Re: [PATCH v2] target/i386: seg_helper: Correct segement selector nullification in the RET/IRET helper

[Paolo Bonzini]

On 13/11/20 11:23, Bin Meng wrote:
> > It would be nicer if the commit message explained how
> > the guest can notice the difference.
>
> The commit message says "Per the SDM" :) The actual failure case
> involves a special code sequence that is exposed in VxWorks guest
> testing. Linux does not expose this however.

I see.  Is there any chance you could write a testcase for 
kvm-unit-tests?  Or just explain how to write such a test, and then I 
can write it myself; it's not clear to me how the guest can observe the 
base and limit of a non-present segment.

Paolo