From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?iso-8859-1?Q?Beno=EEt?= Canet <benoit.canet@irqsave.net>
Subject: SR-IOV PF reset and QEMU VFs VFIO passthrough
Date: Sat, 1 Jun 2013 14:13:21 +0200
Message-ID: <20130601121320.GC5157@irqsave.net>
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Hello,

I may have soon the PF driver of an SR-IOV card to code and make work wit=
h
QEMU/KVM so I have the following questions.

In an AMD64 setup where QEMU use VFIO to passthrough the VFs of an SR-IOV=
 card
to a guest will the consequences of a PF FLR be handled fine by QEMU and =
the
guest ?

I read that pci_reset_function would call pci_restore_state restoring the=
 SR-IOV
configuration after the reset of the PF.

The ways the hardware work means that the VFs would disappear and reappea=
r in a
short lapse of time.

Will these events be handled by the kernel pci hotplug code ?

Given that the PF driver restore the PF config space after the reset will=
 /sys
files used by QEMU disappear and reappear messing the QEMU VFIO passthrou=
gh or
will it goes smoothly ?

Best regards

Beno=EEt Canet