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From: "kraxel@redhat.com" <kraxel@redhat.com>
To: "Zhang, Tina" <tina.zhang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>,
	"intel-gvt-dev@lists.freedesktop.org" 
	<intel-gvt-dev@lists.freedesktop.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Lv, Zhiyuan" <zhiyuan.lv@intel.com>,
	"Wang, Zhi A" <zhi.a.wang@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"Yuan, Hang" <hang.yuan@intel.com>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>
Subject: Re: [RFC PATCH v2 1/3] vfio: Use capability chains to handle device specific irq
Date: Wed, 5 Jun 2019 12:09:42 +0200	[thread overview]
Message-ID: <20190605100942.bceke6yqjynuwk3z@sirius.home.kraxel.org> (raw)
In-Reply-To: <237F54289DF84E4997F34151298ABEBC87646B5C@SHSMSX101.ccr.corp.intel.com>

  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


  reply	other threads:[~2019-06-05 10:09 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-04  9:55 [RFC PATCH v2 0/3] Deliver vGPU page flip events to userspace Tina Zhang
2019-06-04  9:55 ` [RFC PATCH v2 1/3] vfio: Use capability chains to handle device specific irq Tina Zhang
2019-06-05  4:04   ` Zhenyu Wang
2019-06-05  9:18     ` Zhang, Tina
2019-06-05 10:09       ` kraxel [this message]
2019-06-06  2:57         ` Tian, Kevin
2019-06-06 10:17         ` Zhang, Tina
2019-06-06 16:25           ` Alex Williamson
2019-06-04  9:55 ` [RFC PATCH v2 2/3] drm/i915/gvt: Leverage irq capability chain to get eventfd Tina Zhang
2019-06-04  9:55 ` [RFC PATCH v2 3/3] drm/i915/gvt: Send plane flip events to user space Tina Zhang

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