Re: [Qemu-devel] [PATCH] usb/vmstate: add parent dev path

["Andreas Färber" <afaerber@suse.de>]

Am 22.03.2012 13:07, schrieb Gerd Hoffmann:
> ... to make vmstate id string truely unique with multiple host
> controllers, i.e. move from "1/usb-ptr" to "0000:00:01.3/1/usb-ptr"
> (usb tabled connected to piix3 uhci).
> 
> This obviously breaks migration.  To handle this the usb bus
> property "full-path" is added.  When setting this to false old
> behavior is maintained.  This way current qemu will be compatible
> with old versions when started using '-M pc-$oldversion'.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/pc_piix.c |   28 ++++++++++++++++++++++++++++
>  hw/usb.h     |    5 +++++
>  hw/usb/bus.c |   18 +++++++++++++++++-
>  3 files changed, 50 insertions(+), 1 deletions(-)
> 
> diff --git a/hw/pc_piix.c b/hw/pc_piix.c
> index 3f99f9a..8cb7d5f 100644
> --- a/hw/pc_piix.c
> +++ b/hw/pc_piix.c
> @@ -386,6 +386,10 @@ static QEMUMachine pc_machine_v1_0 = {
>              .driver   = "isa-fdc",
>              .property = "check_media_rate",
>              .value    = "off",
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",

This touches on our "favorite" bit/bool topic again. While I agree that
"no" makes sense for a property of that name, the current code still
expects "on" and "off". In particular, "yes" would not work as expected.

We should either merge support for yes/no or use "off" here.
I had a patch for the former but didn't resubmit after the QOM merge
since I thought we would want to move this from qdev to Object first.

Andreas

>          },
>          { /* end of list */ }
>      },
> @@ -405,6 +409,10 @@ static QEMUMachine pc_machine_v0_15 = {
>              .driver   = "isa-fdc",
>              .property = "check_media_rate",
>              .value    = "off",
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",
>          },
>          { /* end of list */ }
>      },
> @@ -449,6 +457,10 @@ static QEMUMachine pc_machine_v0_14 = {
>              .driver   = "pc-sysfw",
>              .property = "rom_only",
>              .value    = stringify(1),
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",
>          },
>          { /* end of list */ }
>      },
> @@ -505,6 +517,10 @@ static QEMUMachine pc_machine_v0_13 = {
>              .driver   = "pc-sysfw",
>              .property = "rom_only",
>              .value    = stringify(1),
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",
>          },
>          { /* end of list */ }
>      },
> @@ -565,6 +581,10 @@ static QEMUMachine pc_machine_v0_12 = {
>              .driver   = "pc-sysfw",
>              .property = "rom_only",
>              .value    = stringify(1),
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",
>          },
>          { /* end of list */ }
>      }
> @@ -633,6 +653,10 @@ static QEMUMachine pc_machine_v0_11 = {
>              .driver   = "pc-sysfw",
>              .property = "rom_only",
>              .value    = stringify(1),
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",
>          },
>          { /* end of list */ }
>      }
> @@ -713,6 +737,10 @@ static QEMUMachine pc_machine_v0_10 = {
>              .driver   = "pc-sysfw",
>              .property = "rom_only",
>              .value    = stringify(1),
> +        },{
> +            .driver   = "USB",
> +            .property = "full-path",
> +            .value    = "no",
>          },
>          { /* end of list */ }
>      },

> diff --git a/hw/usb/bus.c b/hw/usb/bus.c
> index d3f8358..f1e567b 100644
> --- a/hw/usb/bus.c
> +++ b/hw/usb/bus.c
> @@ -19,6 +19,8 @@ static struct BusInfo usb_bus_info = {
>      .get_fw_dev_path = usb_get_fw_dev_path,
>      .props      = (Property[]) {
>          DEFINE_PROP_STRING("port", USBDevice, port_path),
> +        DEFINE_PROP_BIT("full-path", USBDevice, flags,
> +                        USB_DEV_FLAG_FULL_PATH, true),
>          DEFINE_PROP_END_OF_LIST()
>      },
>  };

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