linux-kernel - Re: [Xen-devel] [RFC PATCH 3/5] xen-pciback: Document when we FLR an PCI device.

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Date:	Mon, 16 Dec 2013 09:27:19 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	<gordan@...ich.net>, <xen-devel@...ts.xenproject.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [RFC PATCH 3/5] xen-pciback: Document when we
 FLR an PCI device.

>>> On 13.12.13 at 17:09, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> When the toolstack wants us to drop or add an PCI device it
> changes the XenBus state to Configuring - and as result of that
> we find out which devices we should still be exporting out and
> which ones not. For the ones we don't need anymore we need to
> do an PCI reset so that it is ready for the next guest.
> 
> We are already doing it - but it was not clear _how_
> it was done. This should make it more obvious.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>...
> --- a/drivers/xen/xen-pciback/pci_stub.c
> +++ b/drivers/xen/xen-pciback/pci_stub.c
> @@ -267,18 +267,8 @@ void pcistub_put_pci_dev(struct pci_dev *dev)
>  	/* Cleanup our device
>  	 * (so it's ready for the next domain)
>  	 */
> +	pcistub_reset_pci_dev(dev);
>  
> -	/* This is OK - we are running from workqueue context
> -	 * and want to inhibit the user from fiddling with 'reset'
> -	 */
> -	pci_reset_function(dev);
> -	pci_restore_state(dev);
> -
> -	/* This disables the device. */
> -	xen_pcibk_reset_device(dev);
> -
> -	/* And cleanup up our emulated fields. */
> -	xen_pcibk_config_reset_dev(dev);
>  	xen_pcibk_config_free_dyn_fields(dev);
>  
>  	xen_unregister_device_domain_owner(dev);

Does this really belong here? It's neither covered by the description,
nor can I see where pcistub_reset_pci_dev() would be defined (i.e.
afaict this ought to yield a build or load time error).

Jan

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