netdev - Re: [PATCH V7 mlx5-next 09/15] vfio: Extend the device migration protocol with RUNNING

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Date:   Wed, 16 Feb 2022 08:11:40 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     Yishai Hadas <yishaih@...dia.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "saeedm@...dia.com" <saeedm@...dia.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "leonro@...dia.com" <leonro@...dia.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "mgurtovoy@...dia.com" <mgurtovoy@...dia.com>,
        "maorg@...dia.com" <maorg@...dia.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>
Subject: Re: [PATCH V7 mlx5-next 09/15] vfio: Extend the device migration
 protocol with RUNNING_P2P

On Wed, Feb 16, 2022 at 02:52:55AM +0000, Tian, Kevin wrote:

> btw can disabling PCI bus master be a general means for devices which
> don't have a way of blocking P2P to implement RUNNING_P2P? 

I think if it works for a specific device then that device's driver
can use it.

I wouldn't make something general, too likely a device will blow up if
you do this to it.

Jason