linux-kernel - Re: How to get the number of VFs assigned to the guests in XEN

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Date:	Thu, 21 Aug 2014 13:50:22 +0530
From:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>,
	Sathya Prakash <sathya.prakash@...gotech.com>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	boris.ostrovsky@...cle.com
Subject: Re: How to get the number of VFs assigned to the guests in XEN

Yes, devices are binded to pci-back.

On Thu, Aug 21, 2014 at 3:59 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> On Wed, Aug 20, 2014 at 04:33:29PM +0530, Sreekanth Reddy wrote:
>> HI,
>>
>>
>>
>> For SRIOV support, currently in the KVM environment, mpt3sas driver can use
>> the API pci_vfs_assigned() to know the number of VFs that are currently
>> assigned to the running VMs. So that during the PF driver unload time, if
>> the return value of this API is greater than zero the our driver won't call
>> the pci_disable_sriov() to disable the VFs.
>>
>>
>>
>> Now for the same purpose in XEN environment, is there any API similar to
>> pci_vfs_assigned() which the low lever device driver can use to know 'the
>> number of VFs that are currently assigned to the running VMs'. In XEN
>> environment this API pci_vfs_assigned() will return always zero even though
>> VFs are assigned to the running VMs.
>
> Odd. It should return the same value. Are the devices binded to pci-back?
>
>>
>>
>>
>> Regards,
>>
>> Sreekanth
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