From: Rusty Russell <rusty@rustcorp.com.au>
To: Jamie Lokier <jamie@shareable.org>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
virtualization@lists.linux-foundation.org
Subject: Re: [Qemu-devel] Using PCI config space to indicate config location
Date: Wed, 10 Oct 2012 14:14:47 +1030 [thread overview]
Message-ID: <87txu36le8.fsf@rustcorp.com.au> (raw)
In-Reply-To: <20121009210901.GY14867@jl-vm1.vm.bytemark.co.uk>
Jamie Lokier <jamie@shareable.org> writes:
> Rusty Russell wrote:
>> I don't think it'll be that bad; reset clears the device to unknown,
>> bar0 moves it from unknown->legacy mode, bar1/2/3 changes it from
>> unknown->modern mode, and anything else is bad (I prefer being strict so
>> we catch bad implementations from the beginning).
>
> Will that work, if the guest with kernel that uses modern mode, kexecs
> to an older (but presumed reliable) kernel that only knows about legacy mode?
>
> I.e. will the replacement kernel, or (ideally) replacement driver on
> the rare occasion that is needed on a running kernel, be able to reset
> the device hard enough?
Well, you need to reset the device, so yes.
Cheers,
Rusty.
WARNING: multiple messages have this Message-ID (diff)
From: Rusty Russell <rusty@rustcorp.com.au>
To: Jamie Lokier <jamie@shareable.org>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
virtualization@lists.linux-foundation.org,
Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [Qemu-devel] Using PCI config space to indicate config location
Date: Wed, 10 Oct 2012 14:14:47 +1030 [thread overview]
Message-ID: <87txu36le8.fsf@rustcorp.com.au> (raw)
In-Reply-To: <20121009210901.GY14867@jl-vm1.vm.bytemark.co.uk>
Jamie Lokier <jamie@shareable.org> writes:
> Rusty Russell wrote:
>> I don't think it'll be that bad; reset clears the device to unknown,
>> bar0 moves it from unknown->legacy mode, bar1/2/3 changes it from
>> unknown->modern mode, and anything else is bad (I prefer being strict so
>> we catch bad implementations from the beginning).
>
> Will that work, if the guest with kernel that uses modern mode, kexecs
> to an older (but presumed reliable) kernel that only knows about legacy mode?
>
> I.e. will the replacement kernel, or (ideally) replacement driver on
> the rare occasion that is needed on a running kernel, be able to reset
> the device hard enough?
Well, you need to reset the device, so yes.
Cheers,
Rusty.
next prev parent reply other threads:[~2012-10-10 3:44 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-27 0:29 Proposal for virtio standardization Rusty Russell
2012-09-27 0:29 ` [Qemu-devel] " Rusty Russell
2012-09-27 0:29 ` Rusty Russell
2012-10-04 18:49 ` [Qemu-devel] " Anthony Liguori
2012-10-04 18:49 ` Anthony Liguori
2012-10-04 18:49 ` Anthony Liguori
2012-10-08 2:21 ` Using PCI config space to indicate config location Rusty Russell
2012-10-08 2:21 ` Rusty Russell
2012-10-08 2:21 ` [Qemu-devel] " Rusty Russell
2012-10-08 13:58 ` Anthony Liguori
2012-10-08 13:58 ` Anthony Liguori
2012-10-08 14:58 ` Gerd Hoffmann
