On Mon, Jan 30, 2012 at 09:48:33AM +0100, Kevin Wolf wrote:
> Am 27.01.2012 20:52, schrieb Gleb Natapov:
> > On Fri, Jan 27, 2012 at 08:23:33PM +0100, Kevin Wolf wrote:
> >> I believe this should work with both VMX and SVM now. Gleb, Jörg, can one
> >> of
> >> you test this with SVM? I did some testing on my buggy processor and it
> >> looks
> >> as good as it gets, but it would be better if you could confirm.
> >>
> > You forgot to set cpl to 3 in vmcb in svm_set_rflags() when vm86 is
> > enabled, no?
>
> SVM updates the CPL when the segment selector for CS is loaded. From a
> svm.c POV, segment selectors are updated immediately after set_rflags,
> so it wouldn't really make a difference to do it twice.
>
It is too subtle to rely on that. The fact is that checking cpl after
set_rflags provides incorrect value. This better be fixed. BTW does
load_state_from_tss16() need the same fix?
--
Gleb.
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