linux-kernel - Re: [PATCH v3 01/16] Introduce probe mode for machine type none

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Message-ID: <54F46C41.3000201@suse.de>
Date:	Mon, 02 Mar 2015 14:57:21 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	qemu-devel@...gnu.org,
	"Edgar E. Iglesias" <edgar.iglesias@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>
CC:	Michael Mueller <mimu@...ux.vnet.ibm.com>, kvm@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>, Alexander Graf <agraf@...e.de>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Richard Henderson <rth@...ddle.net>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Alistair Francis <alistair.francis@...inx.com>
Subject: Re: [PATCH v3 01/16] Introduce probe mode for machine type none

Am 02.03.2015 um 13:43 schrieb Michael Mueller:
> QEMU now switches into "probe mode" when the selected machine is "none" and no
> specific accelerator(s) has been requested (i.e.: "-machine none").
> 
> In probe mode a by "<ARCH>_CONFIG" defines predefined list of accelerators run
> their init() methods.
> 
> Signed-off-by: Michael Mueller <mimu@...ux.vnet.ibm.com>
> ---
>  accel.c              | 31 +++++++++++++++++++++++++------
>  include/hw/boards.h  |  1 +
>  include/sysemu/kvm.h | 10 ++++++++++
>  kvm-all.c            |  3 +++
>  4 files changed, 39 insertions(+), 6 deletions(-)

Edgar/Peter, isn't Xilinx using -machine none in TCG mode?

> @@ -78,20 +83,30 @@ static int accel_init_machine(AccelClass *acc, MachineState *ms)
>  
>  int configure_accelerator(MachineState *ms)
>  {
> -    const char *p;
> +    const char *p, *name;
>      char buf[10];
>      int ret;
>      bool accel_initialised = false;
>      bool init_failed = false;
>      AccelClass *acc = NULL;
> +    ObjectClass *oc;
> +    bool probe_mode = false;
>  
>      p = qemu_opt_get(qemu_get_machine_opts(), "accel");
>      if (p == NULL) {
> -        /* Use the default "accelerator", tcg */
> -        p = "tcg";
> +        oc = (ObjectClass *) MACHINE_GET_CLASS(current_machine);
> +        name = object_class_get_name(oc);
> +        probe_mode = !strcmp(name, "none" TYPE_MACHINE_SUFFIX);
> +        if (probe_mode) {
> +            /* Use these accelerators in probe mode, tcg should be last */
> +            p = probe_mode_accels;
> +        } else {
> +            /* Use the default "accelerator", tcg */
> +            p = "tcg";
> +        }
>      }

Can't we instead use an explicit ,accel=probe or ,accel=auto?
That would then obsolete the next patch.

Regards,
Andreas

>  
> -    while (!accel_initialised && *p != '\0') {
> +    while ((probe_mode || !accel_initialised) && *p != '\0') {
>          if (*p == ':') {
>              p++;
>          }

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