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[Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device
From: |
Cam Macdonell |
Subject: |
[Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device |
Date: |
Tue, 11 May 2010 11:50:26 -0600 |
On Tue, May 11, 2010 at 11:05 AM, Anthony Liguori <address@hidden> wrote:
> On 05/11/2010 11:39 AM, Cam Macdonell wrote:
>>
>> Most of the people I hear from who are using my patch are using a peer
>> model to share data between applications (simulations, JVMs, etc).
>> But guest-to-host applications work as well of course.
>>
>> I think "transparent migration" can be achieved by making the
>> connected/disconnected state transparent to the application.
>>
>> When using the shared memory server, the server has to be setup anyway
>> on the new host and copying the memory region could be part of that as
>> well if the application needs the contents preserved. I don't think
>> it has to be handled by the savevm/loadvm operations. There's little
>> difference between naming one VM the master or letting the shared
>> memory server act like a master.
>>
>
> Except that to make it work with the shared memory server, you need the
> server to participate in the live migration protocol which is something I'd
> prefer to avoid at it introduces additional down time.
Fair enough, then to move to a resolution on this can we either
not support migration at this point, which leaves us free to add it
later as migration use cases become better understand. (my preference)
OR
1 - not support migration when the server is used
2 - if role=master is specified in the non-server case, then that
guest will copy the memory with it. If role=peer is specified, the
guest will use the shared memory object on the destination host as is
(possibly creating it or output an error if memory object doesn't
exist).
Cam
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, (continued)
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Anthony Liguori, 2010/05/10
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/10
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Anthony Liguori, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Anthony Liguori, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Anthony Liguori, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device,
Cam Macdonell <=
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/12
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/12
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/11
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/10
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/10
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/10
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Avi Kivity, 2010/05/12
- [Qemu-devel] Re: [PATCH v5 4/5] Inter-VM shared memory PCI device, Cam Macdonell, 2010/05/12