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Date: Thu, 27 Jun 2019 08:44:15 +0000 From: "Zhang, Tina" <tina.zhang@...el.com> To: Gerd Hoffmann <kraxel@...hat.com> CC: "intel-gvt-dev@...ts.freedesktop.org" <intel-gvt-dev@...ts.freedesktop.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>, "Lv, Zhiyuan" <zhiyuan.lv@...el.com>, "Wang, Zhi A" <zhi.a.wang@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>, "Yuan, Hang" <hang.yuan@...el.com>, "alex.williamson@...hat.com" <alex.williamson@...hat.com> Subject: RE: [RFC PATCH v3 0/4] Deliver vGPU display vblank event to userspace > -----Original Message----- > From: Gerd Hoffmann [mailto:kraxel@...hat.com] > Sent: Thursday, June 27, 2019 2:23 PM > To: Zhang, Tina <tina.zhang@...el.com> > Cc: intel-gvt-dev@...ts.freedesktop.org; kvm@...r.kernel.org; linux- > kernel@...r.kernel.org; zhenyuw@...ux.intel.com; Lv, Zhiyuan > <zhiyuan.lv@...el.com>; Wang, Zhi A <zhi.a.wang@...el.com>; Tian, Kevin > <kevin.tian@...el.com>; Yuan, Hang <hang.yuan@...el.com>; > alex.williamson@...hat.com > Subject: Re: [RFC PATCH v3 0/4] Deliver vGPU display vblank event to > userspace > > Hi, > > > Instead of delivering page flip events, we choose to post display > > vblank event. Handling page flip events for both primary plane and > > cursor plane may make user space quite busy, although we have the > > mask/unmask mechansim for mitigation. Besides, there are some cases > > that guest app only uses one framebuffer for both drawing and display. > > In such case, guest OS won't do the plane page flip when the > > framebuffer is updated, thus the user land won't be notified about the > updated framebuffer. > > What happens when the guest is idle and doesn't draw anything to the > framebuffer? The vblank event will be delivered to userspace as well, unless guest OS disable the pipe. Does it make sense to vfio/display? Thanks. BR, Tina > > cheers, > Gerd
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