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Re: [Xen-devel] Re: [PATCH] Xen Guest Kexec

On 3 Mar 2006, at 09:14, Keir Fraser wrote:

Well, the trick I described is good for at least 'non-exceptions' (i.e., it'll disable 'int x' software interrupts). For exceptions, I guess you should simply avoid causing them? :-)

In fact, why not install a dummy handler for all vectors (0-255). That is, a valid cs:eip that vectors to a small kexec function to print the state you desire? Setting flags==0 will ensure that softints don't work, but you can print out a useful message if you take a fault. You could try and put in a safe-ish place so it continues to work even for the early stages of the new kernel boot.

Actually a clear-trap-table call is quite easy to add: I checked in a patch that will clear the entire trap table if you pass a NULL pointer to the set_trap_table hypercall. With that patch in place, if you take a fault you will get a register dump in Xen as desired.

Changeset 9109:29f8c87...

 -- Keir

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