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Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device

From: Jamie Lokier
Subject: Re: [Qemu-devel] [PATCH] Inter-VM shared memory PCI device
Date: Mon, 8 Mar 2010 09:54:56 +0000
User-agent: Mutt/1.5.13 (2006-08-11)

Alexander Graf wrote:
> Or we could put in some code that tells the guest the host shm  
> architecture and only accept x86 on x86 for now. If anyone cares for  
> other combinations, they're free to implement them.
> Seriously, we're looking at an interface designed for kvm here. Let's  
> please keep it as simple and fast as possible for the actual use case,  
> not some theoretically possible ones.

The concern is that a perfectly working guest image running on kvm,
the guest being some OS or app that uses this facility (_not_ a
kvm-only guest driver), is later run on qemu on a different host, and
then mostly works except for some silent data corruption.

That is not a theoretical scenario.

Well, the bit with this driver is theoretical, obviously :-)
But not the bit about moving to a different host.

-- Jamie

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