From: Dexuan Cui <decui@microsoft.com>
To: Sasha Levin <sashal@kernel.org>, Wei Hu <weh@microsoft.com>
Cc: Michael Kelley <mikelley@microsoft.com>,
"rdunlap@infradead.org" <rdunlap@infradead.org>,
"shc_work@mail.ru" <shc_work@mail.ru>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"lee.jones@linaro.org" <lee.jones@linaro.org>,
"alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
"baijiaju1990@gmail.com" <baijiaju1990@gmail.com>,
"fthain@telegraphics.com.au" <fthain@telegraphics.com.au>,
"info@metux.net" <info@metux.net>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
KY Srinivasan <kys@microsoft.com>
Subject: RE: [PATCH v5] video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver
Date: Wed, 2 Oct 2019 07:52:27 +0000 [thread overview]
Message-ID: <PU1P153MB0169724E7E7432F1100EE96ABF9C0@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20191001184526.GE8171@sasha-vm>
> From: Sasha Levin <sashal@kernel.org>
> Sent: Tuesday, October 1, 2019 11:45 AM
> To: Wei Hu <weh@microsoft.com>
>
> On Fri, Sep 13, 2019 at 06:02:55AM +0000, Wei Hu wrote:
> >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@microsoft.com>
>
> What tree is this based on? I can't get it to apply.
>
> Thanks,
> Sasha
Please use Wei's v6 patch, which can apply on today's hyperv/linux.git/s hyperv-next branch.
Thanks,
-- Dexuan
prev parent reply other threads:[~2019-10-02 7:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-13 6:02 [PATCH v5] video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver Wei Hu
2019-09-13 6:37 ` Dexuan Cui
2019-09-16 21:46 ` Dexuan Cui
2019-09-13 23:31 ` Michael Kelley
2019-10-01 18:45 ` Sasha Levin
2019-10-02 7:52 ` Dexuan Cui [this message]
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