linux-kernel - Re: [PATCH v5 7/8] hisi_acc_vfio_pci: Add support for VFIO live migration

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Date:   Tue, 22 Feb 2022 20:52:51 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, alex.williamson@...hat.com,
        cohuck@...hat.com, mgurtovoy@...dia.com, yishaih@...dia.com,
        linuxarm@...wei.com, liulongfang@...wei.com,
        prime.zeng@...ilicon.com, jonathan.cameron@...wei.com,
        wangzhou1@...ilicon.com
Subject: Re: [PATCH v5 7/8] hisi_acc_vfio_pci: Add support for VFIO live
 migration

On Mon, Feb 21, 2022 at 11:40:42AM +0000, Shameer Kolothum wrote:

> +	/*
> +	 * ACC VF dev BAR2 region consists of both functional register space
> +	 * and migration control register space. For migration to work, we
> +	 * need access to both. Hence, we map the entire BAR2 region here.
> +	 * But from a security point of view, we restrict access to the
> +	 * migration control space from Guest(Please see mmap/ioctl/read/write
> +	 * override functions).
> +	 *
> +	 * Also the HiSilicon ACC VF devices supported by this driver on
> +	 * HiSilicon hardware platforms are integrated end point devices
> +	 * and has no capability to perform PCIe P2P.

If that is the case why not implement the RUNNING_P2P as well as a
NOP?

Alex expressed concerned about proliferation of non-P2P devices as it
complicates qemu to support mixes

Jason