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Re: [Qemu-devel] Design of the blobstore

From: Stefan Berger
Subject: Re: [Qemu-devel] Design of the blobstore
Date: Thu, 15 Sep 2011 06:18:35 -0400
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On 09/15/2011 01:47 AM, Gleb Natapov wrote:
On Wed, Sep 14, 2011 at 01:05:44PM -0400, Stefan Berger wrote:
   One property of the blobstore is that it has a certain required
size for accommodating all blobs of device that want to store their
blobs onto. The assumption is that the size of these blobs is know
a-priori to the writer of the device code and all devices can
register their space requirements with the blobstore during device
initialization. Then gathering all the registered blobs' sizes plus
knowing the overhead of the layout of the data on the disk lets QEMU
calculate the total required (minimum) size that the image has to
have to accommodate all blobs in a particular blobstore.

I do not see the point of having one blobstore for all devices. Each
should have its own. We will need permanent storage for UEFI firmware
too and creating new UEFI config for each machine configuration is not
the kind of usability we want to have.

You will have the possibility of storing all devices' state into one blobstore or each devices' state in its own or any combination in between.


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