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xen-devel
RE: [Xen-devel] blkfront/back and sector size of 2048 with CDROM's
> Yes, except that last_sect = 5, because it's an inclusive range.
Yes. :)
> I'm pretty sure you can DMA to/from unaligned buffers (e.g., in this
case
> non-2kB aligned). Certainly blkback doesn't appear to check for it, so
> presumably we found it works!
My buffers are always page aligned anyway. I have no control over the
buffer alignment that windows gives me, so I have to copy the data back
and forth. In a previous version I would check for buffer alignment
first (windows almost always gives you buffers aligned to a page
boundry), but the windows scsi controller interface is really messed
up... you are always called at a really high irq level, and the routines
for mapping buffers to pfn's are not available in that situation.
James
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