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Re: [Xen-devel] [PATCH] Implement rdtscp emulation and rdtscp_aux "suppo
| To: | Jan Beulich <JBeulich@xxxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Implement rdtscp emulation and rdtscp_aux "support" |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Thu, 26 Nov 2009 09:31:36 +0000 |
| Cc: | |
| Delivery-date: | Thu, 26 Nov 2009 01:32:02 -0800 |
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| Thread-topic: | [Xen-devel] [PATCH] Implement rdtscp emulation and rdtscp_aux "support" |
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On 26/11/2009 08:15, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote: > I realize that my comment really applies to your earlier patch introducing > rdtsc emulation, but somehow that aspect slipped my attention back > then: Linux has, as a security option, a mechanism to disable rdtsc for > apps, but your emulation code doesn't honor the guest setting of > CR4.TSD. I'll fix this. While I'm at it, I think our PV emulation of MOV CR4,reg is broken -- should just return v->arch.guest_context.ctrlreg[4], would you agree? Otherwise guest's CR4.TSD isn't returned. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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