* Amit Shah <amit.shah@xxxxxxxxxx> wrote:
> 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@xxxxxxxxxx>
>
> Looks fine,
>
> Reviewed-by: Amit Shah <amit.shah@xxxxxxxxxx>
>
> > ---
> >
> > 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.
Thanks! FYI, this patch now lives as:
9472fe7040bb ("virtio_console: Stop doing DMA on the stack")
in tip:x86/asm, and is targeted for a v4.9 merge.
Thanks,
Ingo
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