Re: [PATHC v6] video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver

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On Wed, Oct 02, 2019 at 08:09:41AM +0000, Dexuan Cui wrote:
-----Original Message-----
From: Sasha Levin <sashal@xxxxxxxxxx>
Sent: Tuesday, October 1, 2019 11:48 AM

On Fri, Sep 20, 2019 at 05:26:34PM +0000, Michael Kelley wrote:
>From: Michael Kelley <mikelley@xxxxxxxxxxxxx>  Sent: Wednesday,
September 18, 2019 2:48 PM
>> >
>> > Without deferred IO support, hyperv_fb driver informs the host to refresh
>> > the entire guest frame buffer at fixed rate, e.g. at 20Hz, no matter there
>> > is screen update or not. This patch supports deferred IO for screens in
>> > graphics mode and also enables the frame buffer on-demand refresh. The
>> > highest refresh rate is still set at 20Hz.
>> >
>> > Currently Hyper-V only takes a physical address from guest as the starting
>> > address of frame buffer. This implies the guest must allocate contiguous
>> > physical memory for frame buffer. In addition, Hyper-V Gen 2 VMs only
>> > accept address from MMIO region as frame buffer address. Due to these
>> > limitations on Hyper-V host, we keep a shadow copy of frame buffer
>> > in the guest. This means one more copy of the dirty rectangle inside
>> > guest when doing the on-demand refresh. This can be optimized in the
>> > future with help from host. For now the host performance gain from
deferred
>> > IO outweighs the shadow copy impact in the guest.
>> >
>> > Signed-off-by: Wei Hu <weh@xxxxxxxxxxxxx>
>
>Sasha -- this patch and one other from Wei Hu for the Hyper-V frame buffer
>driver should be ready.  Both patches affect only the Hyper-V frame buffer
>driver so can go through the Hyper-V tree.  Can you pick these up?  Thx.

I can't get this to apply anywhere, what tree is it based on?

--
Thanks,
Sasha

Hi Sasha,
Today's hyperv/linux.git's hyperv-next branch's top commit is
   48b72a2697d5 ("hv_netvsc: Add the support of hibernation").

Please pick up two patches from Wei Hu:
#1: [PATCH v4] video: hyperv: hyperv_fb: Obtain screen resolution from Hyper-V host
#2: [PATHC v6] video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver

Ah, I guess I was missing the first one. I've queued both for
hyperv-next, thanks!

--
Thanks,
Sasha



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