Re: xenstore documentation

[Anthony Liguori <aliguori@us.ibm.com>]

Jacob Gorm Hansen wrote:

>Sorry about that too, whoever dreamed this whole thing up has not been
>able to answer my increasingly desperate cries for help recently, and
>I am a little frustrated with the amount of time I have spent just
>getting a simple block device attached.
>  
>
1) Create domain
    domid = 0
    xc_domain_create(&domid)
    xc_domain_maxmem(domid, memory >> 10);
    xc_domain_memory_increase_reservation(domid, memory >> 12);

2) Build domain
    lconsole = rconsole = 0;
    xc_evtchn_bind_interdomain(0, domid, &lconsole, &rconsole);
    lstore = rstore = 0;
    xc_evtchn_bind_interdomain(0, domid, &lconsole, &rconsole);

    xc_linux_build(domid, kernel, ramdisk, cmdline, 0, vcpus, rstore, 
&mfn_store, rconsole, &mfn_console)
    home = "/tools/<yourtool>/domain/%d" % domid
    xs_domain_introduce(domid, mfn_store, lstore, home);
    xs_write(home + "/console/ring-ref", mfn_console)
    xs_write(home + "/console/port", lconsole)

3) Create block device (pdev, vdev)
    static int uuid;

    dom0_home = xs_get_domain_path(0)

    backend = dom0_home + "/backend/vbd/%s/%s' % (uuid, domid)
    frontend = home + "/device/vbd/%s' % uuid

    transaction_start()
    xs_write(backend + "/frontend", frontend);
    xs_write(backend + "/frontend-id", domid);
    transaction_end()

    transaction_start()
    xs_write(frontend + "/backend", backend);
    xs_write(frontend + "/backend-id", 0);
    xs_write(frontend + "/virtual-device", vdev)
    transaction_end()

    xs_write(backend + "/physical-device", pdev)

This might seem complicated, but compared to what you had to do under 
2.0.x, it's a 1000x times easier.

Regards,

Anthony Liguori

>Jacob
>
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>