Messages in this thread | | | Date | Thu, 04 Aug 2011 18:20:53 +0200 | From | Olaf Hering <> | Subject | [PATCH 0/3] [v4] kexec and kdump for Xen PVonHVM guests |
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The following series implements kexec and kdump in a Xen PVonHVM guest.
It is (should be) available via git:
git://github.com/olafhering/linux.git xen-kexec-3.0
The kexec or kdump kernel has to take care of already allocated virqs, PV devices in Closed or Connected state, and of registered watches in the old kernel. With the three patches these conditions are checked during boot of the new kernel rather than in the reboot/crash path.
A fixed kexec-tools-2.0.2 package is required: http://lists.infradead.org/pipermail/kexec/2011-May/005026.html http://lists.infradead.org/pipermail/kexec/2011-August/005339.html
Another fix is for xenstored, it has to accept the XS_INTRODUCE from a guest: http://lists.xensource.com/archives/html/xen-devel/2011-08/msg00007.html
One open issue is the balloon driver. It removes pages from the guest and gives them back to the hypervisor. The kexec kernel is not aware of the fact that some pages are unavailable, and hangs or crashes. The workaround for the time being is:
if test -f /sys/devices/system/xen_memory/xen_memory0/target -a \ -f /sys/devices/system/xen_memory/xen_memory0/target_kb then cat /sys/devices/system/xen_memory/xen_memory0/target > \ /sys/devices/system/xen_memory/xen_memory0/target_kb fi kexec -e
This has to be resolved with another series of changes.
Olaf
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