "icc-bridge",
>                                OBJECT(icc_bridge), NULL);
> @@ -320,9 +325,6 @@ static void pc_init_isa(QEMUMachineInitArgs *args)
>  #ifdef CONFIG_XEN
>  static void pc_xen_hvm_init(QEMUMachineInitArgs *args)
>  {
> -    if (xen_hvm_init() != 0) {
> -        hw_error("xen hardware virtual machine initialisation failed");
> -    }
>      pc_init_pci(args);
>  }
>  #endif

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