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Re: [Xen-devel] implicit grant unmap
| To: | "King, Steven R" <steven.r.king@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] implicit grant unmap |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Tue, 14 Feb 2006 21:28:43 +0000 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 14 Feb 2006 21:42:04 +0000 |
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| In-reply-to: | <44BDAFB888F59F408FAE3CC35AB470410301A899@orsmsx409> |
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On 14 Feb 2006, at 21:07, King, Steven R wrote: I'm contemplating ways to avoid the domain_crash() in mm.c line ~615 without requiring new OS hooks. This crash occurs when the operating system writes a zero to the PTE for a grant mapping without an explicit Xen call to unmap. In hacking around, it seems the problem is this: When the mapping PTEgets squashed, Xen's cleanup_writable_pagetable() has no way to find thecorrect maptrack entry for the affected mapping. Consequently, the grant mapping is not properly cleaned-up. Sound correct? Are there worse problems here? That's right. That grant will hang around until the domain is destroyed, at which point the grant is cleaned up by gnttab_release_mappings(). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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