Xen devel - May 2009 - [PATCH 0 of 2] stubdoms and sector size > 512

Hi all,
currently stubdoms do not work with physical cdrom drives because they
usually have disk sectors of 2048 bytes, that are not supported
correctly by blkfront and block-vbd.
The first patch fixes blkfront handling of sector sizes greater than
512, while the second patch fixes block-vbd to bounce any read or write
request with a buffer not aligned, a sector number not aligned or an
offset not aligned according to the sector size reported by blkfront.

With these two patches applied, you should be able to use for example
''phy:/dev/cdrom,hdc:cdrom,r'' in the disk configuration of the
vm.
However there is still an issue trying to start a stubdom based guest
with a configuration of this kind, if no cdroms are actually present in
the drive. A patch to fix that issue will come shortly.

Cheers,

Stefano Stabellini

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