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Re: [Xen-devel] [PATCH][HVM] fix migration from NX-capable machine to no
| To: | David Lively <dlively@xxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH][HVM] fix migration from NX-capable machine to non-NX-capable machine |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 28 Sep 2007 08:18:13 +0100 |
| Delivery-date: | Fri, 28 Sep 2007 00:14:02 -0700 |
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| In-reply-to: | <46FC1CD4.6030905@xxxxxxxxxxxxxxx> |
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| Thread-index: | AcgBn7sR+dlabm2SEdyN5AAWy6hiGQ== |
| Thread-topic: | [Xen-devel] [PATCH][HVM] fix migration from NX-capable machine to non-NX-capable machine |
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On 27/9/07 22:12, "David Lively" <dlively@xxxxxxxxxxxxxxx> wrote: > The attached patch (to 3.1.1-rc2) fixes a hypervisor crash that we're > seeing when migrating a HVM guest from a machine that supports the NX > bit to one that doesn't (e.g., because it's disabled in the BIOS). It > keeps the guest copy of EFER "as is", so the guest will see EFER_NX if > it previously set it -- we just won't propagate this EFER bit to a > non-NX-capable host. Actually this issue is very nearly handled by xen-3.1-testing:15064 and xen-unstable:15066. The HVM state load code that sets guest efer should barf on !cpu_has_nx && EFER_NX, just as the wrmsr-handling code does. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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