Re: [Xen-devel] [semi-urgent Xen CS question] Re: git commit 9fd67b4ed0714ab718f1f9bd14c344af336a6df7 (x86-64: Give vvars their own page) breaks Xen PV guests (64-bit).

[Andrew Lutomirski <luto@xxxxxxx>]

On Tue, Jul 26, 2011 at 7:37 PM, j.fitz.inge@xxxxxxxxx <jeremy@xxxxxxxx> wrote:
> The correct fix is to just look at the cpl in cs and ignore the rest of the
> selector.

No.  All three of these code paths are trap handlers that are trying
to distinguish between 64-bit and 32-bit segments.  The CPL is 3 in
either case.

It looks like the reason I didn't find the code that it references
TRAP_syscall not VCGF_in_syscall.  Yay for grep-unfriendly code.

Barring a better idea, I'll implement a new paravirt op.

--Andy

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