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[Xen-devel] Re: [PATCH v3] xen/hvm: add kexec/kdump support
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] Re: [PATCH v3] xen/hvm: add kexec/kdump support |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Mon, 1 Aug 2011 15:28:19 +0200 |
| Delivery-date: | Mon, 01 Aug 2011 06:29:59 -0700 |
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| User-agent: | Mutt/1.5.21.rev5535 (2011-07-01) |
On Mon, Aug 01, Olaf Hering wrote: > - add xs_introduce() in xs_init() to shutdown all open watches that the > previous kernel had registered. Without this change the kexec may > crash due to unexpected watch events. > This depends on a xenstored change which has to allow the XS_INTRODUCE > from a guest. > And this part may need more work because the xs_introduce may hang > forever on an old dom0 tool stack The hang I encountered last week was due to a bug in the new xs_introduce() function. "iov[2].iov_len" was by accident written as "iov[3].iov_len", which left the iov_len uninitialized. Then xenstored got a huge iov_len, returned an error which the kernel received. But the process_msg() did not wakeup read_reply() for some reason. Today an unmodified sles11sp1 dom0 can boot a 3.0 kernel with the kexec/kdump patch applied. Olaf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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