linux-kernel - Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation

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Message-ID: <877grzdahj.fsf@rustcorp.com.au>
Date:	Wed, 12 Sep 2012 15:54:40 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Sjur Brændeland <sjurbren@...il.com>,
	Amit Shah <amit.shah@...hat.com>, linux-kernel@...r.kernel.org,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC 1/2] virtio_console: Add support for DMA memory allocation

"Michael S. Tsirkin" <mst@...hat.com> writes:
>> virtio: don't crash when device is buggy
>> 
>> Because of a sanity check in virtio_dev_remove, a buggy device can crash
>> kernel.  And in case of rproc it's userspace so it's not a good idea.
>> We are unloading a driver so how bad can it be?
>> Be less aggressive in handling this error: if it's a driver bug,
>> warning once should be enough.
>> 
>> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>
> Rusty?

Thanks, applied.

I really want to implement CONFIG_VIRTIO_DEVEL_DEBUG which would
incorporate the checks in virtio_ring.c as well as this.  Then I could
also reshuffle descriptors (eg. split them) to find buggy devices like
qemu which assume the first descriptor is the struct virtio_net_hdr...

Cheers,
Rusty,
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