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Re: [Xen-users] CoW works on Windows guest?

From: "Orathai Sukwong" <kobkob@xxxxxxxxx>

Date: Fri, 29 Sep 2006 13:16:47 -0400

Cc: Ryan Grimm <grimm@xxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx

Delivery-date: Fri, 29 Sep 2006 10:17:27 -0700

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List-id: Xen user discussion <xen-users.lists.xensource.com>

You might try the latest version of the kernel module and tools that
are in the development tree:

  http://static.danplanet.com/hg/dm-userspace/

Note that you *must* rebuild the kernel module and both cowd and
dscow_plugin if you move to the newer version.  This should be easy to
do outside of your xen tree:

  # cd dm-userspace/module
  # cp dm-userspace.h /lib/modules/`uname -r`/build/include/linux
  # make
  # insmod ./dm-user.ko
  # cd../tools/cowd
  # ./autogen && ./configure --enable-internal-dmu
  # make && make install

I did all that. With this dscow_tool & cowd binaries, I still have got the same problem. However, the seg fault happens in slightly different position.

Program received signal SIGSEGV, Segmentation fault.
dscow_create (filename=0x0, base=0xbfe1099f "/xenimages/test.img",
    block_size=0) at dscow_ops.c:349
349                     handle->dirty_bitmaps[i] = 1;
(gdb) print i
$1 = 0

And i is declared in int.
--------------------------------
struct dscow {
        struct dscow_disk_header header;

        uint64_t blocks;
        uint32_t *bitmap;
        uint32_t bitmap_count;
        uint32_t *dirty_bitmaps;
        char *base_filename;

        int fd;
        int dirty;
};

This image size is 4096000000 bytes (4.1 GB).

Thank you.

We have a tree on xenbits now. Eventually, we will push an updated
version of the Xen tree with the latest patches integrated directly.

--
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@xxxxxxxxxx

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