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From: Cornelia Huck <cohuck@redhat.com>
To: Kirti Wankhede <kwankhede@nvidia.com>
Cc: cjia@nvidia.com, aik@ozlabs.ru, Zhengxiao.zx@alibaba-inc.com,
	shuangtai.tst@alibaba-inc.com, qemu-devel@nongnu.org,
	peterx@redhat.com, eauger@redhat.com, yi.l.liu@intel.com,
	quintela@redhat.com, ziye.yang@intel.com, armbru@redhat.com,
	mlevitsk@redhat.com, pasic@linux.ibm.com, felipe@nutanix.com,
	zhi.a.wang@intel.com, kevin.tian@intel.com, yan.y.zhao@intel.com,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	alex.williamson@redhat.com, changpeng.liu@intel.com,
	eskultet@redhat.com, Ken.Xue@amd.com,
	jonathan.davies@nutanix.com, pbonzini@redhat.com
Subject: Re: [PATCH v26 05/17] vfio: Add VM state change handler to know state of VM
Date: Thu, 22 Oct 2020 17:49:24 +0200	[thread overview]
Message-ID: <20201022174924.418bb30b.cohuck@redhat.com> (raw)
In-Reply-To: <39a59eb5-9a22-4f66-531c-489de9ecdf52@nvidia.com>

On Thu, 22 Oct 2020 21:12:58 +0530
Kirti Wankhede <kwankhede@nvidia.com> wrote:

> On 10/22/2020 1:21 PM, Cornelia Huck wrote:

> > I'm a bit worried though that all that reasoning which flags are set or
> > cleared when is quite complex, and it's easy to make mistakes.
> > 
> > Can we model this as a FSM, where an event (running state changes)
> > transitions the device state from one state to another? I (personally)
> > find FSMs easier to comprehend, but I'm not sure whether that change
> > would be too invasive. If others can parse the state changes with that
> > mask/value interface, I won't object to it.
> >   
> 
> I agree FSM will be easy and for long term may be easy to maintain. But 
> at this moment it will be intrusive change. For now we can go ahead with 
> this code and later we can change to FSM model, if all agrees on it.

Yes, we can certainly revisit this later.



  reply	other threads:[~2020-10-22 15:51 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-22 23:24 [PATCH QEMU v25 00/17] Add migration support for VFIO devices Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 01/17] vfio: Add function to unmap VFIO region Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 02/17] vfio: Add vfio_get_object callback to VFIODeviceOps Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 03/17] vfio: Add save and load functions for VFIO PCI devices Kirti Wankhede
2020-09-23  6:38   ` Zenghui Yu
2020-09-24 22:49   ` Alex Williamson
2020-10-21  9:30     ` Zenghui Yu
2020-10-21 19:03       ` Alex Williamson
2020-09-22 23:24 ` [PATCH v26 04/17] vfio: Add migration region initialization and finalize function Kirti Wankhede
2020-09-24 14:08   ` Cornelia Huck
2020-10-17 20:14     ` Kirti Wankhede
2020-09-25 20:20   ` Alex Williamson
2020-09-28  9:39     ` Cornelia Huck
2020-10-17 20:17     ` Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 05/17] vfio: Add VM state change handler to know state of VM Kirti Wankhede
2020-09-24 15:02   ` Cornelia Huck
2020-09-29 11:03     ` Dr. David Alan Gilbert
2020-10-17 20:24       ` Kirti Wankhede
2020-10-20 10:51         ` Cornelia Huck
2020-10-21  5:33           ` Kirti Wankhede
2020-10-22  7:51             ` Cornelia Huck
2020-10-22 15:42               ` Kirti Wankhede
2020-10-22 15:49                 ` Cornelia Huck [this message]
2020-09-25 20:20   ` Alex Williamson
2020-10-17 20:30     ` Kirti Wankhede
2020-10-17 23:44       ` Alex Williamson
2020-10-18 17:43         ` Kirti Wankhede
2020-10-19 17:51           ` Alex Williamson
2020-10-20 10:23             ` Cornelia Huck
2020-09-22 23:24 ` [PATCH v26 06/17] vfio: Add migration state change notifier Kirti Wankhede
2020-09-25 20:20   ` Alex Williamson
2020-10-17 20:35     ` Kirti Wankhede
2020-10-19 17:57       ` Alex Williamson
2020-10-20 10:55         ` Cornelia Huck
2020-09-22 23:24 ` [PATCH v26 07/17] vfio: Register SaveVMHandlers for VFIO device Kirti Wankhede
2020-09-24 15:15   ` Philippe Mathieu-Daudé
2020-09-29 10:19     ` Dr. David Alan Gilbert
2020-10-17 20:36       ` Kirti Wankhede
2020-09-25 11:53   ` Cornelia Huck
2020-10-18 20:55     ` Kirti Wankhede
2020-10-20 15:51       ` Cornelia Huck
2020-09-25 20:20   ` Alex Williamson
2020-10-18 17:40     ` Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 08/17] vfio: Add save state functions to SaveVMHandlers Kirti Wankhede
2020-09-23 11:42   ` Wang, Zhi A
2020-10-21 14:30     ` Kirti Wankhede
2020-09-25 21:02   ` Alex Williamson
2020-10-18 18:00     ` Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 09/17] vfio: Add load " Kirti Wankhede
2020-10-01 10:07   ` Cornelia Huck
2020-10-18 20:47     ` Kirti Wankhede
2020-10-20 16:25       ` Cornelia Huck
2020-09-22 23:24 ` [PATCH v26 10/17] memory: Set DIRTY_MEMORY_MIGRATION when IOMMU is enabled Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 11/17] vfio: Get migration capability flags for container Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 12/17] vfio: Add function to start and stop dirty pages tracking Kirti Wankhede
2020-09-25 21:55   ` Alex Williamson
2020-10-18 20:52     ` Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 13/17] vfio: create mapped iova list when vIOMMU is enabled Kirti Wankhede
2020-09-25 22:23   ` Alex Williamson
2020-10-19  6:01     ` Kirti Wankhede
2020-10-19 17:24       ` Alex Williamson
2020-10-19 19:15         ` Kirti Wankhede
2020-10-19 20:07           ` Alex Williamson
2020-09-22 23:24 ` [PATCH v26 14/17] vfio: Add vfio_listener_log_sync to mark dirty pages Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 15/17] vfio: Add ioctl to get dirty pages bitmap during dma unmap Kirti Wankhede
2020-09-22 23:24 ` [PATCH v26 16/17] vfio: Make vfio-pci device migration capable Kirti Wankhede
2020-09-25 12:17   ` Cornelia Huck
2020-09-22 23:24 ` [PATCH v26 17/17] qapi: Add VFIO devices migration stats in Migration stats Kirti Wankhede
2020-09-24 15:14   ` Eric Blake
2020-09-25 22:55   ` Alex Williamson
2020-09-29 10:40   ` Dr. David Alan Gilbert
2020-09-23  7:06 ` [PATCH QEMU v25 00/17] Add migration support for VFIO devices Zenghui Yu

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