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Re: [Xen-devel] address space reorganization

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] address space reorganization
From: Jacob Gorm Hansen <jacobg@xxxxxxx>
Date: Wed, 13 Apr 2005 19:18:28 -0700
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Gerd Knorr <kraxel@xxxxxxxxxxx>
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Keir Fraser wrote:

We need generally to think about how flexible we want to be in allowing migration between different machine configurations. Shoudl we require identical h/w specs, or allow differences in I/O devices, CPU and/or memory? We will already have to be careful about downgrading cpu specs when we migrate (e.g., Linux locks onto using multimedia instructions for software raid that are unavailable post-migrate).

Why not treat the functions that use special mm-instructions (like the software RAID code) as critical sections that cannot overlap with migration, and then have the guestOS re-calibrate its use of these features upon arrival?

[ insert standard plug of self-migration here :-) ]

Jacob

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