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[Xen-devel] RE: [PATCH v2] Enable SMEP CPU feature support for XEN hype
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, "keir@xxxxxxx" <keir@xxxxxxx> |
|---|---|
| Subject: | [Xen-devel] RE: [PATCH v2] Enable SMEP CPU feature support for XEN hypervisor |
| From: | "Li, Xin" <xin.li@xxxxxxxxx> |
| Date: | Sun, 5 Jun 2011 16:39:54 +0800 |
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| Acceptlanguage: | zh-CN, en-US |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Sun, 05 Jun 2011 01:40:29 -0700 |
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| Thread-index: | AcwjU0w8vlsr1zIxRuCnN1Lck9yOlQAB+c7A |
| Thread-topic: | [PATCH v2] Enable SMEP CPU feature support for XEN hypervisor |
>I mean, I know we may as well just hide the feature from PV 64b guests >totally. That's obvious. Let's stop talking about PV 64b guests already! The >question is: what to do about PV 32b guests? >Quite obviously we ought to allow 32-bit pv guests to control this for >themselves (and hence see the feature). That needs 1) inject SMEP faults back to the 32-bit pv guest. 2) let the guest see SMEP thru CPUID and config it in CR4 (actually it's already set, but just to let guest see it). Anything else? >Besides that, assuming Xin verified it's working, your latest patch >looks great to me. Yeah, verified, the system crashed from a SMEP fault from 64-bit pv kernel. Thanks! -Xin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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