All of lore.kernel.org
 help / color / mirror / Atom feed
From: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
To: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Cc: Paul.Durrant@citrix.com
Subject: Detecting PV drivers
Date: Thu, 4 Apr 2013 17:30:42 +0100	[thread overview]
Message-ID: <515DAAB2.5050107@eu.citrix.com> (raw)

Hi,

I'm trying find out the best way of detecting whether PV drivers have 
loaded in an HVM guest. For example, this is so we can decide whether or 
not to wait for a response from the guest when suspending.

I think the best way of doing this is to find out whether the hypercall 
page has been populated or not, as this is the first thing that any PV 
drivers will have to do, but I don't know how to detect this, or even if 
this is possible - is there any way of finding this out?

At the moment we're currently thinking of looking at status of the 
callback IRQ, which is the second thing that the Citrix PV drivers 
currently do, but I'm not sure about any other drivers. Would this be a 
reasonable thing to do if we can't detect the hypercall page?

Cheers,

Jon

             reply	other threads:[~2013-04-04 16:30 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-04-04 16:30 Jon Ludlam [this message]
2013-04-04 17:00 ` Detecting PV drivers Andrew Cooper
2013-04-05  8:53   ` Jan Beulich
2013-04-05  9:01     ` Paul Durrant
2013-04-05  1:01 ` James Harper
2013-04-05 10:14 ` Stefano Stabellini
2013-04-05 17:16   ` Jonathan Ludlam

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=515DAAB2.5050107@eu.citrix.com \
    --to=jonathan.ludlam@eu.citrix.com \
    --cc=Paul.Durrant@citrix.com \
    --cc=xen-devel@lists.xen.org \
    /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.