RE: [Xen-users] Inter-VM Shared memory with HVM DomUs

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> From: Todd Deshane [mailto:todd.deshane@xxxxxxx]
> Sent: Monday, August 29, 2011 7:17 PM
> To: Anil Rao
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx; Dan Magenheimer
> Subject: Re: [Xen-users] Inter-VM Shared memory with HVM DomUs
> 
> On Mon, Aug 29, 2011 at 7:59 PM, Anil Rao <anil.rao@xxxxxxxxxxxx> wrote:
> > Hello,
> >
> > I am interested in having a bunch of HVM DomUs share a memory segment that
> > is exported by Dom0. I am currently on a Xen 4.1.0 system with the Jeremy
> > PV-OPTs Dom0. For my initial test, my DomU kernel is running a 32-bit PAE
> > kernel based on Fedora 15. I configured the PV options to turn on the Xen
> > Platform Drivers (configured as modules). When I start the DomU, it cannot
> > find the root and swap partitions and then falls into a debug shell.
> >
> > The Standard Fedora 15 32-bit kernel (with no PV options configured) works
> > fine as a HVM DomU on my host. Is there a special recipe that I must follow
> > to get PV-on-HVM working? From reading various posts it appears that
> > PV-on-HVM is required in order to get inter-VM shared memory to work with
> > HVM DomUs. Any thoughts/suggestions would be most appreciated.
> >
> 
> Take a look here:
> http://oss.oracle.com/projects/tmem/
> 
> I've also added Dan to the CC he may have some insights.
> 
> As he has submitted tmem patches for upstream Linux:
> http://xen.markmail.org/search/?q=tmem#query:tmem%20from%3A%22Dan%20Magenheimer%22%20date%3A201107%20+
> page:1+mid:jvln4hk5agf5onzz+state:results

Anil, as you may have noticed from the above link, Transcendent
Memory ("tmem") is really for sharing memory _capacity_ between
guests not the actual data in memory.  So I am guessing tmem
will not be useful to you, but if I am wrong, please let me know.

Todd, thanks anyway!

Dan

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