jonkery huang
2008-Jul-22 09:35 UTC
[Xen-devel] Redhat enterprise linux 4 update 7 guest suspend hang
Hi,
I have installed a Redhat EL4U7 HVM guest, then issue xm suspend, the
command will hang at xc_save:
1. # ps aux
......
root 16761 0.1 0.9 11264 5984 pts/9 S+ 14:17 0:00 python
/usr/sbin/xm suspend 41
root 16763 0.0 0.0 1988 480 ? S 14:17 0:00
/usr/lib/xen/bin/xc_save 29 41 0 0 4
# strace -p 16763
Process 16763 attached - interrupt to quit
read(0,
seems it is waiting for something.
2. Check with this guest, it has pv dirver installed:
# xm li
Name ID Mem VCPUs State
Time(s)
Domain-0 0 585 4 r-----
1144.9
OVM_EL4U7_X86_HVM_4GB 40 1024 1
-b---- 82.2
# python
Python 2.4.3 (#1, Jun 6 2007, 15:09:38)
[GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2
Type "help", "copyright", "credits" or
"license" for more information.
>>> import sys
>>> import xen.lowlevel.xc
>>> from xen.xend.XendConstants import *
>>> xc = xen.lowlevel.xc.xc()
>>> hvm_pvdrv = xc.hvm_get_param(40, HVM_PARAM_CALLBACK_IRQ)
>>> if hvm_pvdrv:
... print "This domain has PV drivers"
...
This domain has PV drivers
3. Check with EL4U7 kernel kernel-2.6.9-70.0.0.0.1.EL,
HVM_PARAM_CALLBACK_IRQ is set when init platform-pci which is built in
to the kernel.
4. For hvm guest with pv driver, xend will deal with it in a special
way, paste some code from tools/python/xen/xend/XendDomainInfo.py
# HVM domain shuts itself down only if it has PV drivers
if self.info.is_hvm():
hvm_pvdrv = xc.hvm_get_param(self.domid, HVM_PARAM_CALLBACK_IRQ)
if not hvm_pvdrv:
code = REVERSE_DOMAIN_SHUTDOWN_REASONS[reason]
log.info("HVM save:remote shutdown dom %d!",
self.domid)
xc.domain_shutdown(self.domid, code)
In the comment, it says "HVM domain shuts itself down only if it has PV
drivers", what does this mean? how to shutdown a HVM guest with pv driver?
--
Thanks
Jonkery
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