[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Xen-devel] CR4.TSD in guest kernel vs userland

To: "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Mon, 21 Sep 2009 15:49:45 -0700 (PDT)
Cc: Jan Beulich <JBeulich@xxxxxxxxxx>
Delivery-date: Mon, 21 Sep 2009 15:50:15 -0700
List-id: Xen developer discussion <xen-devel.lists.xensource.com>

I was fretting about the overhead of emulating TSC in
guest kernels.  Is it possible (and relatively inexpensive)
to change CR4.TSD on every transition between guest
kernel and userland?  I suspect not, but thought
I'd check.  If so, what about HVM vs PV and 32-bit
vs 64-bit guest.

Thanks,
Dan

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

Follow-Ups:
- Re: [Xen-devel] CR4.TSD in guest kernel vs userland
  - From: Keir Fraser

Prev by Date: RE: [Xen-devel] rdtscP and xen (and maybe the app-tsc answer I've been looking for)
Next by Date: Re: [Xen-devel] rdtscP and xen (and maybe the app-tsc answer I've been looking for)
Previous by thread: [Xen-devel] [GIT PULL] xen: Check NX state before setting up GDT mapping
Next by thread: Re: [Xen-devel] CR4.TSD in guest kernel vs userland
Index(es):
- Date
- Thread

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.