linux-kernel - Re: [PATCH 1/3] virtio_net: Stop doing DMA from the stack

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Date:	Wed, 28 Oct 2015 11:07:50 +0900
From:	Joerg Roedel <jroedel@...e.de>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, benh@...nel.crashing.org,
	KVM <kvm@...r.kernel.org>, dwmw2@...radead.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH 1/3] virtio_net: Stop doing DMA from the stack

On Tue, Oct 27, 2015 at 06:17:08PM -0700, Andy Lutomirski wrote:
> From: Andy Lutomirski <luto@...capital.net>
> 
> Once virtio starts using the DMA API, we won't be able to safely DMA
> from the stack.  virtio-net does a couple of config DMA requests
> from small stack buffers -- switch to using dynamically-allocated
> memory.
> 
> This should have no effect on any performance-critical code paths.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  drivers/net/virtio_net.c | 53 ++++++++++++++++++++++++++++++++----------------
>  1 file changed, 36 insertions(+), 17 deletions(-)

Reviewed-by: Joerg Roedel <jroedel@...e.de>
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