2012-10-08 14:58 ` Gerd Hoffmann
2012-10-08 15:09 ` Anthony Liguori
2012-10-08 15:09 ` Anthony Liguori
2012-10-08 20:13 ` Gerd Hoffmann
2012-10-08 20:13 ` Gerd Hoffmann
2012-10-08 20:55 ` Anthony Liguori
2012-10-08 20:55 ` Anthony Liguori
2012-10-08 23:56 ` Rusty Russell
2012-10-09 1:51 ` Anthony Liguori
2012-10-09 3:16 ` Rusty Russell
2012-10-09 3:16 ` Rusty Russell
2012-10-09 10:17 ` Avi Kivity
2012-10-09 10:17 ` Avi Kivity
2012-10-09 14:03 ` Anthony Liguori
2012-10-09 14:03 ` Anthony Liguori
2012-10-09 13:56 ` Anthony Liguori
2012-10-09 13:56 ` Anthony Liguori
2012-10-10 3:44 ` Rusty Russell
2012-10-10 3:44 ` Rusty Russell
2012-10-10 11:37 ` Michael S. Tsirkin
2012-10-10 11:37 ` Michael S. Tsirkin
2012-10-09 13:56 ` Anthony Liguori
2012-10-09 21:09 ` Jamie Lokier
2012-10-09 21:09 ` [Qemu-devel] " Jamie Lokier
2012-10-10 3:44 ` Rusty Russell [this message]
2012-10-10 3:44 ` Rusty Russell
2012-10-11 0:08 ` Rusty Russell
2012-10-11 0:08 ` Rusty Russell
2012-10-11 0:08 ` Rusty Russell
2012-10-09 21:09 ` Jamie Lokier
2012-10-09 3:16 ` Rusty Russell
2012-10-09 6:33 ` Gerd Hoffmann
2012-10-09 6:33 ` Gerd Hoffmann
2012-10-09 15:26 ` Anthony Liguori
2012-10-09 15:26 ` Anthony Liguori
2012-10-09 20:24 ` Gerd Hoffmann
2012-10-09 20:24 ` Gerd Hoffmann
2012-10-10 2:54 ` Rusty Russell
2012-10-10 2:54 ` Rusty Russell
2012-10-10 2:54 ` Rusty Russell
2012-10-10 13:36 ` Anthony Liguori
2012-10-10 13:41 ` Michael S. Tsirkin
2012-10-10 13:41 ` Michael S. Tsirkin
2012-10-11 0:43 ` Rusty Russell
2012-10-11 0:43 ` Rusty Russell
2012-10-11 0:43 ` [Qemu-devel] " Rusty Russell
2012-10-09 15:26 ` Anthony Liguori
2012-10-10 8:34 ` Michael S. Tsirkin
2012-10-10 8:34 ` Michael S. Tsirkin
2012-10-08 13:58 ` Anthony Liguori
2012-10-10 8:30 ` Michael S. Tsirkin
2012-10-10 8:30 ` [Qemu-devel] " Michael S. Tsirkin
2012-10-11 1:18 ` Rusty Russell
2012-10-11 1:18 ` [Qemu-devel] " Rusty Russell
2012-10-11 10:23 ` Michael S. Tsirkin
2012-10-11 10:23 ` [Qemu-devel] " Michael S. Tsirkin
2012-10-11 22:29 ` Rusty Russell
2012-10-11 22:29 ` [Qemu-devel] " Rusty Russell
2012-10-12 9:33 ` Michael S. Tsirkin
2012-10-12 9:33 ` [Qemu-devel] " Michael S. Tsirkin
2012-10-12 9:51 ` Rusty Russell
2012-10-12 9:51 ` [Qemu-devel] " Rusty Russell
2012-10-12 10:02 ` Michael S. Tsirkin
2012-10-12 10:02 ` [Qemu-devel] " Michael S. Tsirkin
2012-10-16 13:15 ` Rusty Russell
2012-10-16 13:15 ` Rusty Russell
2012-10-16 13:15 ` [Qemu-devel] " Rusty Russell
2012-10-16 13:30 ` Michael S. Tsirkin
2012-10-16 13:30 ` [Qemu-devel] " Michael S. Tsirkin
2012-10-16 13:52 ` Rusty Russell
2012-10-16 13:52 ` Rusty Russell
2012-10-16 13:52 ` [Qemu-devel] " Rusty Russell
2012-10-11 22:29 ` Rusty Russell
2012-10-09 14:02 ` Proposal for virtio standardization Cornelia Huck
2012-10-09 14:02 ` Cornelia Huck
2012-10-09 14:02 ` [Qemu-devel] " Cornelia Huck
2012-10-10 3:46 ` Rusty Russell
2012-10-10 3:46 ` Rusty Russell
2012-10-10 3:46 ` [Qemu-devel] " Rusty Russell
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