Linux Virtualization - May 2008 - [Fwd: [PATCH]: Fix silly output for virtio devices in /proc/interrupts]

(sent to the kvm list erroneously)
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From: Chris Lalancette <clalance at redhat.com>
Subject: [PATCH]: Fix silly output for virtio devices in /proc/interrupts
Date: Wed, 21 May 2008 14:51:45 +0200
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http://lists.linux-foundation.org/pipermail/virtualization/attachments/20080521/38a29f92/attachment.eml

On Wednesday 21 May 2008 23:13:05 Chris Lalancette
wrote:
> Author: Chris Lalancette <clalance at redhat.com>
> Date: ? Thu May 15 09:04:55 2008 -0400
>
> ? ? register_virtio_device was doing something silly, in that it was
> overwriting what the calling driver stuck into .bus_id" for the name.
?This
> caused problems in the output of /proc/interrupts, since when you
> request_irq(), it doesn't actually copy the devname you pass in but
just
> stores a pointer to the data. ?The fix is to just not have
> register_virtio_device do anything with the bus_id, and assume the higher
> level driver set it up properly.
OK, but only one higher-level driver will set it up properly: kvm.  Neither
lguest nor s/390 do this, and as a result, they fail to register *any*
devices.

The following patch should fix it for s/390 (it's identical to the lguest
patch), but would prefer testing (S/390-ers cc'd).

==virtio: S/390 set name of virtio devices directly.

Chris has a patch 'Fix silly output for virtio devices in
/proc/interrupts'
which requires callers to the virtio driver infrastructure to set the bus_ids
themselves.  This does that for s/390.

Signed-off-by: Rusty Russell <rusty at rustcorp.com.au>
Cc: Christian Borntraeger <borntraeger at de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
Cc: Carsten Otte <cotte at de.ibm.com>
Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
Cc: Chris Lalancette <clalance at redhat.com>
---
 drivers/s390/kvm/kvm_virtio.c |    2 ++
 1 file changed, 2 insertions(+)

diff -r c903ef6b391f drivers/s390/kvm/kvm_virtio.c
--- a/drivers/s390/kvm/kvm_virtio.c	Thu May 22 22:31:31 2008 +1000
+++ b/drivers/s390/kvm/kvm_virtio.c	Thu May 22 22:32:55 2008 +1000
@@ -265,6 +265,8 @@ static void add_kvm_device(struct kvm_de
 
 	kdev->vdev.dev.parent = &kvm_root;
 	kdev->vdev.index = dev_index++;
+	snprintf(kdev->vdev.dev.bus_id, BUS_ID_SIZE, "virtio%d",
+		 kdev->vdev.index);
 	kdev->vdev.id.device = d->type;
 	kdev->vdev.config = &kvm_vq_configspace_ops;
 	kdev->desc = d;