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

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Message-ID: <CALCETrXsOQN28W0eMJcMR+oj8LeMJM=MUiNyECx=ysscE8vQxA@mail.gmail.com>
Date:	Tue, 27 Oct 2015 19:14:32 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Joerg Roedel <jroedel@...e.de>
Cc:	Andy Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <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>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	KVM <kvm@...r.kernel.org>, David Woodhouse <dwmw2@...radead.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: [PATCH 1/3] virtio_net: Stop doing DMA from the stack

On Tue, Oct 27, 2015 at 7:07 PM, Joerg Roedel <jroedel@...e.de> wrote:
> 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>

Should I just send this to netdev now for 4.4?  We could get this one
out of the way, maybe.

--Andy

-- 
Andy Lutomirski
AMA Capital Management, LLC
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