Couple questions

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Couple questions

Liberati, Matthew

What will be the device driver locations in future versions of xen (i.e. version 3.0)?

What will be the communications capabilities from virtual machine to virtual machine and between the virtual machine and the hypervisor?

 

I apologize if this is the wrong forum for these types of questions.

Please point me in the right direction if this is the case

 

Thanks,

Matt


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Re: Couple questions

Mark Williamson-9
>What will be the device driver locations in future versions of xen (i.e.
>version 3.0)?

In dom0, or in dedicated driver domains, as in Xen 2.0. Some more setup
code (e.g. PCI bus setup and handling) has also been moved into dom0 for
Xen 3.0 - makes it easier to stay compatible with the same hardware as
native Linux.

>What will be the communications capabilities from virtual machine to
>virtual machine and between the virtual machine and the hypervisor?

For high bandwidth transfers, shared memory communication rings and event
channels are used for interdomain communications. For low bandwidth
messaging and setup communications, a hierarchical "registry" called
xenstore is used instead of the old style "control messages". The console
will now use a separate shared memory page.

Xen <-> domain communication is via hypercalls, events (virtual IRQs) and
(occasionally) shared memory.

HTH,
Mark

>I apologize if this is the wrong forum for these types of questions.
>
>Please point me in the right direction if this is the case
>
>
>
>Thanks,
>
>Matt
>
>

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RE: Couple questions

Liberati, Matthew
In reply to this post by Liberati, Matthew
Thanks for the initial response I have a couple of follow-up questions

These questions are about the relationship between the virtual machines

When a message is sent does the receiver know who the sender is?

How many channels are available?

What security options are available and how is spoofing or forging
prevented?

Thanks

-----Original Message-----
From: M.A. Williamson [mailto:[hidden email]] On Behalf Of M.A.
Williamson
Sent: Friday, October 07, 2005 1:23 PM
To: Liberati, Matthew
Cc: [hidden email]
Subject: Re: [Xen-users] Couple questions

>What will be the device driver locations in future versions of xen
(i.e.
>version 3.0)?

In dom0, or in dedicated driver domains, as in Xen 2.0. Some more setup
code (e.g. PCI bus setup and handling) has also been moved into dom0 for

Xen 3.0 - makes it easier to stay compatible with the same hardware as
native Linux.

>What will be the communications capabilities from virtual machine to
>virtual machine and between the virtual machine and the hypervisor?

For high bandwidth transfers, shared memory communication rings and
event
channels are used for interdomain communications. For low bandwidth
messaging and setup communications, a hierarchical "registry" called
xenstore is used instead of the old style "control messages". The
console
will now use a separate shared memory page.

Xen <-> domain communication is via hypercalls, events (virtual IRQs)
and
(occasionally) shared memory.

HTH,
Mark

>I apologize if this is the wrong forum for these types of questions.
>
>Please point me in the right direction if this is the case
>
>
>
>Thanks,
>
>Matt
>
>



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FW: Couple questions

Liberati, Matthew
In reply to this post by Liberati, Matthew
Answers to the following questions would be greatly appreciated

Thanks

-----Original Message-----
From: Liberati, Matthew
Sent: Tuesday, October 11, 2005 9:47 AM
To: '[hidden email]'
Cc: [hidden email]
Subject: RE: [Xen-users] Couple questions

Thanks for the initial response I have a couple of follow-up questions

These questions are about the relationship between the virtual machines

When a message is sent does the receiver know who the sender is?

How many channels are available?

What security options are available and how is spoofing or forging
prevented?

Thanks

-----Original Message-----
From: M.A. Williamson [mailto:[hidden email]] On Behalf Of M.A.
Williamson
Sent: Friday, October 07, 2005 1:23 PM
To: Liberati, Matthew
Cc: [hidden email]
Subject: Re: [Xen-users] Couple questions

>What will be the device driver locations in future versions of xen
(i.e.
>version 3.0)?

In dom0, or in dedicated driver domains, as in Xen 2.0. Some more setup
code (e.g. PCI bus setup and handling) has also been moved into dom0 for

Xen 3.0 - makes it easier to stay compatible with the same hardware as
native Linux.

>What will be the communications capabilities from virtual machine to
>virtual machine and between the virtual machine and the hypervisor?

For high bandwidth transfers, shared memory communication rings and
event
channels are used for interdomain communications. For low bandwidth
messaging and setup communications, a hierarchical "registry" called
xenstore is used instead of the old style "control messages". The
console
will now use a separate shared memory page.

Xen <-> domain communication is via hypercalls, events (virtual IRQs)
and
(occasionally) shared memory.

HTH,
Mark

>I apologize if this is the wrong forum for these types of questions.
>
>Please point me in the right direction if this is the case
>
>
>
>Thanks,
>
>Matt
>
>



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