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Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove |
Date: |
Tue, 10 Feb 2009 12:20:37 +0000 |
User-agent: |
Mutt/1.4.1i |
On Mon, Feb 09, 2009 at 08:41:25PM -0200, Marcelo Tosatti wrote:
> On Mon, Feb 09, 2009 at 08:41:39AM +0000, Daniel P. Berrange wrote:
> >
> > Also bear in mind that we need the ability to hot unplug devices which
> > were specified on the command line argv. For these we currently have
> > neither the pci <domain,bus,slot>, nor are given any 'name'.
>
> Any reason you can't discover <domain,bus,slot> from "info pci" ?
> (domain/bus are always zero at the moment).
'info pci' just gives you a list of PCI devices, and no direct means
to correlate these to devices listed in your command line argv.
eg, I launch QEMU with 3 nics
qemu \
....more args...
-net tap -net nic,mac=01:02:03:04:05:01 \
-net tap -net nic,mac=01:02:03:04:05:02 \
-net tap -net nic,mac=01:02:03:04:05:03 \
....more args...
Then info pci shows this:
...snip...
Bus 0, device 3, function 0:
Ethernet controller: PCI device 10ec:8029
IRQ 11.
BAR0: I/O at 0xc100 [0xc1ff].
Bus 0, device 4, function 0:
Ethernet controller: PCI device 10ec:8029
IRQ 9.
BAR0: I/O at 0xc200 [0xc2ff].
Bus 0, device 5, function 0:
Ethernet controller: PCI device 10ec:8029
IRQ 11.
BAR0: I/O at 0xc300 [0xc3ff].
...snip...
I want to remove NIC with mac adress 01:02:03:04:05:02, but there is
no way to correlate this 'info pci' data to the NIC I wish to remove.
They may happen to appear in the same sorted order immediately after
startup, but if you've hot added & removed a couple of devices already,
then the order from 'info pci' can't easily map back to argv, unless
you very carefully tracked all changes.
> > Markus has previously suggested allowing <domain,bus,slot> to be
> > specified on the cli which would let us manually assign & use that
> > info for unplug.
>
> > A device type specific unique naming would be useful too though. In
> > changeset r6220, Mark McLoughlin provided the ability to give every
> > single NIC a unique name. I'd like to be able to use that name for
> > unplug.
>
> The NIC identifiers are not specific to PCI. So if you specify a
> non-PCI nic with the cli, you should not expect "pci_del name" to work.
> Now I see where you're getting at with the private discussion around
> "dev_add/dev_add".
Yes, if the device already had a unqiue identifier, it some ways it
would be easier to just be able todo 'nic_del 01:02:03:04:05:02'
Or for a SCSI disk 'drive_del bus=scsi,index=3'. QEMU ought to have
enough info internally to be able to map this to the PCI address it
needs to remove.
Daniel
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- [Qemu-devel] [patch 0/2] pci hotplug v2, Marcelo Tosatti, 2009/02/06
- [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Marcelo Tosatti, 2009/02/08
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Avi Kivity, 2009/02/08
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Marcelo Tosatti, 2009/02/08
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Markus Armbruster, 2009/02/09
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Daniel P. Berrange, 2009/02/09
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Marcelo Tosatti, 2009/02/09
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove,
Daniel P. Berrange <=
- Re: [Qemu-devel] [patch 2/2] qemu: PCI device, disk and host network hot-add / hot-remove, Paul Brook, 2009/02/10
[Qemu-devel] [patch 1/2] pci device registration helpers, Marcelo Tosatti, 2009/02/08
Re: [Qemu-devel] [patch 0/2] pci hotplug v2, Marcelo Tosatti, 2009/02/08