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[Xen-devel] [PATCH] fix memory exchange hypercall.
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-devel] [PATCH] fix memory exchange hypercall. |
| From: | Isaku Yamahata <yamahata@xxxxxxxxxxxxx> |
| Date: | Thu, 15 Mar 2007 18:53:05 +0900 |
| Cc: | xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 15 Mar 2007 02:53:02 -0700 |
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This patch fixes memory exchange hypercall which has been broken on ia64. Especially the error recovery path. Dropping _PGC_allocated bit and guest_physmap_remove_page() must be done before stealing page because The ia64 p2m table increments page refcount and guest_physmap_remove_page() behaves depending on _PGC_allocated. So far there is work around code in ia64, however the c/s 13366:ed73ff8440d8 of xen-unstable.hg revealed that the work around is broken. The c/s passes dma bit argument of memory exchange so that it results in hypercall error. On x86 platform, memory_exchange() is used only for paravirtualized domain and guest_physmap_remove_page() and guest_phsymap_add_page() are nop for paravirtualized domain. So reordering them is safe. -- yamahata
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