netdev - RE: [PATCH RFC] pci: Control whether VFs are probed on pci_enable

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Date:	Sun, 7 Dec 2014 17:05:06 +0000
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	Eli Cohen <eli@....mellanox.co.il>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>
CC:	linux-pci <linux-pci@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	"ogerlitz@...lanox.com" <ogerlitz@...lanox.com>,
	"yevgenyp@...lanox.com" <yevgenyp@...lanox.com>,
	Eli Cohen <eli@...lanox.com>,
	Donald Dutile <ddutile@...hat.com>
Subject: RE: [PATCH RFC] pci: Control whether VFs are probed on
 pci_enable_sriov


>This can save host side resource usage by VF instances which would be
>eventually probed to VMs.

>Use a parameter to pci_enable_sriov to control that policy, and modify
>all current callers such that they retain the same functionality.

What's the end-game here? How eventually would this be controlled?

>Use a one shot flag on struct pci_device which is cleared after the
>first probe is ignored so subsequent attempts go through.

Does a one-shot flag suffice? E.g., consider assigning a VF to VM and
than shutting down the VM. Assuming this feature is disabled,
the VF didn't appear on the hypervisor prior to the assignment but
will appear after its shutdown.
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