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Re: [Qemu-devel] [PATCH 0/8] Basic device state visualization
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] [PATCH 0/8] Basic device state visualization |
Date: |
Fri, 14 May 2010 21:50:40 +0300 |
On 5/14/10, Jan Kiszka <address@hidden> wrote:
> While recently fixing the SCSI reset issues, I once again had the need
> for displaying the state of involved devices. So far the common approach
> is to attach gdb to qemu (or even inject some printf). But that time I
> hacked up a 30-minute patch to dump the vmstate of any (fully converted)
> qdev device.
>
> This series now lays the ground for more sophisticated visulization. It
> adds the monitor command 'device_show <qdev-path>', freezes the vmstate
> of the addressed device, sticks it into a QMP dict, and either transmit
> this via QMP or pretty-prints it on a monitor console. Some example:
>
> (qemu) device_show /i440FX-pcihost/pci.0/piix3-usb-uhci
> dev: piix3-usb-uhci, id ""
> dev.
> version_id: 00000002
> config: a0 7d d1 00 00 00 00 00 - b0 7e d1 00 00 00 00 00
> ...
> irq_state: 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00
> num_ports_vmstate: 02
> ports[00].
> ctrl: 0083
> ports[01].
> ctrl: 0080
> cmd: 00c1
> status: 0000
> intr: 0000
> frnum: 0077
> fl_base_addr: 0fffc000
> sof_timing: 40
> status2: 00
> frame_timer: 0000000000cb2bd0
>
> Basically, this is the level of support I recently saw in a
> demonstration of some commercial simulator as well. We are just lacking
> support for the yet unconverted devices. And I think we can even do
> better on the long term, e.g. by annotating state variables that contain
> flags, or by pretty-printing buffers like the PCI config space, or...
>
> Let's give this a start, I bet it will be helpful while adding complex
> device models like AHCI or EHCI. Looking forward to feedback!
Nice! I think this confirms that there is no future for the qdev side
of my yesterday's patch, this is much better.
[Qemu-devel] Re: [PATCH 0/8] Basic device state visualization, Avi Kivity, 2010/05/14
Re: [Qemu-devel] [PATCH 0/8] Basic device state visualization, Anthony Liguori, 2010/05/14
Re: [Qemu-devel] [PATCH 0/8] Basic device state visualization,
Blue Swirl <=