Re: [Xen-devel] 64-bit failsafe callback

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27 Mar 2006, at 23:46, Nakajima, Jun wrote:

> Frankly I don't think the failsafe callback code is expected to work. I
> did not see failsafe callback triggered in normal cases or did not have
> test cases for that at the initial port. When I actually saw it, it was
> caused by a porting bug in x86-64 XenLinux. If you have a valid case
> where the failsafe callback should handle, we should fix it.
It can be triggered, for example by an application that creates an LDT, 
sets %gs to refer to an entry in the LDT, then zaps that LDT entry.
I wouldn't expect it ever to be triggered in 'normal' operation though. 
But if it's buggy it must be fixed. Fortunately, I think Jan is right 
and it is fixed merely by deleting lines of code. :-)
 -- Keir


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