linux-kernel - Re: [PATCH] virtio_console: Stop doing DMA on the stack

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Date:   Tue, 6 Sep 2016 12:33:43 +0530
From:   Amit Shah <amit.shah@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH] virtio_console: Stop doing DMA on the stack

On (Tue) 30 Aug 2016 [08:04:15], Andy Lutomirski wrote:
> virtio_console uses a small DMA buffer for control requests.  Move
> that buffer into heap memory.
> 
> Doing virtio DMA on the stack is normally okay on non-DMA-API virtio
> systems (which is currently most of them), but it breaks completely
> if the stack is virtually mapped.
> 
> Tested by typing both directions using picocom aimed at /dev/hvc0.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Looks fine,

Reviewed-by: Amit Shah <amit.shah@...hat.com>

> ---
> 
> Hi all-
> 
> This is currently broken in tip:x86/asm.  If you (Amit) like this patch,
> would it make sense for Ingo to add it to -tip?

Yes, I'm fine with that.


     	 Amit