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SubjectRE: [PATCH v5 7/8] hisi_acc_vfio_pci: Add support for VFIO live migration
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> -----Original Message-----
> From: Jason Gunthorpe [mailto:jgg@nvidia.com]
> Sent: 23 February 2022 00:53
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
> Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org;
> linux-crypto@vger.kernel.org; alex.williamson@redhat.com;
> cohuck@redhat.com; mgurtovoy@nvidia.com; yishaih@nvidia.com; Linuxarm
> <linuxarm@huawei.com>; liulongfang <liulongfang@huawei.com>; Zengtao (B)
> <prime.zeng@hisilicon.com>; Jonathan Cameron
> <jonathan.cameron@huawei.com>; Wangzhou (B) <wangzhou1@hisilicon.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

Since both PRE_COPY and P2P are optional, Qemu anyway will have to check and
add the support, right?. Just worried the FSM will look complicated with both
PRE_COPY and P2P arcs now.

Thanks,
Shameer

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