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[Xen-bugs] [Bug 1106] New: HVM won't boot from 250GB virtual disk image,

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Subject: [Xen-bugs] [Bug 1106] New: HVM won't boot from 250GB virtual disk image, but Ok at 96GB.
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Date: Fri, 9 Nov 2007 08:40:18 -0800
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           Summary: HVM won't boot from 250GB virtual disk image, but Ok at
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux-2.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: xensource@xxxxxxxxxxxxxxxx

Note:  This is with xen-3.1.0, but I couldn't find a choice for that in the
Version drop-down in bugzilla.

Attempting to boot a WinXP-MediaCenter Edition DomU from a virtual disk of
around 250GB fails.  The BIOS message that appears briefly in the SDL window
says that the disk size is -6GB (minus six GB!), and the domU crashes.  This is
with a 250GB image that is known good, i.e. boots on the bare-metal just fine. 
Almost all of the 250G is in one big, bootable NTFS partition.

If you resize the virtual disk and it's windows partition to 96GB (using parted
or similar tool), it boots just fine.  In this case the BIOS reports the disk
size correctly.

I suspect that this is a BIOS limitation in the BIOS provided to boot the HVM
DomUs.  Large virtual disks appear to be fully accessible otherwise, just not
properly bootable, which is why I suspect the BIOS.  The -6GB size report makes
me think that disk size is being caluclated with signed arithmetic, and sizes
over 128GB wrap around to negative numbers.

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