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[Xen-devel] xenstore index reset in xb_init_comms breaks domU kdump
| To: | Keir Fraser <keir@xxxxxxx> |
|---|---|
| Subject: | [Xen-devel] xenstore index reset in xb_init_comms breaks domU kdump |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Wed, 26 Jan 2011 15:00:44 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 26 Jan 2011 06:01:59 -0800 |
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Keir, in the commit below a reset of the rsp_cons/rsp_prod index was added. http://xenbits.xen.org/staging/xen-unstable.hg?rev/1ec0d322402e Is this reset really required for save/restore? I have not tried it, but I would assume a restored guest would get an empty page to work with. Also: Could a guest be saved when its in the middle of a xenstore operation? The reset breaks the xenstore interface in a crashed domU kernel. If the crash kernel boots, it tries to operate on the new rsp_* index. But this contains garbage, process_msg() tries to use the data as 'struct xsd_sockmsg', and kmalloc() fails. If I remove the rsp_cons/rsp_prod reset in xb_init_comms(), the PV drivers in the crash kernel can connect to xenstore. Should the fixup code be removed, or is it essential for save/restore? Olaf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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