[Bug 65561] KVM:Entry failed on Single stepping sti instruction

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=65561

--- Comment #28 from Paolo Bonzini <bonzini@gnu.org> ---
As Jatin said, most of the time the emulator is not invoked for instructions
that require intervention of the hypervisor.  Instead, the processor provides
enough "pre-decoded" information about the instruction, so KVM doesn't need to
do it all again in the emulator.

Instructions that invoke the emulator are those that invoke ports or
memory-mapped devices.  However "out" is a fast path, so it doesn't invoke the
emulator.  You see it all the time because the kernel uses it to interact with
many devices (such as the keyboard controller, disk controller or network
cards).

I suggest that you try reproducing the problem with "sti".   The one with "out"
is known and documented in the source code.

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