Re: [Qemu-devel] [PATCH] machine: Add kvm-type property

[Marcel Apfelbaum <marcel.a@redhat.com>]

On Fri, 2014-05-30 at 17:41 -0300, Eduardo Habkost wrote:
> The kvm-type machine option was left out when MachineState was
> introduced, preventing the kvm-type option from being used. Add the
> missing property.
Very interesting how did I miss that.
Thanks!
Marcel

> 
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> Cc: Andreas Färber <afaerber@suse.de>
> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> Cc: Alexander Graf <agraf@suse.de>
> Cc: Marcel Apfelbaum <marcel.a@redhat.com>
> ---
> Tested in a x86 machine only. Help would be welcome to test it on a PPC
> machine using -machine spapr and KVM.
> 
> Before this patch:
> 
>     $ qemu-system-x86_64 -machine pc,kvm-type=hv,accel=kvm
>     qemu-system-x86_64: Property '.kvm-type' not found
> 
> (This means the option won't work even for sPAPR machines.)
> 
> After applying this patch:
> 
>     $ qemu-system-x86_64 -machine pc,kvm-type=hv,accel=kvm
>     Invalid argument kvm-type=hv
> 
> (This means the x86 KVM init code is seeing (and rejecting) the option,
> and the sPAPR code can use it.)
> 
> Note that qemu-system-x86_64 will segfault with the above command-line
> unless an additional fix (submitted today) is applied (kvm: Ensure
> negative return value on kvm_init() error handling path).
> ---
>  hw/core/machine.c   | 17 +++++++++++++++++
>  include/hw/boards.h |  1 +
>  2 files changed, 18 insertions(+)
> 
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index cbba679..ed47b3a 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -235,6 +235,21 @@ static void machine_set_firmware(Object *obj, const char *value, Error **errp)
>      ms->firmware = g_strdup(value);
>  }
>  
> +static char *machine_get_kvm_type(Object *obj, Error **errp)
> +{
> +    MachineState *ms = MACHINE(obj);
> +
> +    return g_strdup(ms->kvm_type);
> +}
> +
> +static void machine_set_kvm_type(Object *obj, const char *value, Error **errp)
> +{
> +    MachineState *ms = MACHINE(obj);
> +
> +    g_free(ms->kvm_type);
> +    ms->kvm_type = g_strdup(value);
> +}
> +
>  static void machine_initfn(Object *obj)
>  {
>      object_property_add_str(obj, "accel",
> @@ -274,6 +289,8 @@ static void machine_initfn(Object *obj)
>      object_property_add_bool(obj, "usb", machine_get_usb, machine_set_usb, NULL);
>      object_property_add_str(obj, "firmware",
>                              machine_get_firmware, machine_set_firmware, NULL);
> +    object_property_add_str(obj, "kvm-type",
> +                            machine_get_kvm_type, machine_set_kvm_type, NULL);
>  }
>  
>  static void machine_finalize(Object *obj)
> diff --git a/include/hw/boards.h b/include/hw/boards.h
> index 2d2e2be..44956d6 100644
> --- a/include/hw/boards.h
> +++ b/include/hw/boards.h
> @@ -111,6 +111,7 @@ struct MachineState {
>      bool mem_merge;
>      bool usb;
>      char *firmware;
> +    char *kvm_type;
>  
>      ram_addr_t ram_size;
>      const char *boot_order;