On Sat, May 4, 2019 at 1:12 PM Andy Lutomirski <[email protected]> wrote:
>
> As an aside, is it even *possible* to get #BP from v8086 mode? On a quick
> SDM read, the INT3 instruction causes #GP if VM=1 and IOPL<3. And, if we
> allow vm86() to have IOPL=3, we should just remove that ability. It’s nuts.
Oh, and I think you mis-read the SDM.
Yes, iopl matters for "int X" (cd xx) instruction in vm86 mode.
But no, iopl does *not* matter for the special "int3/into/int1"
(cc/ce/f1) instructions, I think.
Linus
