linux-kernel - Re: [RFC v4 7/8] hisi_acc_vfio_pci: Add support for VFIO live migration

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Message-ID: <20220208160112.GG4160@nvidia.com>
Date:   Tue, 8 Feb 2022 12:01:12 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "mgurtovoy@...dia.com" <mgurtovoy@...dia.com>,
        "yishaih@...dia.com" <yishaih@...dia.com>,
        Linuxarm <linuxarm@...wei.com>,
        liulongfang <liulongfang@...wei.com>,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        "Wangzhou (B)" <wangzhou1@...ilicon.com>
Subject: Re: [RFC v4 7/8] hisi_acc_vfio_pci: Add support for VFIO live
 migration

On Tue, Feb 08, 2022 at 03:48:16PM +0000, Shameerali Kolothum Thodi wrote:

> > > +static int hisi_acc_vfio_pci_init(struct hisi_acc_vf_core_device
> > *hisi_acc_vdev)
> > > +{
> > > +	struct vfio_pci_core_device *vdev = &hisi_acc_vdev->core_device;
> > > +	struct pci_dev *vf_dev = vdev->pdev;
> > > +	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
> > > +
> > > +	/*
> > > +	 * 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.
> > > +	 */
> > > +	vf_qm->io_base =
> > > +		ioremap(pci_resource_start(vf_dev, VFIO_PCI_BAR2_REGION_INDEX),
> > > +			pci_resource_len(vf_dev, VFIO_PCI_BAR2_REGION_INDEX));
> > > +	if (!vf_qm->io_base)
> > > +		return -EIO;
> > > +
> > > +	vf_qm->fun_type = QM_HW_VF;
> > > +	vf_qm->pdev = vf_dev;
> > > +	mutex_init(&vf_qm->mailbox_lock);
> > 
> > mailbox_lock seems unused
> 
> I think we need that as that will be used in the QM driver APIs. I will add a
> comment here.

Perhaps you need some 'init hisi_qm' function to make this more clear
instead of opening coding initing so other module's structure?

Jason