RE: [PATCH RFC] video: Add Hyper-V Synthetic Video Frame BufferDriver

From: Haiyang Zhang
Date: Tue Feb 19 2013 - 14:05:49 EST

> -----Original Message-----
> From: linux-fbdev-owner@xxxxxxxxxxxxxxx [mailto:linux-fbdev-
> owner@xxxxxxxxxxxxxxx] On Behalf Of Olaf Hering
> Sent: Tuesday, February 19, 2013 1:40 PM
> To: Haiyang Zhang
> Cc: FlorianSchandinat@xxxxxx; linux-fbdev@xxxxxxxxxxxxxxx; KY Srinivasan;
> jasowang@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH RFC] video: Add Hyper-V Synthetic Video Frame Buffer
> Driver
> On Tue, Feb 19, Haiyang Zhang wrote:
> > The emulated video device is a separate device from the synthetic
> video.
> > The synthetic driver can only take control of the synthetic video, but
> not
> > the emulated video.
> Please add this to the comment above.

Will do.

> > Actually, we already have a similar mechanism in ata/ata_piix.c to
> disable
> > emulated IDE drive on Hyper-V, so it won't conflict with the synthetic
> drive.
> I havent read the vesafb code, but I think it can kind of give up the
> hardware, something ata_piix can not do.

In my test, the vesafb doesn't automatically give up the emulated video device,
unless I add the DMI based mechanism to let it exit on Hyper-V.

- Haiyang

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