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Date: Wed, 5 Jun 2019 12:09:42 +0200 From: "kraxel@...hat.com" <kraxel@...hat.com> To: "Zhang, Tina" <tina.zhang@...el.com> Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>, "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>, "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 v2 1/3] vfio: Use capability chains to handle device specific irq Hi, > > Really need to split for different planes? I'd like a > > VFIO_IRQ_SUBTYPE_GFX_DISPLAY_EVENT > > so user space can probe change for all. > User space can choose to user different handlers according to the > specific event. For example, user space might not want to handle every > cursor event due to performance consideration. Besides, it can reduce > the probe times, as we don't need to probe twice to make sure if both > cursor plane and primary plane have been updated. I'd suggest to use the value passed via eventfd for that, i.e. instead of sending "1" unconditionally send a mask of changed planes. cheers, Gerd
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