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From: Jason Wang <jasowang@redhat.com>
To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: "Elena Ufimtseva" <elena.ufimtseva@oracle.com>,
	"Janosch Frank" <frankja@linux.vnet.ibm.com>,
	"mst@redhat.com" <mtsirkin@redhat.com>,
	"John G Johnson" <john.g.johnson@oracle.com>,
	qemu-devel <qemu-devel@nongnu.org>,
	"Kirti Wankhede" <kwankhede@nvidia.com>,
	"Gerd Hoffmann" <kraxel@redhat.com>,
	"Yan Vugenfirer" <yan@daynix.com>,
	"Jag Raman" <jag.raman@oracle.com>,
	"Christian Borntraeger" <borntraeger@de.ibm.com>,
	"Anup Patel" <anup@brainfault.org>,
	"Claudio Imbrenda" <imbrenda@linux.vnet.ibm.com>,
	"Eugenio Pérez" <eperezma@redhat.com>,
	"Roman Kagan" <rkagan@virtuozzo.com>,
	"Felipe Franciosi" <felipe@nutanix.com>,
	"Marc-André Lureau" <marcandre.lureau@redhat.com>,
	"Jens Freimann" <jfreimann@redhat.com>,
	"Philippe Mathieu-Daudé" <philmd@redhat.com>,
	"Stefano Garzarella" <sgarzare@redhat.com>,
	"Eduardo Habkost" <ehabkost@redhat.com>,
	"Sergio Lopez" <slp@redhat.com>,
	"Kashyap Chamarthy" <kchamart@redhat.com>,
	"Darren Kenny" <darren.kenny@oracle.com>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"Liran Alon" <liran.alon@oracle.com>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"David Gibson" <david@gibson.dropbear.id.au>,
	"Kevin Wolf" <kwolf@redhat.com>,
	"Halil Pasic" <pasic@linux.vnet.ibm.com>,
	"Daniel P. Berrange" <berrange@redhat.com>,
	"Christophe de Dinechin" <dinechin@redhat.com>,
	"Thanos Makatos" <thanos.makatos@nutanix.com>,
	fam <fam@euphon.net>
Subject: Re: Out-of-Process Device Emulation session at KVM Forum 2020
Date: Mon, 2 Nov 2020 11:00:12 +0800	[thread overview]
Message-ID: <0cabda60-f10d-fb74-f3eb-d21be7db7334@redhat.com> (raw)
In-Reply-To: <CAJSP0QXQmFgtSsJL1B3eMUr8teQc3cvvEFvr7LvnFkJPcE3ZpA@mail.gmail.com>


On 2020/10/30 下午7:13, Stefan Hajnoczi wrote:
>> I still don't get why it must be opaque.
> If the device state format needs to be in the VMM then each device
> needs explicit enablement in each VMM (QEMU, cloud-hypervisor, etc).
>
> Let's invert the question: why does the VMM need to understand the
> device state of a_passthrough_  device?


It's not a 100% passthrough device if you want to support live 
migration. E.g the device state save and restore is not under the 
control of drivers in the guest.

And if I understand correctly, it usually requires device emulation or 
mediation in either userspace or kernel to support e.g dirty page 
tracking and other things.

Thanks



  parent reply	other threads:[~2020-11-02  3:02 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-27 15:14 Out-of-Process Device Emulation session at KVM Forum 2020 Stefan Hajnoczi
2020-10-28  9:32 ` Thanos Makatos
2020-10-28 10:07   ` Thanos Makatos
2020-10-28 11:09 ` Michael S. Tsirkin
2020-10-29  8:21 ` Stefan Hajnoczi
2020-10-29 12:08 ` Stefan Hajnoczi
2020-10-29 13:02   ` Jason Wang
2020-10-29 13:06     ` Paolo Bonzini
2020-10-29 14:08     ` Stefan Hajnoczi
2020-10-29 14:31     ` Alex Williamson
2020-10-29 15:09       ` Jason Wang
2020-10-29 15:46         ` Alex Williamson
2020-10-29 16:10           ` Paolo Bonzini
2020-10-30  1:11           ` Jason Wang
2020-10-30  3:04             ` Alex Williamson
2020-10-30  6:21               ` Stefan Hajnoczi
2020-10-30  9:45                 ` Jason Wang
2020-10-30 11:13                   ` Stefan Hajnoczi
2020-10-30 12:07                     ` Jason Wang
2020-10-30 13:15                       ` Stefan Hajnoczi
2020-11-02  2:51                         ` Jason Wang
2020-11-02 10:13                           ` Stefan Hajnoczi
2020-11-03  7:52                             ` Jason Wang
2020-11-03 14:26                               ` Stefan Hajnoczi
2020-11-04  6:50                                 ` Gerd Hoffmann
2020-11-04  7:42                                   ` Michael S. Tsirkin
2020-10-31 21:49                     ` Michael S. Tsirkin
2020-11-01  8:26                       ` Paolo Bonzini
2020-11-02  2:54                         ` Jason Wang
2020-11-02  3:00                     ` Jason Wang [this message]
2020-11-02 10:27                       ` Stefan Hajnoczi
2020-11-02 10:34                         ` Michael S. Tsirkin
2020-11-02 14:59                           ` Stefan Hajnoczi
2020-10-30  7:51               ` Michael S. Tsirkin
2020-10-30  9:31               ` Jason Wang
2020-10-29 16:15     ` David Edmondson
2020-10-29 16:42       ` Daniel P. Berrangé
2020-10-29 17:47         ` Kirti Wankhede
2020-10-29 18:07           ` Paolo Bonzini
2020-10-30  1:15             ` Jason Wang

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