linux-kernel - Re: [RFC PATCH v2 1/3] vfio: Use capability chains to handle device specific irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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