Re: [Qemu-devel] [PATCH] monitor: Add info qom-tree subcommand.

[Hani Benhabiles <kroosec@gmail.com>]

On Wed, May 07, 2014 at 05:39:36PM +0200, Andreas Färber wrote:
> Hi Hani,
> 
> Am 27.04.2014 12:29, schrieb Hani Benhabiles:
> > Signed-off-by: Hani Benhabiles <hani@linux.com>
> > ---
> > 
> > Not sure whether the qobject stringifying functions could fit or be of some use
> > elsewhere. Thus, I kept them as static near the only place where they are used
> > at the moment.
> 
> Your "info qom-tree" reads quite similar to my proposed qom-tree script:
> http://patchwork.ozlabs.org/patch/317224/
> 
> For HMP I had been working on a command "info qom-composition" that
> emits a trimmed-down overview-style output, such as for x86_64:
> 
> (qemu) info qom-composition
> /machine (pc-i440fx-2.1-machine)
>   /peripheral-anon (container)
>   /peripheral (container)
>   /unattached (container)
>     /sysbus (System)
>     /device[0] (qemu64-x86_64-cpu)
>       /apic (apic)
>     /device[1] (kvmvapic)
>     /device[2] (i440FX)
>     /device[3] (PIIX3)
>       /isa.0 (ISA)
>     /device[4] (isa-i8259)
>     /device[5] (isa-i8259)
>     /device[6] (cirrus-vga)
>     /device[7] (hpet)
>     /device[8] (mc146818rtc)
>     /device[9] (isa-pit)
>     /device[10] (isa-pcspk)
>     /device[11] (isa-serial)
>     /device[12] (isa-parallel)
>     /device[13] (i8042)
>     /device[14] (vmport)
>     /device[15] (vmmouse)
>     /device[16] (port92)
>     /device[17] (isa-fdc)
>     /device[18] (e1000)
>     /device[19] (piix3-ide)
>       /ide.0 (IDE)
>       /ide.1 (IDE)
>     /device[20] (ide-cd)
>     /device[21] (PIIX4_PM)
>       /i2c (i2c-bus)
>     /device[22] (smbus-eeprom)
>     /device[23] (smbus-eeprom)
>     /device[24] (smbus-eeprom)
>     /device[25] (smbus-eeprom)
>     /device[26] (smbus-eeprom)
>     /device[27] (smbus-eeprom)
>     /device[28] (smbus-eeprom)
>     /device[29] (smbus-eeprom)
>   /icc-bridge (icc-bridge)
>     /icc (icc-bus)
>   /fw_cfg (fw_cfg)
>   /i440fx (i440FX-pcihost)
>     /pci.0 (PCI)
>     /ioapic (ioapic)
> 
> I believe both commands can coexist. Question is how.
> 
> My tree-walking implementation is not based on QMP and thus much
> slimmer. I didn't have to care about printing properties yet - that I
> deferred to a qom-get HMP command (which based on previous feedback we
> should implement either way). Possibly we could rebase your patch onto
> mine, adding an argument for whether or not to print the properties?
>

Sure, I am fine with rebasing the patch on top of yours if that ends up with
less duplicated work.

> Compared to my script, your "info qom-tree" does not allow to change the
> root, so I believe we would need to print from "/" on (rather than
> "/machine"), for dumping RNG backends etc. as well. The alternative
> would be having arguments to the command, for specifying root and/or
> output style.

A path argument (defaulting to "/") seems like a good approach to me, but I have
no strong preference on this.