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Miller" , Jakub Kicinski , "Kirti Wankhede" , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "netdev@vger.kernel.org" , Saeed Mahameed , liulongfang References: <42729adc4df649f7b3ce5dc95e66e2dc@huawei.com> <60989aa8-4231-0cdf-47bb-1e2026bd1f17@nvidia.com> <164439bb579d41639edf9a01a538a5ef@huawei.com> <078fc846-1f72-adc0-339c-1b638c6c6e33@nvidia.com> <85743eabdae04d08bb5eba7b6857496e@huawei.com> From: Max Gurtovoy Message-ID: Date: Mon, 27 Sep 2021 21:24:19 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <85743eabdae04d08bb5eba7b6857496e@huawei.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Originating-IP: [172.20.187.5] X-ClientProxiedBy: HQMAIL107.nvidia.com (172.20.187.13) To DRHQMAIL107.nvidia.com (10.27.9.16) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 3fa588d8-2668-4158-d30e-08d981e40af1 X-MS-TrafficTypeDiagnostic: MN2PR12MB3181: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.36;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid05.nvidia.com;CAT:NONE;SFS:(4636009)(36840700001)(46966006)(110136005)(508600001)(8676002)(336012)(54906003)(70586007)(70206006)(2616005)(86362001)(36756003)(6666004)(16576012)(426003)(316002)(36906005)(31696002)(7636003)(356005)(31686004)(5660300002)(8936002)(186003)(53546011)(4326008)(82310400003)(16526019)(26005)(47076005)(7416002)(2906002)(83380400001)(36860700001)(43740500002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Sep 2021 18:24:28.3534 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3fa588d8-2668-4158-d30e-08d981e40af1 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.36];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT049.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3181 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/26/2021 7:17 PM, Shameerali Kolothum Thodi wrote: > >> -----Original Message----- >> From: Max Gurtovoy [mailto:mgurtovoy@nvidia.com] >> Sent: 26 September 2021 10:10 >> To: Shameerali Kolothum Thodi ; >> Leon Romanovsky >> Cc: Doug Ledford ; Jason Gunthorpe >> ; Yishai Hadas ; Alex Williamson >> ; Bjorn Helgaas ; David >> S. Miller ; Jakub Kicinski ; Kirti >> Wankhede ; kvm@vger.kernel.org; >> linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; >> linux-rdma@vger.kernel.org; netdev@vger.kernel.org; Saeed Mahameed >> ; liulongfang >> Subject: Re: [PATCH mlx5-next 2/7] vfio: Add an API to check migration state >> transition validity >> >> >> On 9/24/2021 10:44 AM, Shameerali Kolothum Thodi wrote: >>>> -----Original Message----- >>>> From: Max Gurtovoy [mailto:mgurtovoy@nvidia.com] >>>> Sent: 23 September 2021 14:56 >>>> To: Leon Romanovsky ; Shameerali Kolothum Thodi >>>> >>>> Cc: Doug Ledford ; Jason Gunthorpe >>>> ; Yishai Hadas ; Alex Williamson >>>> ; Bjorn Helgaas ; >>>> David S. Miller ; Jakub Kicinski >>>> ; Kirti Wankhede ; >>>> kvm@vger.kernel.org; linux-kernel@vger.kernel.org; >>>> linux-pci@vger.kernel.org; linux-rdma@vger.kernel.org; >>>> netdev@vger.kernel.org; Saeed Mahameed >>>> Subject: Re: [PATCH mlx5-next 2/7] vfio: Add an API to check >>>> migration state transition validity >>>> >>>> >>>> On 9/23/2021 2:17 PM, Leon Romanovsky wrote: >>>>> On Thu, Sep 23, 2021 at 10:33:10AM +0000, Shameerali Kolothum Thodi >>>> wrote: >>>>>>> -----Original Message----- >>>>>>> From: Leon Romanovsky [mailto:leon@kernel.org] >>>>>>> Sent: 22 September 2021 11:39 >>>>>>> To: Doug Ledford ; Jason Gunthorpe >>>> >>>>>>> Cc: Yishai Hadas ; Alex Williamson >>>>>>> ; Bjorn Helgaas ; >>>> David >>>>>>> S. Miller ; Jakub Kicinski ; >>>>>>> Kirti Wankhede ; kvm@vger.kernel.org; >>>>>>> linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; >>>>>>> linux-rdma@vger.kernel.org; netdev@vger.kernel.org; Saeed Mahameed >>>>>>> >>>>>>> Subject: [PATCH mlx5-next 2/7] vfio: Add an API to check migration >>>>>>> state transition validity >>>>>>> >>>>>>> From: Yishai Hadas >>>>>>> >>>>>>> Add an API in the core layer to check migration state transition >>>>>>> validity as part of a migration flow. >>>>>>> >>>>>>> The valid transitions follow the expected usage as described in >>>>>>> uapi/vfio.h and triggered by QEMU. >>>>>>> >>>>>>> This ensures that all migration implementations follow a >>>>>>> consistent migration state machine. >>>>>>> >>>>>>> Signed-off-by: Yishai Hadas >>>>>>> Reviewed-by: Kirti Wankhede >>>>>>> Signed-off-by: Jason Gunthorpe >>>>>>> Signed-off-by: Leon Romanovsky >>>>>>> --- >>>>>>> drivers/vfio/vfio.c | 41 >>>> +++++++++++++++++++++++++++++++++++++++++ >>>>>>> include/linux/vfio.h | 1 + >>>>>>> 2 files changed, 42 insertions(+) >>>>>>> >>>>>>> diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index >>>>>>> 3c034fe14ccb..c3ca33e513c8 100644 >>>>>>> --- a/drivers/vfio/vfio.c >>>>>>> +++ b/drivers/vfio/vfio.c >>>>>>> @@ -1664,6 +1664,47 @@ static int vfio_device_fops_release(struct >>>> inode >>>>>>> *inode, struct file *filep) >>>>>>> return 0; >>>>>>> } >>>>>>> >>>>>>> +/** >>>>>>> + * vfio_change_migration_state_allowed - Checks whether a >>>>>>> +migration >>>> state >>>>>>> + * transition is valid. >>>>>>> + * @new_state: The new state to move to. >>>>>>> + * @old_state: The old state. >>>>>>> + * Return: true if the transition is valid. >>>>>>> + */ >>>>>>> +bool vfio_change_migration_state_allowed(u32 new_state, u32 >>>> old_state) >>>>>>> +{ >>>>>>> + enum { MAX_STATE = VFIO_DEVICE_STATE_RESUMING }; >>>>>>> + static const u8 vfio_from_state_table[MAX_STATE + 1][MAX_STATE + >>>> 1] = { >>>>>>> + [VFIO_DEVICE_STATE_STOP] = { >>>>>>> + [VFIO_DEVICE_STATE_RUNNING] = 1, >>>>>>> + [VFIO_DEVICE_STATE_RESUMING] = 1, >>>>>>> + }, >>>>>>> + [VFIO_DEVICE_STATE_RUNNING] = { >>>>>>> + [VFIO_DEVICE_STATE_STOP] = 1, >>>>>>> + [VFIO_DEVICE_STATE_SAVING] = 1, >>>>>>> + [VFIO_DEVICE_STATE_SAVING | >>>> VFIO_DEVICE_STATE_RUNNING] >>>>>>> = 1, >>>>>> Do we need to allow _RESUMING state here or not? As per the "State >>>> transitions" >>>>>> section from uapi/linux/vfio.h, >>>>> It looks like we missed this state transition. >>>>> >>>>> Thanks >>>> I'm not sure this state transition is valid. >>>> >>>> Kirti, When we would like to move from RUNNING to RESUMING ? >>> I guess it depends on what you report as your dev default state. >>> >>> For HiSilicon ACC migration driver, we set the default to _RUNNING. >> Where do you set it and report it ? > Currently, in _open_device() we set the device_state to _RUNNING. Why do you do it ? > > I think in your case the default of vmig->vfio_dev_state == 0 (_STOP). > >>> And when the migration starts, the destination side Qemu, set the >>> device state to _RESUMING(vfio_load_state()). >>> >>> From the documentation, it looks like the assumption on default state >>> of the VFIO dev is _RUNNING. >>> >>> " >>> * 001b => Device running, which is the default state " >>> >>>> Sameerali, can you please re-test and update if you see this transition ? >>> Yes. And if I change the default state to _STOP, then the transition >>> is from _STOP --> _RESUMING. >>> >>> But the documentation on State transitions doesn't have _STOP --> >>> _RESUMING transition as valid. >>> >>> Thanks, >>> Shameer >>> >>>>>> " * 4. To start the resuming phase, the device state should be >>>>>> transitioned >>>> from >>>>>> * the _RUNNING to the _RESUMING state." >>>>>> >>>>>> IIRC, I have seen that transition happening on the destination dev >>>>>> while >>>> testing the >>>>>> HiSilicon ACC dev migration. >>>>>> >>>>>> Thanks, >>>>>> Shameer >>>>>> >>>>>>> + }, >>>>>>> + [VFIO_DEVICE_STATE_SAVING] = { >>>>>>> + [VFIO_DEVICE_STATE_STOP] = 1, >>>>>>> + [VFIO_DEVICE_STATE_RUNNING] = 1, >>>>>>> + }, >>>>>>> + [VFIO_DEVICE_STATE_SAVING | VFIO_DEVICE_STATE_RUNNING] >>>> = { >>>>>>> + [VFIO_DEVICE_STATE_RUNNING] = 1, >>>>>>> + [VFIO_DEVICE_STATE_SAVING] = 1, >>>>>>> + }, >>>>>>> + [VFIO_DEVICE_STATE_RESUMING] = { >>>>>>> + [VFIO_DEVICE_STATE_RUNNING] = 1, >>>>>>> + [VFIO_DEVICE_STATE_STOP] = 1, >>>>>>> + }, >>>>>>> + }; >>>>>>> + >>>>>>> + if (new_state > MAX_STATE || old_state > MAX_STATE) >>>>>>> + return false; >>>>>>> + >>>>>>> + return vfio_from_state_table[old_state][new_state]; >>>>>>> +} >>>>>>> +EXPORT_SYMBOL_GPL(vfio_change_migration_state_allowed); >>>>>>> + >>>>>>> static long vfio_device_fops_unl_ioctl(struct file *filep, >>>>>>> unsigned int cmd, unsigned long arg) >>>>>>> { >>>>>>> diff --git a/include/linux/vfio.h b/include/linux/vfio.h index >>>>>>> b53a9557884a..e65137a708f1 100644 >>>>>>> --- a/include/linux/vfio.h >>>>>>> +++ b/include/linux/vfio.h >>>>>>> @@ -83,6 +83,7 @@ extern struct vfio_device >>>>>>> *vfio_device_get_from_dev(struct device *dev); >>>>>>> extern void vfio_device_put(struct vfio_device *device); >>>>>>> >>>>>>> int vfio_assign_device_set(struct vfio_device *device, void >>>>>>> *set_id); >>>>>>> +bool vfio_change_migration_state_allowed(u32 new_state, u32 >>>> old_state); >>>>>>> /* events for the backend driver notify callback */ >>>>>>> enum vfio_iommu_notify_type { >>>>>>> -- >>>>>>> 2.31.1