From: "Tian, Kevin" <kevin.tian@intel.com>
To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>
Cc: "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"jgg@nvidia.com" <jgg@nvidia.com>,
"mgurtovoy@nvidia.com" <mgurtovoy@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>,
"He, Shaopeng" <shaopeng.he@intel.com>,
"Zhao, Yan Y" <yan.y.zhao@intel.com>
Subject: RE: [PATCH v3 0/6] vfio/hisilicon: add acc live migration driver
Date: Wed, 29 Sep 2021 09:05:54 +0000 [thread overview]
Message-ID: <BN9PR11MB54338A0821C061FEE018F43E8CA99@BN9PR11MB5433.namprd11.prod.outlook.com> (raw)
In-Reply-To: <2e0c062947b044179603ab45989808ff@huawei.com>
> From: Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@huawei.com>
>
> Hi Kevin,
>
> > From: Tian, Kevin [mailto:kevin.tian@intel.com]
> > Sent: 29 September 2021 04:58
> >
> > Hi, Shameer,
> >
> > > From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> > > Sent: Wednesday, September 15, 2021 5:51 PM
> > >
> > > Hi,
> > >
> > > Thanks to the introduction of vfio_pci_core subsystem framework[0],
> > > now it is possible to provide vendor specific functionality to
> > > vfio pci devices. This series attempts to add vfio live migration
> > > support for HiSilicon ACC VF devices based on the new framework.
> > >
> > > HiSilicon ACC VF device MMIO space includes both the functional
> > > register space and migration control register space. As discussed
> > > in RFCv1[1], this may create security issues as these regions get
> > > shared between the Guest driver and the migration driver.
> > > Based on the feedback, we tried to address those concerns in
> > > this version.
> >
> > This series doesn't mention anything related to dirty page tracking.
> > Are you rely on Keqian's series for utilizing hardware iommu dirty
> > bit (e.g. SMMU HTTU)?
>
> Yes, this doesn't have dirty page tracking and the plan is to make use of
> Keqian's SMMU HTTU work to improve performance. We have done basic
> sanity testing with those patches.
>
Do you plan to support migration w/o HTTU as the fallback option?
Generally one would expect the basic functionality ready before talking
about optimization.
If not, how does userspace know that migration of a given device can
be allowed only when the iommu supports hardware dirty bit?
Thanks
Kevin
next prev parent reply other threads:[~2021-09-29 9:06 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-15 9:50 [PATCH v3 0/6] vfio/hisilicon: add acc live migration driver Shameer Kolothum
2021-09-15 9:50 ` [PATCH v3 1/6] crypto: hisilicon/qm: Move the QM header to include/linux Shameer Kolothum
2021-09-15 12:49 ` Jason Gunthorpe
2021-09-15 9:50 ` [PATCH v3 2/6] crypto: hisilicon/qm: Move few definitions to common header Shameer Kolothum
2021-09-15 9:50 ` [PATCH v3 3/6] hisi_acc_qm: Move PCI device IDs " Shameer Kolothum
2021-09-22 15:11 ` Max Gurtovoy
2021-09-24 8:18 ` Shameerali Kolothum Thodi
2021-09-15 9:50 ` [PATCH v3 4/6] hisi-acc-vfio-pci: add new vfio_pci driver for HiSilicon ACC devices Shameer Kolothum
2021-09-15 12:51 ` Jason Gunthorpe
2021-09-15 13:35 ` Shameerali Kolothum Thodi
2021-09-15 9:50 ` [PATCH v3 5/6] hisi_acc_vfio_pci: Restrict access to VF dev BAR2 migration region Shameer Kolothum
2021-09-15 9:50 ` [PATCH v3 6/6] hisi_acc_vfio_pci: Add support for VFIO live migration Shameer Kolothum
2021-09-15 13:07 ` Jason Gunthorpe
2021-09-15 13:28 ` Shameerali Kolothum Thodi
2021-09-16 13:58 ` Jason Gunthorpe
2021-09-27 13:46 ` Shameerali Kolothum Thodi
2021-09-27 15:01 ` Jason Gunthorpe
2021-09-27 15:27 ` Shameerali Kolothum Thodi
2021-09-27 16:00 ` Leon Romanovsky
2021-09-27 16:06 ` Jason Gunthorpe
2021-09-27 18:17 ` Leon Romanovsky
2021-09-27 18:22 ` Jason Gunthorpe
2021-09-27 18:30 ` Leon Romanovsky
2021-09-27 18:32 ` Jason Gunthorpe
2021-09-29 3:57 ` [PATCH v3 0/6] vfio/hisilicon: add acc live migration driver Tian, Kevin
2021-09-29 8:34 ` Shameerali Kolothum Thodi
2021-09-29 9:05 ` Tian, Kevin [this message]
2021-09-29 9:16 ` Shameerali Kolothum Thodi
2021-09-30 0:42 ` Tian, Kevin
2021-09-30 6:34 ` Shameerali Kolothum Thodi
2021-10-15 5:53 ` Tian, Kevin
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