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Re: [Xen-users] "Bad type" when setting PML4 on x86_64
| To: | xen-users@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | Re: [Xen-users] "Bad type" when setting PML4 on x86_64 |
| From: | Trammell Hudson <hudson@xxxxxxxxxxxxxx> |
| Date: | Sun, 10 Jun 2007 15:27:24 -0400 |
| Delivery-date: | Sun, 10 Jun 2007 12:25:41 -0700 |
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| In-reply-to: | <200706062027.11702.mark.williamson@xxxxxxxxxxxx> |
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| References: | <20070606114920.GD16548@xxxxxxxxxxxxxx> <200706062027.11702.mark.williamson@xxxxxxxxxxxx> |
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| User-agent: | Mutt/1.5.10i |
> > [...] According to the interface > > guide "a guest OS may always create readable mappings of its own > > memory regardless of its current type", so it would seem that this > > should be an acceptable situation for Xen. > > Make sure that the page is not mapped writable in *any* validated pagetable. > I.e. on any pagetable you've pinned, even if it's not active, on the > pagetable you're switching to and possibly on the pagetable you're > switching /from/ too. Ah, that seems to have been the secret! I made an explicit call to update_va_mapping() for the PML4 virtual address before setting the CR3 and it now complains about the next page. Thanks, Mark! -- Trammell _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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