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Re: [Xen-devel] blkfront/back and sector size of 2048 with CDROM's
| To: | James Harper <james.harper@xxxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] blkfront/back and sector size of 2048 with CDROM's |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Tue, 05 Feb 2008 08:30:43 +0000 |
| Delivery-date: | Tue, 05 Feb 2008 00:31:19 -0800 |
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| Thread-topic: | [Xen-devel] blkfront/back and sector size of 2048 with CDROM's |
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On 5/2/08 00:09, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote: > It looks like mounting a physical CDROM under the windows gpl pv drivers > doesn't work, and I suspect that the problem is because the CDROM uses a > sector size of 2048 instead of 512. > > Do the pages passed between the front and backend scale to using > different sector sizes, or do I have to do some magic to fudge them back > to 512? The 'sectors' referenced in blkif requests are always 512 bytes. So if you read 'sector-size' of 2048 from xenstore during blkif setup, that means that the #sector alignments and sizes you send in requests must be multiples of 4. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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