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[Xen-devel] Bios virtulise in DomU


  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Amit Singh" <amit.singh@xxxxxxxxxxx>
  • Date: Mon, 24 Sep 2007 11:37:12 +0530
  • Delivery-date: Mon, 24 Sep 2007 09:42:17 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acf+cSXZ1DwKNVMrSoqd/QfSr53bVQ==
  • Thread-topic: Bios virtulise in DomU


 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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