All of lore.kernel.org
 help / color / mirror / Atom feed
From: Wei Liu <liuw@liuw.name>
To: Daniel Castro <evil.dani@gmail.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: Block front and back connection
Date: Tue, 9 Aug 2011 10:27:55 +0800	[thread overview]
Message-ID: <20110809022755.GA1783@limbo> (raw)
In-Reply-To: <CAP2B85_YZFqLWSqOMJv9wg1_3L7aHMgdrdAfeKbrqb0HHuiYOw@mail.gmail.com>

On Mon, Aug 08, 2011 at 11:17:52PM +0900, Daniel Castro wrote:
> Hello,
> 
> I am trying to make my frontend block driver connect to xen block
> backend. I have the ring and gref, yet I do not know where in xenstore
> should I write the keys to tell the backend to connect to my frontend.
> 

You can find some clues in libxl_devices.c .

The frontend path is

/local/domain/FRONTEND_DOMID/device/DEVICE_KIND/DEVID

The backend path is

/local/domain/BACKEND_DOMID/backend/BACKEND_KIND/FRONTEND_DOMID/DEVID

Often the BACKEND_DOMID is 0.

And looking into Linux kernel's xen-{blkfront,blkback} helps you a
lot.

Then you can switch xenbus state after proper values are in place, so
that frontend and backend can connect to each other.

Wei.

  parent reply	other threads:[~2011-08-09  2:27 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-08 14:17 Block front and back connection Daniel Castro
2011-08-08 17:38 ` Pasi Kärkkäinen
2011-08-08 23:26   ` Reporting some xen 4.1.2* and 4.0 issues like limitations to 4 VCPUs for debian squeeze HVMs etc Mark Schneider
2011-08-09  0:55     ` Pasi Kärkkäinen
2011-08-09 21:05       ` Mark Schneider
2011-08-13 18:39         ` Pasi Kärkkäinen
2011-08-13 19:09           ` Reporting some xen 4.1.2* issues like limitations to 4 VCPUs for debian squeeze HVMs Mark Schneider
2011-08-23 17:57             ` Stefano Stabellini
2011-08-23 17:55               ` Pasi Kärkkäinen
2011-08-23 18:10                 ` Stefano Stabellini
2011-08-23 18:45                   ` Pasi Kärkkäinen
2011-08-23 18:54                     ` Stefano Stabellini
2011-08-24 21:02             ` Konrad Rzeszutek Wilk
2011-08-25 20:09               ` Mark Schneider
2011-08-26 12:19                 ` Stefano Stabellini
2011-08-09  2:27 ` Wei Liu [this message]
2011-08-09  8:38   ` Block front and back connection Daniel Castro

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20110809022755.GA1783@limbo \
    --to=liuw@liuw.name \
    --cc=evil.dani@gmail.com \
    --cc=xen-devel@lists.xensource.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.