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Re: [Xen-devel] [PATCH] vmx: last branch recording MSR emulation
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, Xin B Li <xin.b.li@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] vmx: last branch recording MSR emulation |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Thu, 09 Aug 2007 13:49:42 +0100 |
| Delivery-date: | Thu, 09 Aug 2007 05:47:29 -0700 |
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| In-reply-to: | <46BB28E4.76E4.0078.0@xxxxxxxxxx> |
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| Thread-topic: | [Xen-devel] [PATCH] vmx: last branch recording MSR emulation |
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On 9/8/07 13:47, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > Finally, with LBR registers being used in Xen itself (optionally), you'd > expose > hypervisor internal information to HVM's, which is generally considered a > security risk. Well, that's due to the current rather stupid policy of defaulting HVM MSR reads to read the native MSR. MSR handling needs unifying and a big clean up, just like has now happened to the control registers. Same for CPUID (which has a similarly stupid policy to that of MSR reads). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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