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[Xen-devel] CR4.TSD in guest kernel vs userland
| To: | "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] CR4.TSD in guest kernel vs userland |
| 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 |
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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 |
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