[Xen-devel] Bios virtulise in DomU

["Amit Singh" <amit.singh@xxxxxxxxxxx>]

 Hello all xen-developers,

   I have a query regarding "HOW BIOS VIRTUALISE IN DOMU" in case of paravirtualisation
or full virtualisation. Actually the doubts comes when i read the code of blkback.c
i write the code below...

         
                while ((bio == NULL) ||
                       (bio_add_page(bio,
                                     virt_to_page(vaddr(pending_req, i)),
                                     seg[i].nsec << 9,
                                     seg[i].buf & ~PAGE_MASK) == 0)) {
                        bio = biolist[nbio++] = bio_alloc(GFP_KERNEL, nseg-i);
                        if (unlikely(bio == NULL))
                                goto fail_put_bio;

                        bio->bi_bdev    = preq.bdev;
                        bio->bi_private = pending_req;
                        bio->bi_end_io  = end_block_io_op;
                        bio->bi_sector  = preq.sector_number;
                }
pls if anyone can explain, pls mail me.

e-mailid:amit.singh@xxxxxxxxxxx

With regards:
AMIT KR. SINGH

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