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From: "Benoît Canet" <benoit.canet@irqsave.net>
To: linux-pci@vger.kernel.org, qemu-devel@nongnu.org,
	iommu@lists.linux-foundation.org, alex.williamson@redhat.com
Subject: SR-IOV PF reset and QEMU VFs VFIO passthrough
Date: Sat, 1 Jun 2013 14:13:21 +0200	[thread overview]
Message-ID: <20130601121320.GC5157@irqsave.net> (raw)


Hello,

I may have soon the PF driver of an SR-IOV card to code and make work with
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 reappear 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 passthrough or
will it goes smoothly ?

Best regards

Benoît Canet

WARNING: multiple messages have this Message-ID (diff)
From: "Benoît Canet" <benoit.canet@irqsave.net>
To: linux-pci@vger.kernel.org, qemu-devel@nongnu.org,
	iommu@lists.linux-foundation.org, alex.williamson@redhat.com
Subject: [Qemu-devel] SR-IOV PF reset and QEMU VFs VFIO passthrough
Date: Sat, 1 Jun 2013 14:13:21 +0200	[thread overview]
Message-ID: <20130601121320.GC5157@irqsave.net> (raw)


Hello,

I may have soon the PF driver of an SR-IOV card to code and make work with
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 reappear 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 passthrough or
will it goes smoothly ?

Best regards

Benoît Canet

             reply	other threads:[~2013-06-01 12:13 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-01 12:13 Benoît Canet [this message]
2013-06-01 12:13 ` [Qemu-devel] SR-IOV PF reset and QEMU VFs VFIO passthrough Benoît Canet
     [not found] ` <20130601121320.GC5157-J9ArbTHlV+bR7s880joybQ@public.gmane.org>
2013-06-02 14:11   ` Alex Williamson
2013-06-02 14:11     ` [Qemu-devel] " Alex Williamson
2013-06-02 14:11     ` Alex Williamson
2013-06-02 15:13     ` [Qemu-devel] " Benoît Canet
2013-06-03 18:41 ` Don Dutile
2013-06-03 18:41   ` Don Dutile
2013-06-03 19:29   ` Benoît Canet
2013-06-03 19:29     ` Benoît Canet
     [not found]     ` <20130603192958.GB31044-J9ArbTHlV+bR7s880joybQ@public.gmane.org>
2013-06-03 20:55       ` Don Dutile
2013-06-03 20:55         ` Don Dutile
2013-06-03 20:55         ` Don Dutile
     [not found]         ` <51AD02B1.8070503-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-03 21:27           ` Benoît Canet
2013-06-03 21:27             ` Benoît Canet
2013-06-03 21:27             ` Benoît Canet
     [not found]             ` <20130603212723.GG4094-J9ArbTHlV+bR7s880joybQ@public.gmane.org>
2013-06-03 21:42               ` Don Dutile
2013-06-03 21:42                 ` Don Dutile
2013-06-03 21:42                 ` Don Dutile
     [not found]                 ` <51AD0DB8.8090109-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-03 21:58                   ` Benoît Canet
2013-06-03 21:58                     ` Benoît Canet
2013-06-03 21:58                     ` Benoît Canet
     [not found]                     ` <20130603215855.GC31044-J9ArbTHlV+bR7s880joybQ@public.gmane.org>
2013-06-03 22:03                       ` Don Dutile
2013-06-03 22:03                         ` Don Dutile
2013-06-03 22:03                         ` Don Dutile
     [not found]                         ` <51AD12AB.1000903-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-06-04 15:54                           ` Benoît Canet
2013-06-04 15:54                             ` Benoît Canet
2013-06-04 15:54                             ` Benoît Canet

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