Re: [PATCH v8 8/9] hisi_acc_vfio_pci: Add support for VFIO live migration

[Alex Williamson <alex.williamson@redhat.com>]

On Fri, 4 Mar 2022 20:36:24 +0000
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com> wrote:

> > -----Original Message-----
> > From: Alex Williamson [mailto:alex.williamson@redhat.com]
> > Sent: 04 March 2022 19:44
> > To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
> > Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org;
> > linux-crypto@vger.kernel.org; linux-pci@vger.kernel.org; jgg@nvidia.com;
> > cohuck@redhat.com; mgurtovoy@nvidia.com; yishaih@nvidia.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 v8 8/9] hisi_acc_vfio_pci: Add support for VFIO live
> > migration
> > 
> > On Fri, 4 Mar 2022 08:48:27 +0000
> > Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
> > wrote:
> >   
> > > Hi Alex,
> > >  
> > > > -----Original Message-----
> > > > From: Shameerali Kolothum Thodi
> > > > Sent: 03 March 2022 23:02
> > > > To: kvm@vger.kernel.org; linux-kernel@vger.kernel.org;
> > > > linux-crypto@vger.kernel.org
> > > > Cc: linux-pci@vger.kernel.org; alex.williamson@redhat.com;  
> > jgg@nvidia.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: [PATCH v8 8/9] hisi_acc_vfio_pci: Add support for VFIO live  
> > migration  
> > > >
> > > > From: Longfang Liu <liulongfang@huawei.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@huawei.com>
> > > > Signed-off-by: Shameer Kolothum  
> > <shameerali.kolothum.thodi@huawei.com>  
> > >
> > > [...]  
> > > > +
> > > > +static int vf_qm_check_match(struct hisi_acc_vf_core_device  
> > *hisi_acc_vdev,  
> > > > +			     struct hisi_acc_vf_migration_file *migf) {
> > > > +	struct acc_vf_data *vf_data = &migf->vf_data;
> > > > +	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
> > > > +	struct hisi_qm *pf_qm = &hisi_acc_vdev->vf_qm;  
> > >
> > > Oops, the above has to be,
> > >   struct hisi_qm *pf_qm = hisi_acc_vdev->pf_qm;
> > >
> > > This was actually fixed in v6, but now that I rebased mainly to v5, missed it.
> > > Please let me know if you want a re-spin with the above fix(in case there are  
> > no further  
> > > comments) or this is something you can take care.  
> > 
> > To confirm, you're looking for this change:
> > 
> > diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> > b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> > index aa2e4b6bf598..f2a0c046413f 100644
> > --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> > +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> > @@ -413,7 +413,7 @@ static int vf_qm_check_match(struct
> > hisi_acc_vf_core_device *hisi_acc_vdev,
> >  {
> >  	struct acc_vf_data *vf_data = &migf->vf_data;
> >  	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
> > -	struct hisi_qm *pf_qm = &hisi_acc_vdev->vf_qm;
> > +	struct hisi_qm *pf_qm = &hisi_acc_vdev->pf_qm;
> >  	struct device *dev = &vf_qm->pdev->dev;
> >  	u32 que_iso_state;
> >  	int ret;
> > 
> > Right?   
> 
> Not really. pf_qm is a pointer. This is the change,
> 
> diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> index 53e4c5cb3a71..54813772a071 100644
> --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> @@ -413,7 +413,7 @@ static int vf_qm_check_match(struct hisi_acc_vf_core_device *hisi_acc_vdev,
>  {
>  	struct acc_vf_data *vf_data = &migf->vf_data;
>  	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
> -	struct hisi_qm *pf_qm = &hisi_acc_vdev->vf_qm;
> +	struct hisi_qm *pf_qm = hisi_acc_vdev->pf_qm;
>  	struct device *dev = &vf_qm->pdev->dev;
>  	u32 que_iso_state;
>  	int ret;
> 

Got it.  Thanks,

Alex