RE: [Xen-devel] DomU crash during migration when suspendingsource domain

["Graham, Simon" <Simon.Graham@xxxxxxxxxxx>]

> Are you migrating between unlike boxes? My guess is that the original
> box
> has processors supporting cacheinfo cpuid leaves and the target box
> does
> not. Migrating to older less-capable CPUs is definitely hit-and-miss
> I'm
> afraid. It really is best not to do it!
>

I think this is indeed what is happening -- supporting this is kind of
important for HA/FT - you need to be able to keep the domains running
when upgrading/replacing hardware.

I guess I'm still a tad confused, but presumably the CPU_DEAD processing
is not completely uninitializing the cache info (it seems to me that if
it discarded the cache info and NULL's the pointer in the CPU_DEAD
processing then it should get recreated when the CPU_ONLINE is done -
presumably there is some path where this is not done when it should be.

I'll do some more digging and get back with a proposed fix.
Simon
 

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