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Re: [Xen-devel] Why "Mask cmpxchg8b capability in cpuid for non-pae gues
| To: | "Cui, Dexuan" <dexuan.cui@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, <Tim.Deegan@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Why "Mask cmpxchg8b capability in cpuid for non-pae guests"? |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 28 Dec 2006 10:02:49 +0000 |
| Cc: | "Huang, Xinmei" <xinmei.huang@xxxxxxxxx> |
| Delivery-date: | Thu, 28 Dec 2006 02:02:35 -0800 |
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| Thread-topic: | [Xen-devel] Why "Mask cmpxchg8b capability in cpuid for non-pae guests"? |
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On 28/12/06 9:55 am, "Cui, Dexuan" <dexuan.cui@xxxxxxxxx> wrote: > I noticed you "Mask cmpxchg8b capability in cpuid for non-pae guests" in > changeset 13107/13108: clear_bit(X86_FEATURE_CX8 & 31, edx). May I know > the reason for the change? It's needed to successfully install NT4, which has a bug in older service packs where it barfs on the CMPXCHG8B feature bit in CPUID. The right 'fix' is to allow arbitrary masking of CPUID features in the guest config file. We'll revert this workaround. Thanks, Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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