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Date: Thu, 21 Aug 2014 13:50:22 +0530
Message-ID: <CAK=zhgoU0EywreqEWo+sG8Qy60V4a8fBb4i7Uh30NEj0w+v7bA@mail.gmail.com>
Subject: Re: How to get the number of VFs assigned to the guests in XEN
From: Sreekanth Reddy <sreekanth.reddy@avagotech.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-pci@vger.kernel.org,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Christoph Hellwig <hch@lst.de>,
        Sathya Prakash <sathya.prakash@avagotech.com>,
        Nagalakshmi Nandigama <nagalakshmi.nandigama@avagotech.com>,
        boris.ostrovsky@oracle.com
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Yes, devices are binded to pci-back.

On Thu, Aug 21, 2014 at 3:59 AM, Konrad Rzeszutek Wilk
<konrad.wilk@oracle.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