Re: [Xen-devel] pci hotplug in xcp

[Ritu kaur <ritu.kaur.us@xxxxxxxxx>]

Thanks Stefano. It did work fine first time however subsequent attach/detach doesn't work. What I did

1. (VM has other-config:pci="" as suggested by Ian)

2. modprobe pciback

3. echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/new_slot

echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/bind

4. start VM

5. xl pci-attach 1 0000:08:01.0(Cross checked in VM can see device via lspci)

6. xl pci-detach 1 0000:08:01.0(Cross checked in VM, no device via lspci)

7. xl pci-attach 1 0000:08:01.0(lspci in VM doesn't list the device)

8. xl pci-list 1 in dom0 lists the device

9. When try to detach I get
xl pci-detach 1 0000:08:01.0

[0] libxl_device.c:444:libxl_wait_for_backend: Backend /local/domain/0/backend/pci/1/0 not ready
[3] libxl.c:1881:libxl_device_pci_remove_xenstore: pci backend at /local/domain/0/backend/pci/1/0 is not ready
[-1] libxl.c:2151:libxl_device_pci_remove: xc_deassign_device failed: Success

dmesg in dom0 has

...
pciback: vpci: 0000:08:01.0: assign to virtual slot 0
pciback: vpci: 0000:08:01.0: assign to virtual slot 0

nothing related to detach. Do I need to run any other command prior to subsequent attach?

Thanks

On Thu, Apr 8, 2010 at 7:47 AM, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:

On Thu, 8 Apr 2010, Ritu kaur wrote:
> Thanks Stefano.
>
> I am having problems binding device to pciback(this is from day1). Driver for this device is not loaded in dom0 so this
> device is not bound to any driver.
>
> #echo $pcidev
> 0000:08:01.0
>
> # echo -n $pcidev > /sys/bus/pci/drivers/pciback/bind
> -bash: echo: write error: No such device
>
> ls -l /sys/bus/pci/drivers/pciback/bind
> --w------- 1 root root 4096 Apr  8 07:40 /sys/bus/pci/drivers/pciback/bind
>
> Any inputs?
>

you need to do this:

echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/new_slot

echo -n "$pcidev" > /sys/bus/pci/drivers/pciback/bind

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