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Re: [Xen-devel] [PATCH] x86_64 trap table fixup
| To: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86_64 trap table fixup |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 4 Jul 2005 09:11:40 +0100 |
| Cc: | chrisw@xxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 04 Jul 2005 08:06:26 +0000 |
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On 4 Jul 2005, at 08:46, Jan Beulich wrote: One remark since this code is getting touched now anyway: You appear to have taken the same (somewhat broken) approach of handling #BR as Linux does. Architecturally, IDT entry 5 should be a DPL=0 one (permitting BOUND, but disallowing INT 05); is there any particular reason you want to allow INT 05 here (which could get you in conflict with hostingWindows, which appears to deal with this the architecture intended way)? The guest OS is allowed to set the DPL as it wants -- in the case of xenlinux we want to retain maximum compatibility with native Linux. Other paravirtualised OSes can set the DPL to zero if they wish. In the case of Windows, that will only run on VT/SVM hardware anyway, and that deals with handling the guest's IDT pretty much automatically, so these paravirtual interfaces aren;t used at all. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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