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Re: [Xen-devel] [PATCH] Proper use of VMX execution controls MSR.
| To: | "Li, Xin B" <xin.b.li@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] Proper use of VMX execution controls MSR. |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Thu, 29 Mar 2007 10:11:58 +0100 |
| Delivery-date: | Thu, 29 Mar 2007 02:11:01 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] Proper use of VMX execution controls MSR. |
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On 29/3/07 09:37, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote: > if we have the feature support in Xen, we should set the input control > bit, and expect the adjusted value to be 1; > if we don't have the feature support in Xen, we should clear the input > control bit, and expect adjusted value to be 0; > That's meaning the adjusted output is determined by the input control. > So the expression should be "AND (msr_hi XOR msr_lo)". The subsequent AND with msr_hi and the OR with msr_lo has exactly the same effect. So the AND (msr_hi XOR msr_lo) is not incorrect, but it is redundant. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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