linux-kernel - Re: [RFC PATCH 1/9] vfio/pci: introduce mediate ops to intercept vfio-pci ops

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Date:   Sun, 8 Dec 2019 22:17:42 -0500
From:   Yan Zhao <yan.y.zhao@...el.com>
To:     Eric Blake <eblake@...hat.com>
Cc:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "libvir-list@...hat.com" <libvir-list@...hat.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
        "He, Shaopeng" <shaopeng.he@...el.com>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>
Subject: Re: [RFC PATCH 1/9] vfio/pci: introduce mediate ops to intercept
 vfio-pci ops

Sorry about that. I'll pay attention to them next time and thank you for
pointing them out :)

On Sat, Dec 07, 2019 at 07:13:30AM +0800, Eric Blake wrote:
> On 12/4/19 9:25 PM, Yan Zhao wrote:
> > when vfio-pci is bound to a physical device, almost all the hardware
> > resources are passthroughed.
> 
> The intent is obvious, but it sounds awkward to a native speaker.
> s/passthroughed/passed through/
> 
> > Sometimes, vendor driver of this physcial device may want to mediate some
> 
> physical
> 
> > hardware resource access for a short period of time, e.g. dirty page
> > tracking during live migration.
> > 
> > Here we introduce mediate ops in vfio-pci for this purpose.
> > 
> > Vendor driver can register a mediate ops to vfio-pci.
> > But rather than directly bind to the passthroughed device, the
> 
> passed-through
> 
> -- 
> Eric Blake, Principal Software Engineer
> Red Hat, Inc.           +1-919-301-3226
> Virtualization:  qemu.org | libvirt.org
>