Re: [Xen-devel] SVM/VMX and Interrupt Shadows

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.12.16 at 20:24, <andrew.cooper3@xxxxxxxxxx> wrote:
> Experimentally, on both Intel and AMD hardware, the mov_ss shadow
> inhibits #DB and the VMexit caused by its interception, whereas the sti
> shadow doesn't inhibit #DB.  Therefore, my planned fix for VT-x is to
> unconditionally clobber the sti shadow if we intercept #DB.

I take it you mean "if we intercept #DB and would be about to
deliver such an exception". But see also my reply to Kevin - it
looks as if us not updating GUEST_PENDING_DBG_EXCEPTIONS
might be the problem here.

Jan


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