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Date: Mon, 27 May 2019 14:22:37 +0200 From: Gerd Hoffmann <kraxel@...hat.com> To: Zhenyu Wang <zhenyuw@...ux.intel.com> Cc: Tina Zhang <tina.zhang@...el.com>, intel-gvt-dev@...ts.freedesktop.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, alex.williamson@...hat.com, hang.yuan@...el.com, zhiyuan.lv@...el.com Subject: Re: [PATCH 1/2] vfio: ABI for setting mdev display flip eventfd On Mon, May 27, 2019 at 05:07:41PM +0800, Zhenyu Wang wrote: > On 2019.05.27 16:43:11 +0800, Tina Zhang wrote: > > Add VFIO_DEVICE_SET_GFX_FLIP_EVENTFD ioctl command to set eventfd > > based signaling mechanism to deliver vGPU framebuffer page flip > > event to userspace. > > Should we add probe to see if driver can support gfx flip event? Userspace can simply call VFIO_DEVICE_SET_GFX_FLIP_EVENTFD and see if it worked. If so -> use the eventfd. Otherwise take the fallback path (timer based polling). I can't see any advantage a separate feature probe steps adds. cheers, Gerd
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