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Re: [Xen-devel] [PATCH][VT] No DISALLOW pte bit check for VMX domain
| To: | "Li, Chengyuan" <chengyuan.li@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH][VT] No DISALLOW pte bit check for VMX domain |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 12 Sep 2005 15:15:19 +0100 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Mon, 12 Sep 2005 14:08:24 +0000 |
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| In-reply-to: | <59D45D057E9702469E5775CBB56411F165A32D@pdsmsx406> |
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On 12 Sep 2005, at 14:55, Li, Chengyuan wrote: You are right. For VMX guest, we need care PAT bit, though we needn't care GLOBAL bit. Not sure what you mean -- maybe that the GLOBAL bit is ignored in guest VMCS, or that global entries are automatically flushed when transitioning? Well, for now I would just apply the DISALLOW_MASK before calling get_page_from_l1e. Missing the global bit cannot harm performance since we need to transition into Xen (and hence flush global entries) when the guest switches its %cr3 anyway. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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