On 10/12/2012 08:40 AM, Zhang Yanfei wrote: > Currently, kdump just makes all the logical processors leave VMX operation by > executing VMXOFF instruction, so any VMCSs active on the logical processors may > be corrupted. But, sometimes, we need the VMCSs to debug guest images contained > in the host vmcore. To prevent the corruption, we should VMCLEAR the VMCSs before > executing the VMXOFF instruction. How have you verified that VMXOFF doesn't flush cached VMCSs already? > > The patch set provides an alternative way to clear VMCSs related to guests > on all cpus when host is doing kdump. > I'm not sure the sysctl is really necessary. The only reason to turn if off is if the corruption is so severe that the loaded vmcs list itself causes a crash. I think it should be rare enough that we can do it unconditionally. -- error compiling committee.c: too many arguments to function
