From: Jason Gunthorpe <jgg@nvidia.com>
To: Avihai Horon <avihaih@nvidia.com>
Cc: qemu-devel@nongnu.org,
"Alex Williamson" <alex.williamson@redhat.com>,
"Cédric Le Goater" <clg@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Joao Martins" <joao.m.martins@oracle.com>,
"Yishai Hadas" <yishaih@nvidia.com>,
"Maor Gottlieb" <maorg@nvidia.com>,
"Kirti Wankhede" <kwankhede@nvidia.com>,
"Tarun Gupta" <targupta@nvidia.com>
Subject: Re: [PATCH for-8.2 0/6] vfio/migration: Add P2P support for VFIO migration
Date: Tue, 18 Jul 2023 12:46:01 -0300 [thread overview]
Message-ID: <ZLazufgTjVliQ9mJ@nvidia.com> (raw)
In-Reply-To: <20230716081541.27900-1-avihaih@nvidia.com>
On Sun, Jul 16, 2023 at 11:15:35AM +0300, Avihai Horon wrote:
> Hi all,
>
> The first patch in this series adds a small optimization to VFIO
> migration by moving the STOP_COPY->STOP transition to
> vfio_save_cleanup(). Testing with a ConnectX-7 VFIO device showed that
> this can reduce downtime by up to 6%.
>
> The rest of the series adds P2P support for VFIO migration.
>
> VFIO migration uAPI defines an optional intermediate P2P quiescent
> state. While in the P2P quiescent state, P2P DMA transactions cannot be
> initiated by the device, but the device can respond to incoming ones.
> Additionally, all outstanding P2P transactions are guaranteed to have
> been completed by the time the device enters this state.
For clarity it is "all outstanding DMA transactions are guarenteed to
have been completed" - the device has no idea if something is P2P or
not.
> The purpose of this state is to support migration of multiple devices
> that are doing P2P transactions between themselves.
s/are/might/
Jason
next prev parent reply other threads:[~2023-07-18 15:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-16 8:15 [PATCH for-8.2 0/6] vfio/migration: Add P2P support for VFIO migration Avihai Horon
2023-07-16 8:15 ` [PATCH for-8.2 1/6] vfio/migration: Move from STOP_COPY to STOP in vfio_save_cleanup() Avihai Horon
2023-07-30 16:25 ` Cédric Le Goater
2023-07-31 6:32 ` Avihai Horon
2023-07-31 7:05 ` Cédric Le Goater
2023-07-16 8:15 ` [PATCH for-8.2 2/6] sysemu: Add pre VM state change callback Avihai Horon
2023-07-27 16:23 ` Cédric Le Goater
2023-07-30 6:31 ` Avihai Horon
2023-07-30 16:22 ` Cédric Le Goater
2023-07-16 8:15 ` [PATCH for-8.2 3/6] qdev: Add qdev_add_vm_change_state_handler_full() Avihai Horon
2023-07-16 8:15 ` [PATCH for-8.2 4/6] vfio/migration: Refactor PRE_COPY and RUNNING state checks Avihai Horon
2023-07-21 11:33 ` Cédric Le Goater
2023-07-16 8:15 ` [PATCH for-8.2 5/6] vfio/migration: Add P2P support for VFIO migration Avihai Horon
2023-07-21 11:48 ` Cédric Le Goater
2023-07-23 10:37 ` Avihai Horon
2023-07-16 8:15 ` [PATCH for-8.2 6/6] vfio/migration: Allow migration of multiple P2P supporting devices Avihai Horon
2023-07-21 12:09 ` Cédric Le Goater
2023-07-23 10:42 ` Avihai Horon
2023-07-18 15:46 ` Jason Gunthorpe [this message]
2023-07-30 6:50 ` [PATCH for-8.2 0/6] vfio/migration: Add P2P support for VFIO migration Avihai Horon
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