Re: [Xen-devel] linux-3.4-rc0 XENBUS: Device with no driver: device/vbd/51713

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Saturday, March 31, 2012, 12:07:58 AM, you wrote:

> On Fri, Mar 30, 2012 at 10:52:51PM +0200, Sander Eikelenboom wrote:
>> Hi Konrad,
>> 
>> I just tried linux-3.4-rc0 (linus his tree, last commit 
>> f52b69f86e27903d6896ed5fa7cd280fec8de532) with 3 additional branches from 
>> your tree pulled on top of that:
>> 
>> branch stable/for-ingo-3.4.v2     (required for dom0 to boot)
>> branch stable/for-jens-3.4
>> branch stable/for-jens-3.4-bugfixes
>> 
>> Hypervisor is xen-4.1.3-rc1-pre
>> linux 3.3 vanilla works fine
>> 
>> Booting dom0 goes fine, but PV-guests don't work, it seems something goed 
>> wrong with registrering the devices.
>> Which is kind of strange because i compiled the kernel with the same .config 
>> (all xen stuff is compiled in, no modules).
>> 
>> Nothing else is changed in between, I also tried reverting some of the 
>> xen-front patches but all to no avail .. do you have any suggestions ?


> I think you are hitting this bug (hadn't yet stuck in my 
> for-jens-3.4-bugfixes branch):

You were right as usual :-)
Boots fine with this extra patch !
Still seem to have some strange behavior, seems with pci-passthrough i'm able 
to make network / ahci go berserk on dom-0 by booting the 3.4-rc0 kernel as 
guest and using the device.
But haven't done enough tests to pinpoint anything. Will keep you posted if i 
find anything.

Thx so far !
--
Sander

> commit 252e60f73b023bdbb7c82c05e2c3d97a1233bd9f
> Author: Igor Mammedov <imammedo@xxxxxxxxxx>
> Date:   Tue Mar 27 19:31:08 2012 +0200

>     xen: only check xen_platform_pci_unplug if hvm
>     
>     commit b9136d207f08
>       xen: initialize platform-pci even if xen_emul_unplug=never
>     
>     breaks blkfront/netfront by not loading them because of
>     xen_platform_pci_unplug=0 and it is never set for PV guest.
>     
>     Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
>     Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx>
>     Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

> diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
> index d5e1ab9..98cbeba 100644
> --- a/drivers/block/xen-blkfront.c
> +++ b/drivers/block/xen-blkfront.c
> @@ -1475,7 +1475,7 @@ static int __init xlblk_init(void)
>         if (!xen_domain())
>                 return -ENODEV;
>  
> -       if (!xen_platform_pci_unplug)
> +       if (xen_hvm_domain() && !xen_platform_pci_unplug)
>                 return -ENODEV;
>  
>         if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index 663b32c..0ebbb19 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -1965,7 +1965,7 @@ static int __init netif_init(void)
>         if (xen_initial_domain())
>                 return 0;
>  
> -       if (!xen_platform_pci_unplug)
> +       if (xen_hvm_domain() && !xen_platform_pci_unplug)
>                 return -ENODEV;
>  
>         printk(KERN_INFO "Initialising Xen virtual ethernet driver.\n");




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