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Date: Tue, 15 Mar 2022 12:26:25 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
Cc: <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-crypto@...r.kernel.org>, <linux-pci@...r.kernel.org>,
<jgg@...dia.com>, <cohuck@...hat.com>, <mgurtovoy@...dia.com>,
<yishaih@...dia.com>, <kevin.tian@...el.com>,
<linuxarm@...wei.com>, <liulongfang@...wei.com>,
<prime.zeng@...ilicon.com>, <jonathan.cameron@...wei.com>,
<wangzhou1@...ilicon.com>
Subject: Re: [PATCH v9 0/9] vfio/hisilicon: add ACC live migration driver
On Tue, 8 Mar 2022 18:48:53 +0000
Shameer Kolothum <shameerali.kolothum.thodi@...wei.com> wrote:
> Hi,
>
> This series attempts to add vfio live migration support for HiSilicon
> ACC VF devices based on the new v2 migration protocol definition and
> mlx5 v9 series discussed here[0].
>
> v8 --> v9
> - Added acks by Wangzhou/Longfang/Yekai
> - Added R-by tags by Jason.
> - Addressed comments by Alex on v8.
> - Fixed the pf_queue pointer assignment error in patch #8.
> - Addressed comments from Kevin,
> -Updated patch #5 commit log msg with a clarification that VF
> migration BAR assignment is fine if migration support is not there.
> -Added QM description to patch #8 commit msg.
>
> This is sanity tested on a HiSilicon platform using the Qemu branch
> provided here[1].
>
> Please take a look and let me know your feedback.
>
> Thanks,
> Shameer
> [0] https://lore.kernel.org/kvm/20220224142024.147653-1-yishaih@nvidia.com/
> [1] https://github.com/jgunthorpe/qemu/commits/vfio_migration_v2
>
> v7 --> v8
> - Dropped PRE_COPY support and early compatibility checking based on
> the discussion here[1].
> - Addressed comments from John, Jason & Alex (Thanks!).
>
> v6 --> v7
> -Renamed MIG_PRECOPY ioctl name and struct name. Updated ioctl descriptions
> regarding ioctl validity (patch #7).
> - Adressed comments from Jason and Alex on PRE_COPY read() and ioctl() fns
> (patch #9).
> - Moved only VF PCI ids to pci_ids.h(patch #3).
>
> v5 --> v6
> -Report PRE_COPY support and use that for early compatibility check
> between src and dst devices.
> -For generic PRE_COPY support, included patch #7 from Jason(Thanks!).
> -Addressed comments from Alex(Thanks!).
> -Added the QM state register update to QM driver(patch #8) since that
> is being used in migration driver to decide whether the device is
> ready to save the state.
>
> RFCv4 --> v5
> - Dropped RFC tag as v2 migration APIs are more stable now.
> - Addressed review comments from Jason and Alex (Thanks!).
>
> v3 --> RFCv4
> -Based on migration v2 protocol and mlx5 v7 series.
> -Added RFC tag again as migration v2 protocol is still under discussion.
> -Added new patch #6 to retrieve the PF QM data.
> -PRE_COPY compatibility check is now done after the migration data
> transfer. This is not ideal and needs discussion.
>
> RFC v2 --> v3
> -Dropped RFC tag as the vfio_pci_core subsystem framework is now
> part of 5.15-rc1.
> -Added override methods for vfio_device_ops read/write/mmap calls
> to limit the access within the functional register space.
> -Patches 1 to 3 are code refactoring to move the common ACC QM
> definitions and header around.
>
> RFCv1 --> RFCv2
>
> -Adds a new vendor-specific vfio_pci driver(hisi-acc-vfio-pci)
> for HiSilicon ACC VF devices based on the new vfio-pci-core
> framework proposal.
>
> -Since HiSilicon ACC VF device MMIO space contains both the
> functional register space and migration control register space,
> override the vfio_device_ops ioctl method to report only the
> functional space to VMs.
>
> -For a successful migration, we still need access to VF dev
> functional register space mainly to read the status registers.
> But accessing these while the Guest vCPUs are running may leave
> a security hole. To avoid any potential security issues, we
> map/unmap the MMIO regions on a need basis and is safe to do so.
> (Please see hisi_acc_vf_ioremap/unmap() fns in patch #4).
>
> -Dropped debugfs support for now.
> -Uses common QM functions for mailbox access(patch #3).
>
> Longfang Liu (3):
> crypto: hisilicon/qm: Move few definitions to common header
> crypto: hisilicon/qm: Set the VF QM state register
> hisi_acc_vfio_pci: Add support for VFIO live migration
>
> Shameer Kolothum (6):
> crypto: hisilicon/qm: Move the QM header to include/linux
> hisi_acc_qm: Move VF PCI device IDs to common header
> hisi_acc_vfio_pci: add new vfio_pci driver for HiSilicon ACC devices
> hisi_acc_vfio_pci: Restrict access to VF dev BAR2 migration region
> hisi_acc_vfio_pci: Add helper to retrieve the struct pci_driver
> hisi_acc_vfio_pci: Use its own PCI reset_done error handler
>
> MAINTAINERS | 7 +
> drivers/crypto/hisilicon/hpre/hpre.h | 2 +-
> drivers/crypto/hisilicon/hpre/hpre_main.c | 19 +-
> drivers/crypto/hisilicon/qm.c | 68 +-
> drivers/crypto/hisilicon/sec2/sec.h | 2 +-
> drivers/crypto/hisilicon/sec2/sec_main.c | 21 +-
> drivers/crypto/hisilicon/sgl.c | 2 +-
> drivers/crypto/hisilicon/zip/zip.h | 2 +-
> drivers/crypto/hisilicon/zip/zip_main.c | 17 +-
> drivers/vfio/pci/Kconfig | 2 +
> drivers/vfio/pci/Makefile | 2 +
> drivers/vfio/pci/hisilicon/Kconfig | 15 +
> drivers/vfio/pci/hisilicon/Makefile | 4 +
> .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 1326 +++++++++++++++++
> .../vfio/pci/hisilicon/hisi_acc_vfio_pci.h | 116 ++
> .../qm.h => include/linux/hisi_acc_qm.h | 49 +
> include/linux/pci_ids.h | 3 +
> 17 files changed, 1591 insertions(+), 66 deletions(-)
> create mode 100644 drivers/vfio/pci/hisilicon/Kconfig
> create mode 100644 drivers/vfio/pci/hisilicon/Makefile
> create mode 100644 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> create mode 100644 drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
> rename drivers/crypto/hisilicon/qm.h => include/linux/hisi_acc_qm.h (87%)
>
Applied to vfio next branch for v5.18 with reviews/acks from Kevin and
Bjorn. Thanks,
Alex
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