Am 15.06.2012 05:06, schrieb Li Zhang:
>
>
> On Thu, Jun 14, 2012 at 10:27 PM, Andreas Färber <afaer...@suse.de
> <mailto:afaer...@suse.de>> wrote:
>
> Am 14.06.2012 07:17, schrieb zhlci...@gmail.com
> <mailto:zhlci...@gmail.com>:
> > From: Li Zhang <zhlci...@linux.vnet.ibm.com
> <mailto:zhlci...@linux.vnet.ibm.com>>
> >
> > For pseries machine, it needs to enable usb
> > to add kbd or usb mouse. -usb option won't
> > be used in the future, and machine options
> > is a better way to enable usb.
> >
> > So this patch is to add usb option to machine
> > options (-machine type=psereis,usb=on/off)
> > to enable/disable usb controller.
> >
> > In this patch, usb_opt is an global option
> > which can be checked by machines. For example,
> > on pseries, it will check if usb_opt is on, if
> > it is on, it will create one usb ohci controller.
> > As the following:
> > if (usb_opts && strcmp(usb_opts, "on") == 0)
> > pci_create_simple(bus, -1, "pci-ohci");
> >
> > In this patch, usb is on by default.
> > So, for -nodefault, usb should be set off in the
> > command line as the following:
> > -machine type=pseries,usb=off.
> >
> > Signed-off-by: Li Zhang <zhlci...@linux.vnet.ibm.com
> <mailto:zhlci...@linux.vnet.ibm.com>>
> > reviewed-by: Anthony Liguori <aligu...@us.ibm.com
> <mailto:aligu...@us.ibm.com>>
> > reviewed-by: Benjamin Herrenschmidt <b...@au1.ibm.com
> <mailto:b...@au1.ibm.com>>
> > ---
> > qemu-config.c | 4 ++++
> > sysemu.h | 1 +
> > vl.c | 12 ++++++++++++
> > 3 files changed, 17 insertions(+)
> >
> > diff --git a/qemu-config.c b/qemu-config.c
> > index bb3bff4..258712a 100644
> > --- a/qemu-config.c
> > +++ b/qemu-config.c
> > @@ -583,6 +583,10 @@ static QemuOptsList qemu_machine_opts = {
> > .name = "dtb",
> > .type = QEMU_OPT_STRING,
> > .help = "Linux kernel device tree file",
> > + }, {
> > + .name = "usb",
> > + .type = QEMU_OPT_BOOL,
> > + .help = "Set on/off to enable/disable usb",
> > },
> > { /* End of list */ }
> > },
> > diff --git a/sysemu.h b/sysemu.h
> > index bc2c788..c5ea10d 100644
> > --- a/sysemu.h
> > +++ b/sysemu.h
> > @@ -13,6 +13,7 @@
> > /* vl.c */
> >
> > extern const char *bios_name;
> > +extern const char *usb_opt;
> >
> > extern const char *qemu_name;
> > extern uint8_t qemu_uuid[];
> > diff --git a/vl.c b/vl.c
> > index 204d85b..10f8e4c 100644
> > --- a/vl.c
> > +++ b/vl.c
> > @@ -171,6 +171,7 @@ int main(int argc, char **argv)
> >
> > static const char *data_dir;
> > const char *bios_name = NULL;
> > +const char *usb_opt = NULL;
> > enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
> > DisplayType display_type = DT_DEFAULT;
> > int display_remote = 0;
[...]
> The point of using machine options is so that you can use the QemuOpts
> infrastructure to inquire this value, not to save more global state.
>
> OK, I think it still needs one global value because other machines need
> to check whether usb is enabled.
>
>
> Especially not a string when all you want is a boolean value.
>
> From the qemu, QEMU_OPT_BOOL type still use a string
> "on/off" to enable/disable usb.
> Maybe it's better to convert it to boolean value.
>
> Further, in this patch it's only being assigned, not used anywhere.
>
> In vl.c, it seems that it is not used.
> I have been thinking to use it in spapr.c.
>
> if (usb_opts && strcmp(usb_opts, "on") == 0)
> pci_create_simple(bus, -1, "pci-ohci");
>
> But I want to see whether this way is accepted.
> If it is ok, I will add this option to spapr.c.
First, please don't reply with HTML mails, it breaks the quoting as you
can see.
You don't seem to be getting what I'm saying: As discussed in great
lengths for how to access a passed-in device tree for ARM, the code
checking this option (i.e., in spapr.c) is expected to call
qemu_opt_get() itself, instead of saving its value globally in vl.c. For
example:
machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
usb_opt = qemu_opt_get(machine_opts, "usb");
if (strcmp(usb_opt, "off") != 0) {
// set up OHCI
}
with appropriate NULL checks left as exercise for the reader.
So you should combine the definition of the option in qemu-config.c
(which looks okay) with its actual use in hw/spapr.c in one patch.
Once introduced, hw/ppc_newworld.c should be updated to check the new
option as well, but that can be a follow-up patch.
Regards,
Andreas
> > @@ -758,6 +759,15 @@ static int bt_parse(const char *opt)
> > return 1;
> > }
> >
> > +static int default_enable_usb(QemuOpts *opts)
> > +{
> > + if (NULL == qemu_opt_get(opts, "usb")) {
> > + qemu_opt_set(opts, "usb", "on");
> > + }
> > +
> > + return 0;
> > +}
> > +
> > /***********************************************************/
> > /* QEMU Block devices */
> >
> > @@ -3356,6 +3366,8 @@ int main(int argc, char **argv, char **envp)
> > kernel_filename = qemu_opt_get(machine_opts, "kernel");
> > initrd_filename = qemu_opt_get(machine_opts, "initrd");
> > kernel_cmdline = qemu_opt_get(machine_opts, "append");
> > + default_enable_usb(machine_opts);
> > + usb_opt = qemu_opt_get(machine_opts, "usb");
> > } else {
> > kernel_filename = initrd_filename = kernel_cmdline = NULL;
> > }
--
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