linux-kernel - RE: [PATCH v8 7/9] crypto: hisilicon/qm: Set the VF QM state register

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Message-ID: <BN9PR11MB5276FF8757FBB54AA523ECB88C099@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 8 Mar 2022 10:10:22 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
        "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>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.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: [PATCH v8 7/9] crypto: hisilicon/qm: Set the VF QM state register

> From: Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@...wei.com>
> Sent: Tuesday, March 8, 2022 4:46 PM
> 
> 
> 
> > -----Original Message-----
> > From: Tian, Kevin [mailto:kevin.tian@...el.com]
> > Sent: 08 March 2022 06:31
> > To: Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@...wei.com>;
> > kvm@...r.kernel.org; linux-kernel@...r.kernel.org;
> > linux-crypto@...r.kernel.org
> > Cc: linux-pci@...r.kernel.org; alex.williamson@...hat.com;
> jgg@...dia.com;
> > 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 7/9] crypto: hisilicon/qm: Set the VF QM state
> register
> >
> > > From: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> > > Sent: Friday, March 4, 2022 7:01 AM
> > >
> > > From: Longfang Liu <liulongfang@...wei.com>
> > >
> > > We use VF QM state register to record the status of the QM configuration
> > > state. This will be used in the ACC migration driver to determine whether
> > > we can safely save and restore the QM data.
> >
> > Can you say something about what QM is and how it is related to the VF
> state
> > to be migrated? It might be obvious to acc driver people but not so to to
> > others in vfio community like me. 😊
> 
> Ok, understand that. I will lift a description from the QM driver patch :).
> 
> QM stands for Queue Management which is a generic IP used by ACC devices.
> It provides a general PCIe interface for the CPU and the ACC devices to share
> a group of queues.
> 
> QM integrated into an accelerator provides queue management service.
> Queues can be assigned to PF and VFs, and queues can be controlled by
> unified mailboxes and doorbells. The QM
> driver(drivers/crypto/hisilicon/qm.c)
> provides generic interfaces to ACC drivers to manage the QM.
> 
> I will add some of this in either this commit msg or in the actual file
> somewhere.
> 

Yes, such information is helpful