linux-kernel - RE: [PATCH v8 8/9] hisi_acc_vfio_pci: Add support for VFIO live migration

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Message-ID: <aac9a26dc27140d9a1ce56ebdec393a6@huawei.com>
Date:   Mon, 7 Mar 2022 19:29:06 +0000
From:   Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Jason Gunthorpe <jgg@...dia.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>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "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>,
        Xu Zaibo <xuzaibo@...wei.com>
Subject: RE: [PATCH v8 8/9] hisi_acc_vfio_pci: Add support for VFIO live
 migration



> -----Original Message-----
> From: Alex Williamson [mailto:alex.williamson@...hat.com]
> Sent: 07 March 2022 19:05
> To: Jason Gunthorpe <jgg@...dia.com>
> Cc: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>;
> kvm@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-crypto@...r.kernel.org; linux-pci@...r.kernel.org; cohuck@...hat.com;
> mgurtovoy@...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: [PATCH v8 8/9] hisi_acc_vfio_pci: Add support for VFIO live
> migration
> 
> On Fri, 4 Mar 2022 16:57:20 -0400
> Jason Gunthorpe <jgg@...dia.com> wrote:
> 
> > On Thu, Mar 03, 2022 at 11:01:30PM +0000, Shameer Kolothum wrote:
> > > From: Longfang Liu <liulongfang@...wei.com>
> > >
> > > VMs assigned with HiSilicon ACC VF devices can now perform live
> migration
> > > if the VF devices are bind to the hisi_acc_vfio_pci driver.
> > >
> > > Signed-off-by: Longfang Liu <liulongfang@...wei.com>
> > > Signed-off-by: Shameer Kolothum
> <shameerali.kolothum.thodi@...wei.com>
> > > ---
> > >  drivers/vfio/pci/hisilicon/Kconfig            |    7 +
> > >  .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    | 1078 ++++++++++++++++-
> > >  .../vfio/pci/hisilicon/hisi_acc_vfio_pci.h    |  114 ++
> > >  3 files changed, 1181 insertions(+), 18 deletions(-)
> > >  create mode 100644 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
> > >
> > > diff --git a/drivers/vfio/pci/hisilicon/Kconfig
> b/drivers/vfio/pci/hisilicon/Kconfig
> > > index dc723bad05c2..2a68d39f339f 100644
> > > --- a/drivers/vfio/pci/hisilicon/Kconfig
> > > +++ b/drivers/vfio/pci/hisilicon/Kconfig
> > > @@ -3,6 +3,13 @@ config HISI_ACC_VFIO_PCI
> > >  	tristate "VFIO PCI support for HiSilicon ACC devices"
> > >  	depends on ARM64 || (COMPILE_TEST && 64BIT)
> > >  	depends on VFIO_PCI_CORE
> > > +	depends on PCI && PCI_MSI
> >
> > PCI is already in the depends from the 2nd line in
> > drivers/vfio/pci/Kconfig, but it is harmless
> >
> > > +	depends on UACCE || UACCE=n
> > > +	depends on ACPI
> >
> > Scratching my head a bit on why we have these
> 
> Same curiosity from me, each of the CRYPTO_DEV_HISI_* options selected
> also depend on these so they seem redundant.

Yes, they are redundant now since we have added CRYPTO_DEV_HISI_ drivers
as "depends" now. I will remove that.
 
> I think we still require acks from Bjorn and Zaibo for select patches
> in this series.

I checked with Ziabo. He moved projects and is no longer looking into crypto stuff.
Wangzhou and LiuLongfang now take care of this. Received acks from Wangzhou
already and I will request Longfang to provide his. Hope that's ok.

> 
> From me, I would request a MAINTAINERS entry similar to the one the
> mlx5 folks added for their driver.  This should be in patch 4/9 where
> the driver is originally added.  Thanks,

Ok I will do that. I will pick up the R-by tags as well and send out v9 by
tomorrow.

Thanks,
Shameer